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1,536 | hey what's up guys john here again and this time i want to talk about uh this week's one of the contest problems in this week's uh weekly contest uh number 1536 minimum swaps to a range a binary grade and so you're given like an times n by n binary 2d grade binary grade means there could be only zero or one in each cel... | Minimum Swaps to Arrange a Binary Grid | customers-who-bought-products-a-and-b-but-not-c | Given an `n x n` binary `grid`, in one step you can choose two **adjacent rows** of the grid and swap them.
A grid is said to be **valid** if all the cells above the main diagonal are **zeros**.
Return _the minimum number of steps_ needed to make the grid valid, or **\-1** if the grid cannot be valid.
The main diago... | null | Database | Medium | null |
93 | this is expert fund and you are watching on YouTube so today we are going to see the lead code question so let's begin from here okay let's read the question so we have given today uh 93 question number and it is saying restore IP address and we'll do through the Java solution okay so let's read the question here a val... | Restore IP Addresses | restore-ip-addresses | A **valid IP address** consists of exactly four integers separated by single dots. Each integer is between `0` and `255` (**inclusive**) and cannot have leading zeros.
* For example, `"0.1.2.201 "` and `"192.168.1.1 "` are **valid** IP addresses, but `"0.011.255.245 "`, `"192.168.1.312 "` and `"192.168@1.1 "` are **... | null | String,Backtracking | Medium | 752 |
43 | Ajay hai 101 senior members setting of the number in this the number is 010 tight so acidity and offs condition after the attack on that I am coming SIM taking strong bir vighn hai the match will need just reverse close your number hai ki a ke Well appointing where possible but ever the length of this two number office... | Multiply Strings | multiply-strings | Given two non-negative integers `num1` and `num2` represented as strings, return the product of `num1` and `num2`, also represented as a string.
**Note:** You must not use any built-in BigInteger library or convert the inputs to integer directly.
**Example 1:**
**Input:** num1 = "2", num2 = "3"
**Output:** "6"
**Ex... | null | Math,String,Simulation | Medium | 2,66,67,415 |
1,366 | are we live over live man I have not live streamed ages but I'm back on YouTube now this is gonna be like a long time I just got back from Jiu Jitsu so I'm really tired from martial arts class but we're gonna do a lead code problem today and I know there's like three of my favorite YouTubers are live streaming right no... | Rank Teams by Votes | first-unique-number | In a special ranking system, each voter gives a rank from highest to lowest to all teams participating in the competition.
The ordering of teams is decided by who received the most position-one votes. If two or more teams tie in the first position, we consider the second position to resolve the conflict, if they tie a... | Use doubly Linked list with hashmap of pointers to linked list nodes. add unique number to the linked list. When add is called check if the added number is unique then it have to be added to the linked list and if it is repeated remove it from the linked list if exists. When showFirstUnique is called retrieve the head ... | Array,Hash Table,Design,Queue,Data Stream | Medium | null |
215 | Are Hello Guys Desi Interview Failed What This Site Today They Are Going To Discuss Against Just Element In Are From Dalit Code 14 Problems Give Like Every Year Provide Twitter Interior A Contingent Passes And Were Supposed To Find The Largest Element In That Is The Solid 121 Tolerable First President In The Means The ... | Kth Largest Element in an Array | kth-largest-element-in-an-array | Given an integer array `nums` and an integer `k`, return _the_ `kth` _largest element in the array_.
Note that it is the `kth` largest element in the sorted order, not the `kth` distinct element.
You must solve it in `O(n)` time complexity.
**Example 1:**
**Input:** nums = \[3,2,1,5,6,4\], k = 2
**Output:** 5
**Ex... | null | Array,Divide and Conquer,Sorting,Heap (Priority Queue),Quickselect | Medium | 324,347,414,789,1014,2113,2204,2250 |
938 | a tree is an amazing data structure each node can have any number of children however the most commonly used tree data structure is a binary tree where each node can only have two children that is with the term binary right and then we have a more specific case that is the binary search tree where the left node is smal... | Range Sum of BST | numbers-at-most-n-given-digit-set | Given the `root` node of a binary search tree and two integers `low` and `high`, return _the sum of values of all nodes with a value in the **inclusive** range_ `[low, high]`.
**Example 1:**
**Input:** root = \[10,5,15,3,7,null,18\], low = 7, high = 15
**Output:** 32
**Explanation:** Nodes 7, 10, and 15 are in the ra... | null | Array,Math,Binary Search,Dynamic Programming | Hard | null |
923 | That's what guys welcome back to my channel and you will go into them with multiple cities so what is the giver statement here given in tears are dependent and get it is the number of tapple IG thing that I close bank of dark eyes places paste target answer Can they release its models in switch problem what an agent an... | 3Sum With Multiplicity | super-egg-drop | Given an integer array `arr`, and an integer `target`, return the number of tuples `i, j, k` such that `i < j < k` and `arr[i] + arr[j] + arr[k] == target`.
As the answer can be very large, return it **modulo** `109 + 7`.
**Example 1:**
**Input:** arr = \[1,1,2,2,3,3,4,4,5,5\], target = 8
**Output:** 20
**Explanatio... | null | Math,Binary Search,Dynamic Programming | Hard | 2031 |
94 | 200 World Preferred Videos Special About Binary Tree Inorder Traversal Swift Coding Let's See What is Inorder Traversal of Military Forces Parenting Children Deposit Flats In More Loot Subscribe Must Subscribe Channel Now To Receive New Updates Notice 30 Printed Android 2.2 Updates Notice 30 Printed Android 2.2 Updates... | Binary Tree Inorder Traversal | binary-tree-inorder-traversal | Given the `root` of a binary tree, return _the inorder traversal of its nodes' values_.
**Example 1:**
**Input:** root = \[1,null,2,3\]
**Output:** \[1,3,2\]
**Example 2:**
**Input:** root = \[\]
**Output:** \[\]
**Example 3:**
**Input:** root = \[1\]
**Output:** \[1\]
**Constraints:**
* The number of nodes i... | null | Stack,Tree,Depth-First Search,Binary Tree | Easy | 98,144,145,173,230,272,285,758,799 |
343 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem integer break i saw some people on my discord were working on this problem and i realized i didn't have a video solution for it so here we go we're given an integer n and we want to break it up into a bunch of positive ... | Integer Break | integer-break | Given an integer `n`, break it into the sum of `k` **positive integers**, where `k >= 2`, and maximize the product of those integers.
Return _the maximum product you can get_.
**Example 1:**
**Input:** n = 2
**Output:** 1
**Explanation:** 2 = 1 + 1, 1 \* 1 = 1.
**Example 2:**
**Input:** n = 10
**Output:** 36
**Exp... | There is a simple O(n) solution to this problem. You may check the breaking results of n ranging from 7 to 10 to discover the regularities. | Math,Dynamic Programming | Medium | 1936 |
167 | all right I think we're recording so hey how's it going guys Nick white here I do tech and coding stuff on Twitch on YouTube you want to see you to check the description right now I'm doing elite code series where I just solve and explain all of the problems and YouTube videos so if you want to check out any other prob... | Two Sum II - Input Array Is Sorted | two-sum-ii-input-array-is-sorted | Given a **1-indexed** array of integers `numbers` that is already **_sorted in non-decreasing order_**, find two numbers such that they add up to a specific `target` number. Let these two numbers be `numbers[index1]` and `numbers[index2]` where `1 <= index1 < index2 <= numbers.length`.
Return _the indices of the two n... | null | Array,Two Pointers,Binary Search | Medium | 1,653,1083 |
561 | hello welcome to my channel i'm here to do my 100 legal challenge today we have leeco 561 array partition 1 so given an integer array nums of 2n integer groups this integers into n pairs which is a 1 b 1 a 2 b 2 all the way to a n b n such that the sum of the mean a i b i uh for all i is maximized so return the maximiz... | Array Partition | array-partition-i | Given an integer array `nums` of `2n` integers, group these integers into `n` pairs `(a1, b1), (a2, b2), ..., (an, bn)` such that the sum of `min(ai, bi)` for all `i` is **maximized**. Return _the maximized sum_.
**Example 1:**
**Input:** nums = \[1,4,3,2\]
**Output:** 4
**Explanation:** All possible pairings (ignori... | Obviously, brute force won't help here. Think of something else, take some example like 1,2,3,4. How will you make pairs to get the result? There must be some pattern. Did you observe that- Minimum element gets add into the result in sacrifice of maximum element. Still won't able to find pairs? Sort the array and try t... | Array,Greedy,Sorting,Counting Sort | Easy | 2112,2248,2261 |
1,568 | hey guys today we're going to solve lead code number 1568 it was featured in today's contest it was the third problem so we're given a 2d grid of ones and zeros the ones represent land and the zeros represent water and an island is a four directionally connected group of ones this is extremely important we cannot go di... | Minimum Number of Days to Disconnect Island | pseudo-palindromic-paths-in-a-binary-tree | You are given an `m x n` binary grid `grid` where `1` represents land and `0` represents water. An **island** is a maximal **4-directionally** (horizontal or vertical) connected group of `1`'s.
The grid is said to be **connected** if we have **exactly one island**, otherwise is said **disconnected**.
