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1,352 | so hi guys today we are going to solve this question which is product of last k numbers so this is the lead code medium question and this was a pretty good question when i sold it and i would like to share it with you so the question goes like this for example you have a three two zero five three zero two four five for... | Product of the Last K Numbers | maximum-profit-in-job-scheduling | Design an algorithm that accepts a stream of integers and retrieves the product of the last `k` integers of the stream.
Implement the `ProductOfNumbers` class:
* `ProductOfNumbers()` Initializes the object with an empty stream.
* `void add(int num)` Appends the integer `num` to the stream.
* `int getProduct(int... | Think on DP. Sort the elements by starting time, then define the dp[i] as the maximum profit taking elements from the suffix starting at i. Use binarySearch (lower_bound/upper_bound on C++) to get the next index for the DP transition. | Array,Binary Search,Dynamic Programming,Sorting | Hard | 2118,2164 |
137 | humans lucky and welcome to may the gods be with you today we are going to discuss the jewel decoding challenge day 22 problem so let's get into the question first and identify what the requirements are so the question is called single number two problem and what it basically asks is that we need to identify the elemen... | Single Number II | single-number-ii | Given an integer array `nums` where every element appears **three times** except for one, which appears **exactly once**. _Find the single element and return it_.
You must implement a solution with a linear runtime complexity and use only constant extra space.
**Example 1:**
**Input:** nums = \[2,2,3,2\]
**Output:**... | null | Array,Bit Manipulation | Medium | 136,260 |
132 | Ajay Ko This Is First Watch Activity What Part and Partition When Indians will not be there * That Indians will not be there * That Indians will not be there * That Do Part 1-f happened After this movie Do Part 1-f happened After this movie Do Part 1-f happened After this movie Horoscope These are the people but this i... | Palindrome Partitioning II | palindrome-partitioning-ii | Given a string `s`, partition `s` such that every substring of the partition is a palindrome.
Return _the **minimum** cuts needed for a palindrome partitioning of_ `s`.
**Example 1:**
**Input:** s = "aab "
**Output:** 1
**Explanation:** The palindrome partitioning \[ "aa ", "b "\] could be produced using 1 cut.
**... | null | String,Dynamic Programming | Hard | 131,1871 |
389 | hey yo what's up my little coders let me show you in this tutorial how to solve the lethal question number 389 find the difference basically you're given two strings s and t string t is generated by random shuffling string s and then add one more letter at a random position return the letter that was added to t here ar... | Find the Difference | find-the-difference | You are given two strings `s` and `t`.
String `t` is generated by random shuffling string `s` and then add one more letter at a random position.
Return the letter that was added to `t`.
**Example 1:**
**Input:** s = "abcd ", t = "abcde "
**Output:** "e "
**Explanation:** 'e' is the letter that was added.
**Exam... | null | Hash Table,String,Bit Manipulation,Sorting | Easy | 136 |
70 | hey guys uh welcome back to pseudocoders uh today we are going to look at lead core problem 70 which is climbing stairs uh this question was asked in amazon 2021 uh panel interview so we are going to do that today let's start by reading the question here uh it says that your climbing stack is it takes n steps to reach ... | Climbing Stairs | climbing-stairs | You are climbing a staircase. It takes `n` steps to reach the top.
Each time you can either climb `1` or `2` steps. In how many distinct ways can you climb to the top?
**Example 1:**
**Input:** n = 2
**Output:** 2
**Explanation:** There are two ways to climb to the top.
1. 1 step + 1 step
2. 2 steps
**Example 2:**
... | To reach nth step, what could have been your previous steps? (Think about the step sizes) | Math,Dynamic Programming,Memoization | Easy | 747,1013,1236 |
253 | uh this question is meeting rooms too so you're given the array of meeting times intervals so interval I represents starting ending so return the minimum number of the conference room required so this is pretty um I mean it should be pretty easy so the intervals array does not sorted so you're going to sort it so imagi... | Meeting Rooms II | meeting-rooms-ii | Given an array of meeting time intervals `intervals` where `intervals[i] = [starti, endi]`, return _the minimum number of conference rooms required_.