In one day, we a... | Note that the node values of a path form a palindrome if at most one digit has an odd frequency (parity). Use a Depth First Search (DFS) keeping the frequency (parity) of the digits. Once you are in a leaf node check if at most one digit has an odd frequency (parity). | Bit Manipulation,Tree,Depth-First Search,Breadth-First Search,Binary Tree | Medium | null |
514 | Maa So Gayi Tujhe Channel Friends, in this video we will explain the freedom problem which is actually a hot problem of liquid but it is a very easy problem in brush, not that, so in this video first of all we will discuss the earth problem and then give an approach to it. We will develop it and then we will follow it,... | Freedom Trail | freedom-trail | In the video game Fallout 4, the quest **"Road to Freedom "** requires players to reach a metal dial called the **"Freedom Trail Ring "** and use the dial to spell a specific keyword to open the door.
Given a string `ring` that represents the code engraved on the outer ring and another string `key` that represents the... | null | String,Dynamic Programming,Depth-First Search,Breadth-First Search | Hard | null |
97 | so the problem is easy to understand but uh it's difficult to do yeah it's really difficult to think about what uploads we can solve it only if you have solved this question before yeah actually this problem is really famous so for the inter living stram it just means we have a Str S1 and S2 so for S1 it has a sequence... | Interleaving String | interleaving-string | Given strings `s1`, `s2`, and `s3`, find whether `s3` is formed by an **interleaving** of `s1` and `s2`.
An **interleaving** of two strings `s` and `t` is a configuration where `s` and `t` are divided into `n` and `m` substrings respectively, such that:
* `s = s1 + s2 + ... + sn`
* `t = t1 + t2 + ... + tm`
* `|... | null | String,Dynamic Programming | Medium | null |
1,710 | Install this software will also be present Question Maximum Grease Electrification So Imperative To Begin From Rohini This Question Is Also Video Made Edit Ok Benefit Maximum Accident Office Louis Mohan Question Post Office Road Work Hai To That Barun Question Problem Hansoge Saunf Baje Singh Who Have Also Into the box... | Maximum Units on a Truck | find-servers-that-handled-most-number-of-requests | You are assigned to put some amount of boxes onto **one truck**. You are given a 2D array `boxTypes`, where `boxTypes[i] = [numberOfBoxesi, numberOfUnitsPerBoxi]`:
* `numberOfBoxesi` is the number of boxes of type `i`.
* `numberOfUnitsPerBoxi` is the number of units in each box of the type `i`.
You are also given... | To speed up the next available server search, keep track of the available servers in a sorted structure such as an ordered set. To determine if a server is available, keep track of the end times for each task in a heap and add the server to the available set once the soonest task ending time is less than or equal to th... | Array,Greedy,Heap (Priority Queue),Ordered Set | Hard | null |
1,048 | hey everybody this is Larry this is day 23 23rd of the Leo day challenge hit the like button hit the Subscribe button join me on Discord let me know what you think about this P today's PR is 1048 longest string chain so okay so word a is a processor of word b if we can insert one letter um to make it B okay so it doesn... | Longest String Chain | clumsy-factorial | You are given an array of `words` where each word consists of lowercase English letters.
`wordA` is a **predecessor** of `wordB` if and only if we can insert **exactly one** letter anywhere in `wordA` **without changing the order of the other characters** to make it equal to `wordB`.
* For example, `"abc "` is a **... | null | Math,Stack,Simulation | Medium | null |
1,791 | Hello hello everyone to index video bihar ko install liquid problem number 0 tiffin center of warcraft so let's go by the problem statement phase starcraft consisting of notes from to and stir with miner daughter with every breath today these celebs to mid return of the day 200ns problem Statement Lecture Star Graph In... | Find Center of Star Graph | richest-customer-wealth | There is an undirected **star** graph consisting of `n` nodes labeled from `1` to `n`. A star graph is a graph where there is one **center** node and **exactly** `n - 1` edges that connect the center node with every other node.
You are given a 2D integer array `edges` where each `edges[i] = [ui, vi]` indicates that th... | Calculate the wealth of each customer Find the maximum element in array. | Array,Matrix | Easy | null |
216 | hey guys welcome back to another video and today we're going to be solving the leakout question combination sum three all right so in this question we're gonna find all the possible combinations of k numbers that add up to a certain number n given that only numbers from one through nine can be used at each combination ... | Combination Sum III | combination-sum-iii | Find all valid combinations of `k` numbers that sum up to `n` such that the following conditions are true:
* Only numbers `1` through `9` are used.
* Each number is used **at most once**.
Return _a list of all possible valid combinations_. The list must not contain the same combination twice, and the combinations... | null | Array,Backtracking | Medium | 39 |
502 | hello everyone welcome to my channel coding together my name is vikas oja today we will see a lead code heart problem IPO so let's read the state problem statement so suppose lead code wants to start its IPO so before the IPO the lead code wants to work on some projects with at most K distinct projects and it wants to ... | IPO | ipo | Suppose LeetCode will start its **IPO** soon. In order to sell a good price of its shares to Venture Capital, LeetCode would like to work on some projects to increase its capital before the **IPO**. Since it has limited resources, it can only finish at most `k` distinct projects before the **IPO**. Help LeetCode design... | null | Array,Greedy,Sorting,Heap (Priority Queue) | Hard | null |
392 | hi and welcome to prototype we will be solving the problem for lead code 392 is subsequence this is another problem in the elite codes 75 study plan uh let's read the description so given two strings s and t return true if s is a subsequence of t or false otherwise and a subsequence of a string is a new string that is ... | Is Subsequence | is-subsequence | Given two strings `s` and `t`, return `true` _if_ `s` _is a **subsequence** of_ `t`_, or_ `false` _otherwise_.
A **subsequence** of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i... | null | Two Pointers,String,Dynamic Programming | Easy | 808,1051 |
161 | friends welcome to followup let's have a look at problem 161 one edit distance in this video we're going to explain a linear solution uh based on linear scam so this problem actually is closely related to problem 72 edit distance uh which can be solved using dynamic programming so here for this problem we just need to ... | One Edit Distance | one-edit-distance | Given two strings `s` and `t`, return `true` if they are both one edit distance apart, otherwise return `false`.
A string `s` is said to be one distance apart from a string `t` if you can:
* Insert **exactly one** character into `s` to get `t`.
* Delete **exactly one** character from `s` to get `t`.
* Replace *... | null | Two Pointers,String | Medium | 72 |
326 | Yes, hello developer, there are 2 rings. Today's professional problem is 3 126 power-up o3. The Today's professional problem is 3 126 power-up o3. The Today's professional problem is 3 126 power-up o3. The inspection animation is given. If this score is the next square number, write a function that returns itself and t... | Power of Three | power-of-three | Given an integer `n`, return _`true` if it is a power of three. Otherwise, return `false`_.
An integer `n` is a power of three, if there exists an integer `x` such that `n == 3x`.
**Example 1:**
**Input:** n = 27
**Output:** true
**Explanation:** 27 = 33
**Example 2:**
**Input:** n = 0
**Output:** false
**Explanat... | null | Math,Recursion | Easy | 231,342,1889 |
807 | hello friends so today we're gonna be looking at problem 807 Italy code there's a medium it's max increased to keep the city skyline so you're given a two-dimensional array every value in two-dimensional array every value in two-dimensional array every value in this 2d array represents the height of a building so you'r... | Max Increase to Keep City Skyline | custom-sort-string | There is a city composed of `n x n` blocks, where each block contains a single building shaped like a vertical square prism. You are given a **0-indexed** `n x n` integer matrix `grid` where `grid[r][c]` represents the **height** of the building located in the block at row `r` and column `c`.
A city's **skyline** is t... | null | Hash Table,String,Sorting | Medium | null |
1,636 | hey there welcome back to lead coding this is the problem number one of lead code by weekly contest 38 the solutions to other three problems have already been uploaded the name of the problem is sort array by increasing frequency so we are given an array of numbers and each number will have certain frequency in that ar... | Sort Array by Increasing Frequency | number-of-substrings-with-only-1s | Given an array of integers `nums`, sort the array in **increasing** order based on the frequency of the values. If multiple values have the same frequency, sort them in **decreasing** order.
Return the _sorted array_.
**Example 1:**
**Input:** nums = \[1,1,2,2,2,3\]
**Output:** \[3,1,1,2,2,2\]
**Explanation:** '3' h... | Count number of 1s in each consecutive-1 group. For a group with n consecutive 1s, the total contribution of it to the final answer is (n + 1) * n // 2. | Math,String | Medium | 1885,2186 |
867 | Hello everyone welcome to my channel code sir with mike so today we are going to do question number video number six of our lead code is playlist okay lead code is 867 easy marked it is a very easy question and we will understand it very clearly and details I will understand. Many companies have asked this question. Le... | Transpose Matrix | new-21-game | Given a 2D integer array `matrix`, return _the **transpose** of_ `matrix`.
The **transpose** of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices.
**Example 1:**
**Input:** matrix = \[\[1,2,3\],\[4,5,6\],\[7,8,9\]\]
**Output:** \[\[1,4,7\],\[2,5,8\],\[3,6,9\]\]
**E... | null | Math,Dynamic Programming,Sliding Window,Probability and Statistics | Medium | null |
354 | in this video lecture we will be solving this problem Russian doll envelopes which is a lead code hard problem in this problem we are given a 2d array of integers envelopes where each element in this array contains a pair representing the width and height of the envelope one envelope can fit into another envelope if an... | Russian Doll Envelopes | russian-doll-envelopes | You are given a 2D array of integers `envelopes` where `envelopes[i] = [wi, hi]` represents the width and the height of an envelope.
One envelope can fit into another if and only if both the width and height of one envelope are greater than the other envelope's width and height.
Return _the maximum number of envelope... | null | Array,Binary Search,Dynamic Programming,Sorting | Hard | 300,2123 |
86 | You guys don't know about Loot or about your suji so friend this is the platform which repairs you old track if you are a working professional or you are a student here but what do you mean these days there is a lot of There are so many hot websites in one movie that you are afraid of losing a job. The cheese seller sa... | Partition List | partition-list | Given the `head` of a linked list and a value `x`, partition it such that all nodes **less than** `x` come before nodes **greater than or equal** to `x`.
You should **preserve** the original relative order of the nodes in each of the two partitions.
**Example 1:**
**Input:** head = \[1,4,3,2,5,2\], x = 3
**Output:**... | null | Linked List,Two Pointers | Medium | 2265 |
11 | hey what's up guys Nick white here do tecnico ting stuff on twitching youtube if you're interested check the description I do all the lis code problems I got a ton of them up so go check those out if you want to explain to you this one we're doing is called container with most water so this is pretty good question you ... | Container With Most Water | container-with-most-water | You are given an integer array `height` of length `n`. There are `n` vertical lines drawn such that the two endpoints of the `ith` line are `(i, 0)` and `(i, height[i])`.
Find two lines that together with the x-axis form a container, such that the container contains the most water.
Return _the maximum amount of water... | The aim is to maximize the area formed between the vertical lines. The area of any container is calculated using the shorter line as length and the distance between the lines as the width of the rectangle.
Area = length of shorter vertical line * distance between lines
We can definitely get the maximum width ... | Array,Two Pointers,Greedy | Medium | 42 |
402 | hello guys welcome back to my channel today's problem is remove K digits which is number 402 from lid code and let's get started so we're given a non-negative integer so we're given a non-negative integer so we're given a non-negative integer num represented as a string we have to remove K digits from the number so tha... | Remove K Digits | remove-k-digits | Given string num representing a non-negative integer `num`, and an integer `k`, return _the smallest possible integer after removing_ `k` _digits from_ `num`.
**Example 1:**
**Input:** num = "1432219 ", k = 3
**Output:** "1219 "
**Explanation:** Remove the three digits 4, 3, and 2 to form the new number 1219 which ... | null | String,Stack,Greedy,Monotonic Stack | Medium | 321,738,1792,2305 |
342 | if there exists an integer X such that n equal to 4 power x so the question is very simple they are given an integer let's say 16. you have to take S at the power of 4 or not it's a powerful square is 16 right uh if you take 20 it's a multiple of four but it's not the power of shape so what is the approach to solve the... | Power of Four | power-of-four | Given an integer `n`, return _`true` if it is a power of four. Otherwise, return `false`_.
An integer `n` is a power of four, if there exists an integer `x` such that `n == 4x`.
**Example 1:**
**Input:** n = 16
**Output:** true
**Example 2:**
**Input:** n = 5
**Output:** false
**Example 3:**
**Input:** n = 1
**O... | null | Math,Bit Manipulation,Recursion | Easy | 231,326 |
784 | hello guys today we are going to discuss the lead code problem later case permutation so this is i think last problem in the backtracking series so let us start this problem so the problem statement is given like we are given a string s and we can transform every character individually to be the lower case or upper cas... | Letter Case Permutation | insert-into-a-binary-search-tree | Given a string `s`, you can transform every letter individually to be lowercase or uppercase to create another string.
Return _a list of all possible strings we could create_. Return the output in **any order**.
**Example 1:**
**Input:** s = "a1b2 "
**Output:** \[ "a1b2 ", "a1B2 ", "A1b2 ", "A1B2 "\]
**Example 2:*... | null | Tree,Binary Search Tree,Binary Tree | Medium | 783 |
144 | a legal problem called binary tree pre-order traversal so we basically pre-order traversal so we basically pre-order traversal so we basically given a tree node right the root of tree node we want to return the pre-order we want to return the pre-order we want to return the pre-order traversal of its nodes value so for... | Binary Tree Preorder Traversal | binary-tree-preorder-traversal | Given the `root` of a binary tree, return _the preorder traversal of its nodes' values_.
**Example 1:**
**Input:** root = \[1,null,2,3\]
**Output:** \[1,2,3\]
**Example 2:**
**Input:** root = \[\]
**Output:** \[\]
**Example 3:**
**Input:** root = \[1\]
**Output:** \[1\]
**Constraints:**
* The number of nodes ... | null | Stack,Tree,Depth-First Search,Binary Tree | Easy | 94,255,775 |
367 | Hello Everyone Let's Challenge All The Merit Today No Any Problems Ballot Perfect Square May Be Your Positive Number Name Is Light Of Function Between Returns Through Is So Clear That Is Square Is Zen In Inventor Library In Third Life But Method And Matter Live In When Same they have in Python and other languages as ... | Valid Perfect Square | valid-perfect-square | Given a positive integer num, return `true` _if_ `num` _is a perfect square or_ `false` _otherwise_.
A **perfect square** is an integer that is the square of an integer. In other words, it is the product of some integer with itself.
You must not use any built-in library function, such as `sqrt`.
**Example 1:**
**In... | null | Math,Binary Search | Easy | 69,633 |
1,512 | let's go over number 1512 number of good pairs given an array of integer numbers a pair is called good if number Z index is equal to na manja index J and I is less than J so we have two conditions that has to be met so first of all as nums that index I is equal to norms index J and second one is I has to be less than J... | Number of Good Pairs | design-underground-system | Given an array of integers `nums`, return _the number of **good pairs**_.
A pair `(i, j)` is called _good_ if `nums[i] == nums[j]` and `i` < `j`.
**Example 1:**
**Input:** nums = \[1,2,3,1,1,3\]
**Output:** 4
**Explanation:** There are 4 good pairs (0,3), (0,4), (3,4), (2,5) 0-indexed.
**Example 2:**
**Input:** nu... | Use two hash tables. The first to save the check-in time for a customer and the second to update the total time between two stations. | Hash Table,String,Design | Medium | 2285 |
69 | hey everyone welcome back to the channel I hope you guys are doing extremely well so we will be continuing with our binary search playlist which is the part of the Strivers A to Z DSA course in case you haven't checked it out yet there's a link in the description please make sure you check it out so we will be starting... | Sqrt(x) | sqrtx | Given a non-negative integer `x`, return _the square root of_ `x` _rounded down to the nearest integer_. The returned integer should be **non-negative** as well.
You **must not use** any built-in exponent function or operator.
* For example, do not use `pow(x, 0.5)` in c++ or `x ** 0.5` in python.
**Example 1:**
... | Try exploring all integers. (Credits: @annujoshi) Use the sorted property of integers to reduced the search space. (Credits: @annujoshi) | Math,Binary Search | Easy | 50,367 |
1,208 | In Budget Again, I was talking about the pattern which I will discuss again and this is also a question on the same pattern. This is a contact question which was done in a hurry. What is the 8% question? We which was done in a hurry. What is the 8% question? We which was done in a hurry. What is the 8% question? We are... | Get Equal Substrings Within Budget | maximum-nesting-depth-of-two-valid-parentheses-strings | You are given two strings `s` and `t` of the same length and an integer `maxCost`.
You want to change `s` to `t`. Changing the `ith` character of `s` to `ith` character of `t` costs `|s[i] - t[i]|` (i.e., the absolute difference between the ASCII values of the characters).
Return _the maximum length of a substring of... | null | String,Stack | Medium | 1737 |
21 | hey what's up guys it's Nick white I do tech and coding stuff on twitch and YouTube so you can check everything out in the description I do all the weed code problems so if you ever want any of these explained you just go check them out this one we're doing is called merge two sorted lists and it's a linked list proble... | Merge Two Sorted Lists | merge-two-sorted-lists | You are given the heads of two sorted linked lists `list1` and `list2`.
Merge the two lists in a one **sorted** list. The list should be made by splicing together the nodes of the first two lists.
Return _the head of the merged linked list_.
**Example 1:**
**Input:** list1 = \[1,2,4\], list2 = \[1,3,4\]
**Output:**... | null | Linked List,Recursion | Easy | 23,88,148,244,1774,2071 |
1,828 | hey everybody this is larry this is me going with q2 of the bi-weekly me going with q2 of the bi-weekly me going with q2 of the bi-weekly contest 50 queries on the number on numbers of points inside the circle uh hit the like button hit the subscribe button join me on discord twitch whatever you need uh yeah so this on... | Queries on Number of Points Inside a Circle | count-ways-to-distribute-candies | You are given an array `points` where `points[i] = [xi, yi]` is the coordinates of the `ith` point on a 2D plane. Multiple points can have the **same** coordinates.
You are also given an array `queries` where `queries[j] = [xj, yj, rj]` describes a circle centered at `(xj, yj)` with a radius of `rj`.
For each query `... | Try to define a recursive approach. For the ith candies, there will be one of the two following cases: If the i - 1 previous candies are already distributed into k bags for the ith candy, you can have k * dp[n - 1][k] ways to distribute the ith candy. We need then to solve the state of (n - 1, k). If the i - 1 previous... | Dynamic Programming | Hard | null |
342 | hello everyone my ADI and today I'm back with lead codes another daily challenge problem so in this video we are going to solve question number 342 that is power of four so we have given an integer n and we have to return true if the number or integer N is a power of four otherwise we have to return false okay so they ... | Power of Four | power-of-four | Given an integer `n`, return _`true` if it is a power of four. Otherwise, return `false`_.