**Example 1:**
**Input:** intervals = \[\[0,30\],\[5,10\],\[15,20\]\]
**Output:** 2
**Example 2:**
**Input:** intervals = \[\[7,10\],\[2,4\]\]
**Output:** 1
**Constr... | Think about how we would approach this problem in a very simplistic way. We will allocate rooms to meetings that occur earlier in the day v/s the ones that occur later on, right? If you've figured out that we have to sort the meetings by their start time, the next thing to think about is how do we do the allocation? Th... | Array,Two Pointers,Greedy,Sorting,Heap (Priority Queue) | Medium | 56,252,452,1184 |
940 | hey what's up guys this is chung here uh this time it called number 940 this thing subsequence is number two okay so today i want to talk about this one first because this is like i would say prerequisite or a very similar question uh regarding for the uh for another problem that i'm going to talk about later so let's ... | Distinct Subsequences II | fruit-into-baskets | Given a string s, return _the number of **distinct non-empty subsequences** of_ `s`. Since the answer may be very large, return it **modulo** `109 + 7`.
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... | null | Array,Hash Table,Sliding Window | Medium | null |
630 | hello everyone welcome to quartus camp so we are at the second day of mail eco challenge and we are going to cover another interesting problem today which is course schedule 3 so now we are given a 2d matrix as our input which are the courses which actually points at the duration of the course and the last day to compl... | Course Schedule III | course-schedule-iii | There are `n` different online courses numbered from `1` to `n`. You are given an array `courses` where `courses[i] = [durationi, lastDayi]` indicate that the `ith` course should be taken **continuously** for `durationi` days and must be finished before or on `lastDayi`.
You will start on the `1st` day and you cannot ... | During iteration, say I want to add the current course, currentTotalTime being total time of all courses taken till now, but adding the current course might exceed my deadline or it doesn’t.
1. If it doesn’t, then I have added one new course. Increment the currentTotalTime with duration of current course. 2. If it e... | Array,Greedy,Heap (Priority Queue) | Hard | 207,210,2176 |
1,283 | hey guys welcome back to another video and today we're going to be solving the lead code question find the smallest divisor given a threshold all right so in this question we're going to be given an array of integers uh called nums and we're also going to be given an integer value called threshold we will choose a posi... | Find the Smallest Divisor Given a Threshold | reformat-date | Given an array of integers `nums` and an integer `threshold`, we will choose a positive integer `divisor`, divide all the array by it, and sum the division's result. Find the **smallest** `divisor` such that the result mentioned above is less than or equal to `threshold`.
Each result of the division is rounded to the ... | Handle the conversions of day, month and year separately. Notice that days always have a two-word ending, so if you erase the last two characters of this days you'll get the number. | String | Easy | null |
895 | Hello Everyone Welcome To Tap Student Ko Maximum Frequency Pushp Similar To What To Do Subscribe To And Sunao Hair Give Example Left assistant Jhaal Sunao Episode Khush Aur Element Pipe Burst Subscribe In All States Will Remove That 12345 Loot 2714 Discuss The Most Frequent Elements The Five Fennel Very Removed And It ... | Maximum Frequency Stack | shortest-path-to-get-all-keys | Design a stack-like data structure to push elements to the stack and pop the most frequent element from the stack.
Implement the `FreqStack` class:
* `FreqStack()` constructs an empty frequency stack.
* `void push(int val)` pushes an integer `val` onto the top of the stack.
* `int pop()` removes and returns the... | null | Bit Manipulation,Breadth-First Search | Hard | null |
791 | hey everyone today we are going to solve lead problem number 791 custom sord string in this question we are given two string order n s the order string is having all the unique characters and these character are specific in some kind of order and the S string is something we have to manipulate and we have to change the... | Custom Sort String | split-bst | You are given two strings order and s. All the characters of `order` are **unique** and were sorted in some custom order previously.
Permute the characters of `s` so that they match the order that `order` was sorted. More specifically, if a character `x` occurs before a character `y` in `order`, then `x` should occur ... | Use recursion. If root.val <= V, you split root.right into two halves, then join it's left half back on root.right. | Tree,Binary Search Tree,Recursion,Binary Tree | Medium | 450 |
322 | hi everyone today we are going to solve the rit called question coin change so you are given integer already coins and representing coins of different denominations and the integer amount representing total amount of money so return the fewest number of coins that you need to make up that amount so if that amount of mo... | Coin Change | coin-change | You are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money.