An integer `n` is a power of four, if there exists an integer `x` such that `n == 4x`.
**Example 1:**
**Input:** n = 16
**Output:** true
**Example 2:**
**Input:** n = 5
**Output:** false
**Example 3:**
**Input:** n = 1
**O... | null | Math,Bit Manipulation,Recursion | Easy | 231,326 |
473 | welcome to june's leeco challenge today's problem is match sticks to square you are given an integer array matchsticks where matchsticks is the length of the ith match6 you want to use all the matchsticks to make one square like this you should not break any stick you can link them up and each matchstick must be used e... | Matchsticks to Square | matchsticks-to-square | You are given an integer array `matchsticks` where `matchsticks[i]` is the length of the `ith` matchstick. You want to use **all the matchsticks** to make one square. You **should not break** any stick, but you can link them up, and each matchstick must be used **exactly one time**.
Return `true` if you can make this ... | Treat the matchsticks as an array. Can we split the array into 4 equal halves? Every matchstick can belong to either of the 4 sides. We don't know which one. Maybe try out all options! For every matchstick, we have to try out each of the 4 options i.e. which side it can belong to. We can make use of recursion for this.... | Array,Dynamic Programming,Backtracking,Bit Manipulation,Bitmask | Medium | null |
896 | hey everybody this is Larry this is day 29 of the legal daily challenge and a weekly challenge hit the like button hit the Subscribe button join me on Discord let me know what you think about today's Farm uh it's a problem I haven't done before which is always nice to see whenever I get a prime I haven't seen before ho... | Monotonic Array | smallest-subtree-with-all-the-deepest-nodes | An array is **monotonic** if it is either monotone increasing or monotone decreasing.
An array `nums` is monotone increasing if for all `i <= j`, `nums[i] <= nums[j]`. An array `nums` is monotone decreasing if for all `i <= j`, `nums[i] >= nums[j]`.
Given an integer array `nums`, return `true` _if the given array is ... | null | Hash Table,Tree,Depth-First Search,Breadth-First Search,Binary Tree | Medium | null |
1,793 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem maximum score of a good subarray we're given an integer array nums and an integer k for a subarray so a good subarray in this array is defined as any subarray that includes this index so this is index zero this is one t... | Maximum Score of a Good Subarray | minimum-moves-to-make-array-complementary | You are given an array of integers `nums` **(0-indexed)** and an integer `k`.
The **score** of a subarray `(i, j)` is defined as `min(nums[i], nums[i+1], ..., nums[j]) * (j - i + 1)`. A **good** subarray is a subarray where `i <= k <= j`.
Return _the maximum possible **score** of a **good** subarray._
**Example 1:**... | Given a target sum x, each pair of nums[i] and nums[n-1-i] would either need 0, 1, or 2 modifications. Can you find the optimal target sum x value such that the sum of modifications is minimized? Create a difference array to efficiently sum all the modifications. | Array,Hash Table,Prefix Sum | Medium | null |
26 | hello everyone so in this video we are going to discuss a lead code problem remove duplicates from sorted array so friends before we start in case if you are new to my channel then please subscribe to my channel and click the Bell icon so that you never miss any update so in this problem we are given with an integer ar... | Remove Duplicates from Sorted Array | remove-duplicates-from-sorted-array | Given an integer array `nums` sorted in **non-decreasing order**, remove the duplicates [**in-place**](https://en.wikipedia.org/wiki/In-place_algorithm) such that each unique element appears only **once**. The **relative order** of the elements should be kept the **same**. Then return _the number of unique elements in_... | In this problem, the key point to focus on is the input array being sorted. As far as duplicate elements are concerned, what is their positioning in the array when the given array is sorted? Look at the image above for the answer. If we know the position of one of the elements, do we also know the positioning of all th... | Array,Two Pointers | Easy | 27,80 |
363 | Hello Isko Laddu Start Today Network Problem Dekho Aaj Kidney Problem It is made up of two problems of its own, both of them share the problem, neither is the stand problem and January, many interview questions, lecture, coding questions, sexual intercourse, this would have been understood. And their various issues are... | Max Sum of Rectangle No Larger Than K | max-sum-of-rectangle-no-larger-than-k | Given an `m x n` matrix `matrix` and an integer `k`, return _the max sum of a rectangle in the matrix such that its sum is no larger than_ `k`.
It is **guaranteed** that there will be a rectangle with a sum no larger than `k`.
**Example 1:**
**Input:** matrix = \[\[1,0,1\],\[0,-2,3\]\], k = 2
**Output:** 2
**Explana... | null | Array,Binary Search,Dynamic Programming,Matrix,Ordered Set | Hard | null |
745 | hi guys welcome to tech geeks so today we are back with another lead foot problem that's a lead good daily challenge problem so the problem for today is prefix and suffix search that's basically a lead good heart problem and it's had code 745 so before beginning with this i'd like to request you all to please like shar... | Prefix and Suffix Search | find-smallest-letter-greater-than-target | Design a special dictionary that searches the words in it by a prefix and a suffix.
Implement the `WordFilter` class:
* `WordFilter(string[] words)` Initializes the object with the `words` in the dictionary.
* `f(string pref, string suff)` Returns _the index of the word in the dictionary,_ which has the prefix `p... | Try to find whether each of 26 next letters are in the given string array. | Array,Binary Search | Easy | 2269 |
1,624 | all right so this question is largest substring between two equal characters so given Str as return L of the longest subring between two equal characters including the two I mean exclude the two characters so if there's no substring you return negative one so in this case they are you know they um the string and have a... | Largest Substring Between Two Equal Characters | clone-binary-tree-with-random-pointer | Given a string `s`, return _the length of the longest substring between two equal characters, excluding the two characters._ If there is no such substring return `-1`.
A **substring** is a contiguous sequence of characters within a string.
**Example 1:**
**Input:** s = "aa "
**Output:** 0
**Explanation:** The optim... | Traverse the tree, keep a hashtable with you and create a nodecopy for each node in the tree. Start traversing the original tree again and connect the left, right and random pointers in the cloned tree the same way as the original tree with the help of the hashtable. | Hash Table,Tree,Depth-First Search,Breadth-First Search,Binary Tree | Medium | 133,138,1634 |
760 | hey everybody this is Larry this is me doing weekly premium problem April uh 760. find anagram mappings hit the like button hit the Subscribe button join me in the Discord let me know what you think about this forum you're given two integer arrays numbers one and numbers two and number two is an anagram of numbers one ... | Find Anagram Mappings | bold-words-in-string | You are given two integer arrays `nums1` and `nums2` where `nums2` is **an anagram** of `nums1`. Both arrays may contain duplicates.
Return _an index mapping array_ `mapping` _from_ `nums1` _to_ `nums2` _where_ `mapping[i] = j` _means the_ `ith` _element in_ `nums1` _appears in_ `nums2` _at index_ `j`. If there are mu... | First, determine which letters are bold and store that information in mask[i] = if i-th character is bold.
Then, insert the tags at the beginning and end of groups. The start of a group is if and only if (mask[i] and (i == 0 or not mask[i-1])), and the end of a group is similar. | Array,Hash Table,String,Trie,String Matching | Medium | null |
215 | hello everyone hope you are doing well let's solve get the largest element in an array you will be given an array of elements and the kth value so we need to figure out the kth largest element in this case the K value is 2 so the second largest element in a given input is 5. the simplest solution will be we can sort th... | Kth Largest Element in an Array | kth-largest-element-in-an-array | Given an integer array `nums` and an integer `k`, return _the_ `kth` _largest element in the array_.
Note that it is the `kth` largest element in the sorted order, not the `kth` distinct element.
You must solve it in `O(n)` time complexity.
**Example 1:**
**Input:** nums = \[3,2,1,5,6,4\], k = 2
**Output:** 5
**Ex... | null | Array,Divide and Conquer,Sorting,Heap (Priority Queue),Quickselect | Medium | 324,347,414,789,1014,2113,2204,2250 |
149 | Hello friends, today's question is next points owner line. This is a hard level question of a lead code. In this question we will be given a 2D object which will represent the axis plane and inside this question we have to return the maximum points. We have to return the maximum points which will come in a straight lin... | Max Points on a Line | max-points-on-a-line | Given an array of `points` where `points[i] = [xi, yi]` represents a point on the **X-Y** plane, return _the maximum number of points that lie on the same straight line_.
**Example 1:**
**Input:** points = \[\[1,1\],\[2,2\],\[3,3\]\]
**Output:** 3
**Example 2:**
**Input:** points = \[\[1,1\],\[3,2\],\[5,3\],\[4,1\]... | null | Array,Hash Table,Math,Geometry | Hard | 356,2287 |
343 | today we're gonna be working on it code question number 343 integer break now given an integer and break it into the sum of k positive integers where k is greater than equal to two it can be any number greater than equal to two and maximize the product of these integers return the maximum product you can get so if n is... | Integer Break | integer-break | Given an integer `n`, break it into the sum of `k` **positive integers**, where `k >= 2`, and maximize the product of those integers.
Return _the maximum product you can get_.
**Example 1:**
**Input:** n = 2
**Output:** 1
**Explanation:** 2 = 1 + 1, 1 \* 1 = 1.
**Example 2:**
**Input:** n = 10
**Output:** 36
**Exp... | There is a simple O(n) solution to this problem. You may check the breaking results of n ranging from 7 to 10 to discover the regularities. | Math,Dynamic Programming | Medium | 1936 |
1,732 | all right howdy guys today we're going to be doing leeco question number 1732 find the highest altitude there is a biker going on a road trip the road trip consists of n plus one points at different altitudes the biker starts this trip on point zero with altitude equal to zero you are given an integer array gain of len... | Find the Highest Altitude | minimum-one-bit-operations-to-make-integers-zero | There is a biker going on a road trip. The road trip consists of `n + 1` points at different altitudes. The biker starts his trip on point `0` with altitude equal `0`.
You are given an integer array `gain` of length `n` where `gain[i]` is the **net gain in altitude** between points `i` and `i + 1` for all (`0 <=... | The fastest way to convert n to zero is to remove all set bits starting from the leftmost one. Try some simple examples to learn the rule of how many steps are needed to remove one set bit. consider n=2^k case first, then solve for all n. | Dynamic Programming,Bit Manipulation,Memoization | Hard | 2119 |
1,309 | but today we're gonna be solving this problem on LY code 1309 and what this problem is basically saying is we're going to be given a string and each number in that string is going to be represented by a specific letter so for numbers 1 through 9 it's going to be represented of letters a through AI and then from letters... | Decrypt String from Alphabet to Integer Mapping | sort-items-by-groups-respecting-dependencies | You are given a string `s` formed by digits and `'#'`. We want to map `s` to English lowercase characters as follows:
* Characters (`'a'` to `'i'`) are represented by (`'1'` to `'9'`) respectively.
* Characters (`'j'` to `'z'`) are represented by (`'10#'` to `'26#'`) respectively.
Return _the string formed after ... | Think of it as a graph problem. We need to find a topological order on the dependency graph. Build two graphs, one for the groups and another for the items. | Depth-First Search,Breadth-First Search,Graph,Topological Sort | Hard | null |
387 | hey everybody this is larry this is day 16 of the august daily challenge hit the like button hit the subscribe button join me on discord let me know what you think about today's problem in the county did something in c plus first yesterday so now it falls to c plus fours uh first you need character and a string okay wh... | First Unique Character in a String | first-unique-character-in-a-string | Given a string `s`, _find the first non-repeating character in it and return its index_. If it does not exist, return `-1`.
**Example 1:**
**Input:** s = "leetcode"
**Output:** 0
**Example 2:**
**Input:** s = "loveleetcode"
**Output:** 2
**Example 3:**
**Input:** s = "aabb"
**Output:** -1
**Constraints:**
* `... | null | Hash Table,String,Queue,Counting | Easy | 451 |
1,685 | hello viewers welcome to the coding interviews channel hope you are doing great if you haven't subscribed to the channel yet please go ahead and subscribe i have created bunch of playlists to cover various categories of problems such as bfs dfs daniel programming trees graphs linked list stacks queues and all and so on... | Sum of Absolute Differences in a Sorted Array | stone-game-v | You are given an integer array `nums` sorted in **non-decreasing** order.
Build and return _an integer array_ `result` _with the same length as_ `nums` _such that_ `result[i]` _is equal to the **summation of absolute differences** between_ `nums[i]` _and all the other elements in the array._
In other words, `result[i... | We need to try all possible divisions for the current row to get the max score. As calculating all possible divisions will lead us to calculate some sub-problems more than once, we need to think of dynamic programming. | Array,Math,Dynamic Programming,Game Theory | Hard | 909,1240,1522,1617,1788,1808,2002,2156 |
211 | So welcome to the new video of Gas Take It, today our video is 47 and I will raycomend and subscribe you that if you have not seen the implement tree then definitely watch it because in the upcoming video and 47, today I will tell you. I am going to do it in words also, if the tree comes then we will try it, we will no... | Design Add and Search Words Data Structure | design-add-and-search-words-data-structure | Design a data structure that supports adding new words and finding if a string matches any previously added string.
Implement the `WordDictionary` class:
* `WordDictionary()` Initializes the object.
* `void addWord(word)` Adds `word` to the data structure, it can be matched later.
* `bool search(word)` Returns ... | You should be familiar with how a Trie works. If not, please work on this problem: Implement Trie (Prefix Tree) first. | String,Depth-First Search,Design,Trie | Medium | 208,746 |
258 | hello guys welcome to deep cools and in today's video we will discuss liquid question 258 that says add digits so this question is pretty much simple but that is one mathematical derivation behind this equation that will help us to solve this equation in big of one time complexity so uh that's a constant time complexit... | Add Digits | add-digits | Given an integer `num`, repeatedly add all its digits until the result has only one digit, and return it.
**Example 1:**
**Input:** num = 38
**Output:** 2
**Explanation:** The process is
38 --> 3 + 8 --> 11
11 --> 1 + 1 --> 2
Since 2 has only one digit, return it.
**Example 2:**
**Input:** num = 0
**Output:** 0
*... | A naive implementation of the above process is trivial. Could you come up with other methods? What are all the possible results? How do they occur, periodically or randomly? You may find this Wikipedia article useful. | Math,Simulation,Number Theory | Easy | 202,1082,2076,2264 |
241 | hey everybody this is Larry this is me trying to do an extra bonus question for y'all um one that I haven't done yet hopefully uh and not a premium because I don't have premium oh there you go um and just kind of get some practice in anyway today's problem is different ways to add parentheses so given a string of expre... | Different Ways to Add Parentheses | different-ways-to-add-parentheses | Given a string `expression` of numbers and operators, return _all possible results from computing all the different possible ways to group numbers and operators_. You may return the answer in **any order**.
The test cases are generated such that the output values fit in a 32-bit integer and the number of different res... | null | Math,String,Dynamic Programming,Recursion,Memoization | Medium | 95,224,282,2147,2328 |
1,605 | hey everybody this is larry this is me going over q3 of the code bi-weekly contest 36 find the code bi-weekly contest 36 find the code bi-weekly contest 36 find rounded matrix given row and columns and sums so this one to be honest uh there's something about the way that my thought process is uh and we're new to the ch... | Find Valid Matrix Given Row and Column Sums | minimum-number-of-days-to-make-m-bouquets | You are given two arrays `rowSum` and `colSum` of non-negative integers where `rowSum[i]` is the sum of the elements in the `ith` row and `colSum[j]` is the sum of the elements of the `jth` column of a 2D matrix. In other words, you do not know the elements of the matrix, but you do know the sums of each row and column... | If we can make m or more bouquets at day x, then we can still make m or more bouquets at any day y > x. We can check easily if we can make enough bouquets at day x if we can get group adjacent flowers at day x. | Array,Binary Search | Medium | 2134,2257 |
11 | all right this is 11 container with most water and pretty much for this question you're given an array Heights with the length of N and then the N is the vertical lines right so in this case um this would be the vertical lines right and so you want to find the two lines in the array so along the x- two lines in the arr... | Container With Most Water | container-with-most-water | You are given an integer array `height` of length `n`. There are `n` vertical lines drawn such that the two endpoints of the `ith` line are `(i, 0)` and `(i, height[i])`.
Find two lines that together with the x-axis form a container, such that the container contains the most water.
Return _the maximum amount of water... | The aim is to maximize the area formed between the vertical lines. The area of any container is calculated using the shorter line as length and the distance between the lines as the width of the rectangle.
Area = length of shorter vertical line * distance between lines
We can definitely get the maximum width ... | Array,Two Pointers,Greedy | Medium | 42 |
462 | hello everyone today we will solve lead code 462 which is minimum moves to equal array element 2 and in this problem we have given an array in which we can either decrement a number by one or increment the number by one such a way that all the array element becomes equal we need to return the minimum number of operatio... | Minimum Moves to Equal Array Elements II | minimum-moves-to-equal-array-elements-ii | Given an integer array `nums` of size `n`, return _the minimum number of moves required to make all array elements equal_.
In one move, you can increment or decrement an element of the array by `1`.
Test cases are designed so that the answer will fit in a **32-bit** integer.
**Example 1:**
**Input:** nums = \[1,2,3... | null | Array,Math,Sorting | Medium | 296,453,2160,2290 |
1,641 | Hello Guide London Jerry Amir Today Will Be Discussing Question Account Google Indic Us Zor subscribe this Video plz subscribe appointed subscribed subscribe karenge isko subscribe to aur suna mere saving bank giver problem and will proceed for the subscribe and subscribe the that no admin2 hai result variable end no v... | Count Sorted Vowel Strings | countries-you-can-safely-invest-in | Given an integer `n`, return _the number of strings of length_ `n` _that consist only of vowels (_`a`_,_ `e`_,_ `i`_,_ `o`_,_ `u`_) and are **lexicographically sorted**._
A string `s` is **lexicographically sorted** if for all valid `i`, `s[i]` is the same as or comes before `s[i+1]` in the alphabet.
**Example 1:**
... | null | Database | Medium | 615 |
48 | Hello Gas Hello, we have done it with our new video, we have to do it without any extra space, okay, example, okay, so basically we will first take the transpose, we will try, that is, we will make every pen every day right, so this is our cry. Whatever elements there are, whatever elements there are, then now we will ... | Rotate Image | rotate-image | You are given an `n x n` 2D `matrix` representing an image, rotate the image by **90** degrees (clockwise).
You have to rotate the image [**in-place**](https://en.wikipedia.org/wiki/In-place_algorithm), which means you have to modify the input 2D matrix directly. **DO NOT** allocate another 2D matrix and do the rotati... | null | Array,Math,Matrix | Medium | 2015 |
135 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem candy we're given an array of n children and for each child we have their rating in a ratings array the rules are pretty simple even though they're a bit poorly worded in the problem statement but for every single child... | Candy | candy | There are `n` children standing in a line. Each child is assigned a rating value given in the integer array `ratings`.
You are giving candies to these children subjected to the following requirements:
* Each child must have at least one candy.
* Children with a higher rating get more candies than their neighbors.... | null | Array,Greedy | Hard | null |
1,621 | Hello Friends Today I Will Discuss Your Problems for Latest Good Bye Nikli Contest Policies Problem C Number of Seats from K Non Overlapping Line from Left Side Problem Requested by Allotment Members and Friends Sadhe Problem Arvind Speedo Meter DP Playlist Aa Positive A Main Channel Sequence till now Text Five Role to... | Number of Sets of K Non-Overlapping Line Segments | number-of-subsequences-that-satisfy-the-given-sum-condition | Given `n` points on a 1-D plane, where the `ith` point (from `0` to `n-1`) is at `x = i`, find the number of ways we can draw **exactly** `k` **non-overlapping** line segments such that each segment covers two or more points. The endpoints of each segment must have **integral coordinates**. The `k` line segments **do n... | Sort the array nums. Use two pointers approach: Given an index i (choose it as the minimum in a subsequence) find the maximum j where j ≥ i and nums[i] +nums[j] ≤ target. Count the number of subsequences. | Array,Two Pointers,Binary Search,Sorting | Medium | null |
71 | That's it guys welcome back to my channel english video we are going to solve simply file path polish give any statement hearing in his team for this and salute for starting with a slash to file or directory in unix file system converted today simplified chemical part in unix File System Edit Single Thought In Fast On ... | Simplify Path | simplify-path | Given a string `path`, which is an **absolute path** (starting with a slash `'/'`) to a file or directory in a Unix-style file system, convert it to the simplified **canonical path**.
In a Unix-style file system, a period `'.'` refers to the current directory, a double period `'..'` refers to the directory up a level,... | null | String,Stack | Medium | null |
1,733 | Hello Hi Everyone Welcome Back To Let's Coding That These Pictures Humko * Sal Problem Number That These Pictures Humko * Sal Problem Number That These Pictures Humko * Sal Problem Number Two Of Baahubali Contest Four In The Name Of Problems Minimum Number Of People To Teach So Let's Reader Statement First Owner Social... | Minimum Number of People to Teach | maximum-number-of-visible-points | On a social network consisting of `m` users and some friendships between users, two users can communicate with each other if they know a common language.
You are given an integer `n`, an array `languages`, and an array `friendships` where:
* There are `n` languages numbered `1` through `n`,
* `languages[i]` is th... | Sort the points by polar angle with the original position. Now only a consecutive collection of points would be visible from any coordinate. We can use two pointers to keep track of visible points for each start point For handling the cyclic condition, it’d be helpful to append the point list to itself after sorting. | Array,Math,Geometry,Sliding Window,Sorting | Hard | null |
56 | hey what's up guys this is john here so today let's take a look at today's daily challenge problem number 56 merge intervals you know this one is one of the most classical classic interval problems you know okay so you're given like a ray of in of intervals where has like start and end right you need to merge all the o... | Merge Intervals | merge-intervals | Given an array of `intervals` where `intervals[i] = [starti, endi]`, merge all overlapping intervals, and return _an array of the non-overlapping intervals that cover all the intervals in the input_.
**Example 1:**
**Input:** intervals = \[\[1,3\],\[2,6\],\[8,10\],\[15,18\]\]
**Output:** \[\[1,6\],\[8,10\],\[15,18\]\... | null | Array,Sorting | Medium | 57,252,253,495,616,715,761,768,1028,2297,2319 |
1,704 | hello everyone welcome to quartus camp so today we are at the seventh day of april lead code challenge and the problem we are going to cover is determine if string halves are alike so the given input here is a string and we have to return true if a and b are alike so here a and b are nothing but the first half of the s... | Determine if String Halves Are Alike | special-positions-in-a-binary-matrix | You are given a string `s` of even length. Split this string into two halves of equal lengths, and let `a` be the first half and `b` be the second half.
Two strings are **alike** if they have the same number of vowels (`'a'`, `'e'`, `'i'`, `'o'`, `'u'`, `'A'`, `'E'`, `'I'`, `'O'`, `'U'`). Notice that `s` contains uppe... | Keep track of 1s in each row and in each column. Then while iterating over matrix, if the current position is 1 and current row as well as current column contains exactly one occurrence of 1. | Array,Matrix | Easy | null |
283 | right another day in our lead code problem today we got 283 move zeros it's a very good questions it has a lot of likes 6 000 likes and only 200 dislikes let's read the problem statement so given an integer array nums move all the zeros to the end of it while maintaining the relative order of a nonzero element all righ... | Move Zeroes | move-zeroes | Given an integer array `nums`, move all `0`'s to the end of it while maintaining the relative order of the non-zero elements.
**Note** that you must do this in-place without making a copy of the array.
**Example 1:**
**Input:** nums = \[0,1,0,3,12\]
**Output:** \[1,3,12,0,0\]
**Example 2:**
**Input:** nums = \[0\]... | In-place means we should not be allocating any space for extra array. But we are allowed to modify the existing array. However, as a first step, try coming up with a solution that makes use of additional space. For this problem as well, first apply the idea discussed using an additional array and the in-place solution ... | Array,Two Pointers | Easy | 27 |
1,612 | Hai gas welcome to today's video and today we are going to do lead code problem 1612 named check if 2 expression tree are equivalent so basically we have n two root roots one is the root of one trick and the other root is the root of the other trick and The tree is such that in the entries there is one friend and one o... | Check If Two Expression Trees are Equivalent | avoid-flood-in-the-city | A **[binary expression tree](https://en.wikipedia.org/wiki/Binary_expression_tree)** is a kind of binary tree used to represent arithmetic expressions. Each node of a binary expression tree has either zero or two children. Leaf nodes (nodes with 0 children) correspond to operands (variables), and internal nodes (nodes ... | Keep An array of the last day there was rains over each city. Keep an array of the days you can dry a lake when you face one. When it rains over a lake, check the first possible day you can dry this lake and assign this day to this lake. | Array,Hash Table,Binary Search,Greedy,Heap (Priority Queue) | Medium | null |
1,071 | good evening everyone today we are going to do the daily lead code challenge of 1 February 2023 that is question number 1071 that is greatest common division of strings the question itself is giving you a hint for solving this question we are given two strings SNT and we say t divides as if the concatenation of T is eq... | Greatest Common Divisor of Strings | binary-prefix-divisible-by-5 | For two strings `s` and `t`, we say "`t` divides `s` " if and only if `s = t + ... + t` (i.e., `t` is concatenated with itself one or more times).
Given two strings `str1` and `str2`, return _the largest string_ `x` _such that_ `x` _divides both_ `str1` _and_ `str2`.
**Example 1:**
**Input:** str1 = "ABCABC ", str2... | If X is the first i digits of the array as a binary number, then 2X + A[i] is the first i+1 digits. | Array | Easy | null |
560 | hello and welcome back to the cracking Fang YouTube channel today we are solving lead code problem 560 subarray sum equals K given an array of integers nums and an integer K return the total number of subarrays whose sum equals to k a subarray is a contiguous non-empty k a subarray is a contiguous non-empty k a subarra... | Subarray Sum Equals K | subarray-sum-equals-k | Given an array of integers `nums` and an integer `k`, return _the total number of subarrays whose sum equals to_ `k`.
A subarray is a contiguous **non-empty** sequence of elements within an array.
**Example 1:**
**Input:** nums = \[1,1,1\], k = 2
**Output:** 2
**Example 2:**
**Input:** nums = \[1,2,3\], k = 3
**Ou... | Will Brute force work here? Try to optimize it. Can we optimize it by using some extra space? What about storing sum frequencies in a hash table? Will it be useful? sum(i,j)=sum(0,j)-sum(0,i), where sum(i,j) represents the sum of all the elements from index i to j-1.
Can we use this property to optimize it. | Array,Hash Table,Prefix Sum | Medium | 1,523,713,724,1016,1776,2211,2369 |
692 | hello everyone welcome to learn upload and this video we'll discuss another electric problem that is the Top Gear frequent Awards this is a medium level problem and we will understand what the question is and how we can solve it easily so before moving on if you haven't subscribed to this channel make sure to subscribe... | Top K Frequent Words | top-k-frequent-words | Given an array of strings `words` and an integer `k`, return _the_ `k` _most frequent strings_.
Return the answer **sorted** by **the frequency** from highest to lowest. Sort the words with the same frequency by their **lexicographical order**.
**Example 1:**
**Input:** words = \[ "i ", "love ", "leetcode ", "i ", "... | null | Hash Table,String,Trie,Sorting,Heap (Priority Queue),Bucket Sort,Counting | Medium | 347,1014,1919 |
432 | how's it going youtube dom here in this video we're going to do number 432 all the one data structure so design a data structure to store the strings count to the ability to return the strings with minimum and maximum counts implement the all one clap all one class all one initializes the object in the data structure i... | All O`one Data Structure | all-oone-data-structure | Design a data structure to store the strings' count with the ability to return the strings with minimum and maximum counts.
Implement the `AllOne` class:
* `AllOne()` Initializes the object of the data structure.
* `inc(String key)` Increments the count of the string `key` by `1`. If `key` does not exist in the d... | null | Hash Table,Linked List,Design,Doubly-Linked List | Hard | null |
792 | hey everybody this is larry this is the 22nd of june for the june the code challenge uh hit the like button hit the subscribe button join me on discord let me know what you think about today's problem which is number of matching subsequences so yeah usually i solve this live so it's a little bit slow just fast forward ... | Number of Matching Subsequences | binary-search | Given a string `s` and an array of strings `words`, return _the number of_ `words[i]` _that is a subsequence of_ `s`.
A **subsequence** of a string is a new string generated from the original string with some characters (can be none) deleted without changing the relative order of the remaining characters.
* For exa... | null | Array,Binary Search | Easy | 786 |
869 | hello everyone welcome to day 21st of march equal challenge and today's question is the order power of 2 in this question you are given a positive integer n and we need to tell if we can reorder the digits in the given number n and the resultant number is a power of 2 or not if that is the case we return true if you ca... | Reordered Power of 2 | similar-string-groups | You are given an integer `n`. We reorder the digits in any order (including the original order) such that the leading digit is not zero.
Return `true` _if and only if we can do this so that the resulting number is a power of two_.
**Example 1:**
**Input:** n = 1
**Output:** true
**Example 2:**
**Input:** n = 10
**... | null | Array,String,Depth-First Search,Breadth-First Search,Union Find | Hard | 2276 |
41 | what's up everyone today we're gonna go over Lee code number 41 first missing positive the solution for this one comes from the recode solution is tab itself and before I get into the code I'm gonna tell you the trick of understanding and remembering this problem the answer that they want us to return is actually the i... | First Missing Positive | first-missing-positive | Given an unsorted integer array `nums`, return the smallest missing positive integer.
You must implement an algorithm that runs in `O(n)` time and uses constant extra space.
**Example 1:**
**Input:** nums = \[1,2,0\]
**Output:** 3
**Explanation:** The numbers in the range \[1,2\] are all in the array.
**Example 2:*... | Think about how you would solve the problem in non-constant space. Can you apply that logic to the existing space? We don't care about duplicates or non-positive integers Remember that O(2n) = O(n) | Array,Hash Table | Hard | 268,287,448,770 |
1,921 | this is today's day question so we want to kill as many monsters as possible and we are playing video games to protect like our village our city and so here is the distance and speed so first we can calculate like when the monsters will come so um I create sorry arrive time equals like the distance over the speed so we... | Eliminate Maximum Number of Monsters | eliminate-maximum-number-of-monsters | You are playing a video game where you are defending your city from a group of `n` monsters. You are given a **0-indexed** integer array `dist` of size `n`, where `dist[i]` is the **initial distance** in kilometers of the `ith` monster from the city.
The monsters walk toward the city at a **constant** speed. The speed... | null | null | Medium | null |
897 | hello everyone welcome to date heard of the simple echo challenge and today's question is increasing order search tree so in this question you are given a binary search tree you need to rearrange it in order so that the left most tree is now the root of the tree and every node has no left side and only one right side s... | Increasing Order Search Tree | prime-palindrome | Given the `root` of a binary search tree, rearrange the tree in **in-order** so that the leftmost node in the tree is now the root of the tree, and every node has no left child and only one right child.
**Example 1:**
**Input:** root = \[5,3,6,2,4,null,8,1,null,null,null,7,9\]
**Output:** \[1,null,2,null,3,null,4,nul... | null | Math | Medium | 2202 |
1,833 | hello in this video I will try to solve a lead code problem I'm a programmer with some experience but I don't specialize in solving algorithm problems like this so this is this will be a learning experience for me I will try to solve a problem in approximately 30 minutes I hope I will be able to do that and I will try ... | Maximum Ice Cream Bars | find-the-highest-altitude | It is a sweltering summer day, and a boy wants to buy some ice cream bars.
At the store, there are `n` ice cream bars. You are given an array `costs` of length `n`, where `costs[i]` is the price of the `ith` ice cream bar in coins. The boy initially has `coins` coins to spend, and he wants to buy as many ice cream bar... | Let's note that the altitude of an element is the sum of gains of all the elements behind it Getting the altitudes can be done by getting the prefix sum array of the given array | Array,Prefix Sum | Easy | null |
1,349 | hey what's up guys this is john so this time let's take a look at uh 1349 maximum student taking exam okay so you're given like a m by n matrix right where has like the uh either a dot or a pound sign so if this is a pound sign it means that the seed is broken and the dot means that you can place you can see it here an... | Maximum Students Taking Exam | check-if-it-is-a-straight-line | Given a `m * n` matrix `seats` that represent seats distributions in a classroom. If a seat is broken, it is denoted by `'#'` character otherwise it is denoted by a `'.'` character.
Students can see the answers of those sitting next to the left, right, upper left and upper right, but he cannot see the answers of the s... | If there're only 2 points, return true. Check if all other points lie on the line defined by the first 2 points. Use cross product to check collinearity. | Array,Math,Geometry | Easy | null |
169 | what's up everyone today we're going to go over the code 169 majority element first we'll go over the input and output and then we'll look at the approach we'll be doing divide and conquer and finally we'll look at the code so the input is going to be an integer array and the output is going to be an integer we have to... | Majority Element | majority-element | Given an array `nums` of size `n`, return _the majority element_.
The majority element is the element that appears more than `⌊n / 2⌋` times. You may assume that the majority element always exists in the array.
**Example 1:**
**Input:** nums = \[3,2,3\]
**Output:** 3
**Example 2:**
**Input:** nums = \[2,2,1,1,1,2,... | null | Array,Hash Table,Divide and Conquer,Sorting,Counting | Easy | 229,1102 |
1,439 | hey everybody this is Larry I'm doing this problem as part of a contest so you're gonna watch me live as I go through my darts I'm coding they've been explanation near the end and for more context they'll be a link below on this actual screen cats of the contest how did you do let me know you do hit the like button eit... | Find the Kth Smallest Sum of a Matrix With Sorted Rows | running-total-for-different-genders | You are given an `m x n` matrix `mat` that has its rows sorted in non-decreasing order and an integer `k`.
You are allowed to choose **exactly one element** from each row to form an array.
Return _the_ `kth` _smallest array sum among all possible arrays_.
**Example 1:**
**Input:** mat = \[\[1,3,11\],\[2,4,6\]\], k ... | null | Database | Medium | 1327 |
605 | hey welcome back and this is called can place flowers and so here you're given a array of just binary numbers so just one and zero and then you're also given a number n and so what we want to do here is we're looking in this array and we want to see where can we place a number one wherever there's a zero so you could p... | Can Place Flowers | can-place-flowers | You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in **adjacent** plots.
Given an integer array `flowerbed` containing `0`'s and `1`'s, where `0` means empty and `1` means not empty, and an integer `n`, return `true` _if_ `n` _new flowers can be plan... | null | Array,Greedy | Easy | 495,735 |
1,832 | hey everybody this is larry this is me going with q1 of the weekly contest 237 uh check if the sentence is a pentagram uh hit the like button to subscribe or enjoy me on discord let me know what you think so this one is kind of straightforward you can use for loops you can do uh you know put things in a set uh you coul... | Check if the Sentence Is Pangram | minimum-operations-to-make-a-subsequence | A **pangram** is a sentence where every letter of the English alphabet appears at least once.
Given a string `sentence` containing only lowercase English letters, return `true` _if_ `sentence` _is a **pangram**, or_ `false` _otherwise._
**Example 1:**
**Input:** sentence = "thequickbrownfoxjumpsoverthelazydog "
**O... | The problem can be reduced to computing Longest Common Subsequence between both arrays. Since one of the arrays has distinct elements, we can consider that these elements describe an arrangement of numbers, and we can replace each element in the other array with the index it appeared at in the first array. Then the pro... | Array,Hash Table,Binary Search,Greedy | Hard | null |
148 | everyone welcome to my channel so in this video there are two goals the first goal is to see of course solve this problem and then you're going to do some lab coding here uh and the second goal is to see how you should behave in a real code interview so i'm going to go through the process during the time i do the codin... | Sort List | sort-list | Given the `head` of a linked list, return _the list after sorting it in **ascending order**_.
**Example 1:**
**Input:** head = \[4,2,1,3\]
**Output:** \[1,2,3,4\]
**Example 2:**
**Input:** head = \[-1,5,3,4,0\]
**Output:** \[-1,0,3,4,5\]
**Example 3:**
**Input:** head = \[\]
**Output:** \[\]
**Constraints:**
* ... | null | Linked List,Two Pointers,Divide and Conquer,Sorting,Merge Sort | Medium | 21,75,147,1992 |
977 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem squares of a sorted array and even though this is an easy problem it's a little bit tricky for an easy problem but i do think it's an interesting one it's not impossibly difficult we're given an integer array of nums so... | Squares of a Sorted Array | distinct-subsequences-ii | Given an integer array `nums` sorted in **non-decreasing** order, return _an array of **the squares of each number** sorted in non-decreasing order_.
**Example 1:**
**Input:** nums = \[-4,-1,0,3,10\]
**Output:** \[0,1,9,16,100\]
**Explanation:** After squaring, the array becomes \[16,1,0,9,100\].
After sorting, it be... | null | String,Dynamic Programming | Hard | 2115 |
64 | Yes, let's start again, so today's question is minimum 5, everything is fine, minimum, we have passed our question, so concentration can be as if in a personal life, a salute is standing at 2030 and add it - Verb - To carry means to stand here add it - Verb - To carry means to stand here add it - Verb - To carry means ... | Minimum Path Sum | minimum-path-sum | Given a `m x n` `grid` filled with non-negative numbers, find a path from top left to bottom right, which minimizes the sum of all numbers along its path.
**Note:** You can only move either down or right at any point in time.
**Example 1:**
**Input:** grid = \[\[1,3,1\],\[1,5,1\],\[4,2,1\]\]
**Output:** 7
**Explanat... | null | Array,Dynamic Programming,Matrix | Medium | 62,174,741,2067,2192 |
165 | hey guys welcome back to another video and today we're going to be solving the leakout question compare version numbers all right so in this question we're going to compare the version numbers of version one and version two so if version one is higher than or it has a greater version number then version two we return o... | Compare Version Numbers | compare-version-numbers | Given two version numbers, `version1` and `version2`, compare them.
Version numbers consist of **one or more revisions** joined by a dot `'.'`. Each revision consists of **digits** and may contain leading **zeros**. Every revision contains **at least one character**. Revisions are **0-indexed from left to right**, wit... | null | Two Pointers,String | Medium | null |
1,973 | hey everybody this is Larry this is me doing the last weekly premium problem 1973 count notes equal to the to some of the sentence hit the like button hit the Subscribe button Joop me on Discord let me know what you think about this one is what are you doing for leap day let me know and you know maybe we all should lea... | Count Nodes Equal to Sum of Descendants | count-nodes-equal-to-sum-of-descendants | Given the `root` of a binary tree, return _the number of nodes where the value of the node is equal to the **sum** of the values of its descendants_.
A **descendant** of a node `x` is any node that is on the path from node `x` to some leaf node. The sum is considered to be `0` if the node has no descendants.
**Exampl... | null | null | Medium | null |
24 | okay so today we're looking at question 24 swap notes in pairs given a linked list swap every two adjacent notes and return its head you must solve the problems with the problem without modifying the values in the lists notes so only the notes themselves maybe change so don't overwrite the notes values basically that's... | Swap Nodes in Pairs | swap-nodes-in-pairs | Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list's nodes (i.e., only nodes themselves may be changed.)
**Example 1:**
**Input:** head = \[1,2,3,4\]
**Output:** \[2,1,4,3\]
**Example 2:**
**Input:** head = \[\]
**Output:** \[\... | null | Linked List,Recursion | Medium | 25,528 |
41 | hey everyone welcome back and let's write some more neat code today so today let's solve first missing positive this is a hard problem not because it's hard to solve there's a variety of solutions one solution is an n log n solution another solution is a linear time solution but that one takes also linear time memory a... | First Missing Positive | first-missing-positive | Given an unsorted integer array `nums`, return the smallest missing positive integer.
You must implement an algorithm that runs in `O(n)` time and uses constant extra space.
**Example 1:**
**Input:** nums = \[1,2,0\]
**Output:** 3
**Explanation:** The numbers in the range \[1,2\] are all in the array.
**Example 2:*... | Think about how you would solve the problem in non-constant space. Can you apply that logic to the existing space? We don't care about duplicates or non-positive integers Remember that O(2n) = O(n) | Array,Hash Table | Hard | 268,287,448,770 |
203 | welcome back everyone we're going to be solving leeco 203 remove linked list elements for this problem we are given the head of a link to list and an integer value we want to remove all of the nodes of the linked list that has a node value equal to the value we want to remove and then we want to return the new head at ... | Remove Linked List Elements | remove-linked-list-elements | Given the `head` of a linked list and an integer `val`, remove all the nodes of the linked list that has `Node.val == val`, and return _the new head_.
**Example 1:**
**Input:** head = \[1,2,6,3,4,5,6\], val = 6
**Output:** \[1,2,3,4,5\]
**Example 2:**
**Input:** head = \[\], val = 1
**Output:** \[\]
**Example 3:**... | null | Linked List,Recursion | Easy | 27,237,2216 |
495 | hey everyone welcome back and today I'll be doing another lead code 495 Teemo attacking an easy one our hero Teemo is attacking an enemy Ash with poison attacks when the Teemo attacks Ash gets poisons for ex poisoned for exactly duration seconds more formally an attack at second T will remain Ash is poisoned during uh ... | Teemo Attacking | teemo-attacking | Our hero Teemo is attacking an enemy Ashe with poison attacks! When Teemo attacks Ashe, Ashe gets poisoned for a exactly `duration` seconds. More formally, an attack at second `t` will mean Ashe is poisoned during the **inclusive** time interval `[t, t + duration - 1]`. If Teemo attacks again **before** the poison effe... | null | Array,Simulation | Easy | 56,605,649 |
239 | hello guys welcome back to tech dose and in this video we will see the sliding window maximum problem which is from lead code number 239 so let us first read the problem statement in this problem you are given an array of integer nums there is a sliding window of size k which is moving from the very left of the array t... | Sliding Window Maximum | sliding-window-maximum | You are given an array of integers `nums`, there is a sliding window of size `k` which is moving from the very left of the array to the very right. You can only see the `k` numbers in the window. Each time the sliding window moves right by one position.
Return _the max sliding window_.
**Example 1:**
**Input:** nums... | How about using a data structure such as deque (double-ended queue)? The queue size need not be the same as the window’s size. Remove redundant elements and the queue should store only elements that need to be considered. | Array,Queue,Sliding Window,Heap (Priority Queue),Monotonic Queue | Hard | 76,155,159,265,1814 |
1,955 | Scientist in every sense Sandeep and in this video I will be coming under 16 cricket problem 153 account number and special subscribe what is special sequence subscribe 0512 subscribe 2012 subscribe button subscribe till we presented the quantum answer sheet model we are examples in this Position 5000 So Let's Account ... | Count Number of Special Subsequences | seat-reservation-manager | A sequence is **special** if it consists of a **positive** number of `0`s, followed by a **positive** number of `1`s, then a **positive** number of `2`s.
* For example, `[0,1,2]` and `[0,0,1,1,1,2]` are special.
* In contrast, `[2,1,0]`, `[1]`, and `[0,1,2,0]` are not special.
Given an array `nums` (consisting of... | You need a data structure that maintains the states of the seats. This data structure should also allow you to get the first available seat and flip the state of a seat in a reasonable time. You can let the data structure contain the available seats. Then you want to be able to get the lowest element and erase an eleme... | Design,Heap (Priority Queue) | Medium | 379 |
57 | hey everybody this is Larry this is day 16 of the January leapco daily challenge so we're halfway through from halfway there whoa uh yeah so hit the like button hit the Subscribe button join me on Discord let me know what you think about today's Farm 57 insert interval so okay so you're giving it a way of not overlappi... | Insert Interval | insert-interval | You are given an array of non-overlapping intervals `intervals` where `intervals[i] = [starti, endi]` represent the start and the end of the `ith` interval and `intervals` is sorted in ascending order by `starti`. You are also given an interval `newInterval = [start, end]` that represents the start and end of another i... | null | Array | Medium | 56,715 |
6 | Is that game of bloody mary brand new problem deposit code long mixed with link description below this time paudel do not support that man with saffron is the purpose of the whole time this problem is this girl twisted and want to see you that is jaaye conversion converter Given string tasty and * is exam form s shown ... | Zigzag Conversion | zigzag-conversion | The string `"PAYPALISHIRING "` is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P A H N
A P L S I I G
Y I R
And then read line by line: `"PAHNAPLSIIGYIR "`
Write the code that will take a string and make this co... | null | String | Medium | null |
403 | In this video we will discuss the frog jump problem, its category is hard, in this problem you are given a frog which can do three types of jumps, what are those jumps k -1 k and k + 1 k. What do you think about what are those jumps k -1 k and k + 1 k. What do you think about what are those jumps k -1 k and k + 1 k. Wh... | Frog Jump | frog-jump | A frog is crossing a river. The river is divided into some number of units, and at each unit, there may or may not exist a stone. The frog can jump on a stone, but it must not jump into the water.
Given a list of `stones`' positions (in units) in sorted **ascending order**, determine if the frog can cross the river by... | null | Array,Dynamic Programming | Hard | 1952,2262 |
1,460 | us i am sanjay and this video will discuss lead code problem 1460 make two arrays equal by reversing sub arrays let's see what the problem descriptions is you are given two integer arrays of equal length target and array in one step you can select any non-empty in one step you can select any non-empty in one step you c... | Make Two Arrays Equal by Reversing Subarrays | number-of-substrings-containing-all-three-characters | You are given two integer arrays of equal length `target` and `arr`. In one step, you can select any **non-empty subarray** of `arr` and reverse it. You are allowed to make any number of steps.
Return `true` _if you can make_ `arr` _equal to_ `target` _or_ `false` _otherwise_.
**Example 1:**
**Input:** target = \[1,... | For each position we simply need to find the first occurrence of a/b/c on or after this position. So we can pre-compute three link-list of indices of each a, b, and c. | Hash Table,String,Sliding Window | Medium | 2187 |
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