Return _the fewest number of coins that you need to make up that amount_. If that amount of money cannot be made up by any combination of the coins, return `-1`.
You may a... | null | Array,Dynamic Programming,Breadth-First Search | Medium | 1025,1393,2345 |
68 | Hai gas welcome and welcome back to my channel so in today's video we will see the last problem from arresting top interview 150 so what is the last problem our text justification so what do we do let us understand what is the problem of through statement here Then through the example we will also understand what probl... | Text Justification | text-justification | Given an array of strings `words` and a width `maxWidth`, format the text such that each line has exactly `maxWidth` characters and is fully (left and right) justified.
You should pack your words in a greedy approach; that is, pack as many words as you can in each line. Pad extra spaces `' '` when necessary so that ea... | null | Array,String,Simulation | Hard | 1714,2260 |
1,884 | all right let's do my code uh one sec good there we go all right so this question um i did yesterday was pretty difficult to get my head around but uh so i'll try like my best to explain how it works so you're given two eggs and you want to find out with certainty what the value of f is and the value of f is the floor ... | Egg Drop With 2 Eggs and N Floors | minimum-changes-to-make-alternating-binary-string | You are given **two identical** eggs and you have access to a building with `n` floors labeled from `1` to `n`.
You know that there exists a floor `f` where `0 <= f <= n` such that any egg dropped at a floor **higher** than `f` will **break**, and any egg dropped **at or below** floor `f` will **not break**.
In each ... | Think about how the final string will look like. It will either start with a '0' and be like '010101010..' or with a '1' and be like '10101010..' Try both ways, and check for each way, the number of changes needed to reach it from the given string. The answer is the minimum of both ways. | String | Easy | null |
1,002 | hi my name is david today we're going to do number one zero two find common characters this is an easy level problem on lead code and we're gonna solve it in javascript so this is kind of a long problem it took me a while to figure out but basically the input to understand it we get input is just an array of words and ... | Find Common Characters | maximum-width-ramp | Given a string array `words`, return _an array of all characters that show up in all strings within the_ `words` _(including duplicates)_. You may return the answer in **any order**.
**Example 1:**
**Input:** words = \["bella","label","roller"\]
**Output:** \["e","l","l"\]
**Example 2:**
**Input:** words = \["cool"... | null | Array,Stack,Monotonic Stack | Medium | null |
1,446 | hello viewers welcome back to my channel hope you are doing great if you haven't subscribed to my channel yet please go ahead and subscribe I have created bunch of playlists to cover various categories of problems such as linked lists trees graphs dynamic programming breadth first search depth-first search depth-first ... | Consecutive Characters | angle-between-hands-of-a-clock | The **power** of the string is the maximum length of a non-empty substring that contains only one unique character.
Given a string `s`, return _the **power** of_ `s`.
**Example 1:**
**Input:** s = "leetcode "
**Output:** 2
**Explanation:** The substring "ee " is of length 2 with the character 'e' only.
**Example ... | The tricky part is determining how the minute hand affects the position of the hour hand. Calculate the angles separately then find the difference. | Math | Medium | null |
671 | hey everyone welcome back and today we will be doing another lead code problem 671 second minimum node in the binary tree this is an easy one given a known empty special binary tree consisting of nodes with the non-negative value where nodes with the non-negative value where nodes with the non-negative value where each... | Second Minimum Node In a Binary Tree | second-minimum-node-in-a-binary-tree | Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly `two` or `zero` sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nodes. More formally, the property `root.val = min(root.left.val, root.ri... | null | Tree,Depth-First Search,Binary Tree | Easy | 230 |
67 | Hello Everyone Welcome to Date 10th January Liquid Land Under the Shadow of All the Cases to Pyun in Hotspot 20 subscribe The Video then subscribe to the Page if you liked The Video then subscribe to इस वर्ग के गाने डॉ विन्द्या 2 8 Distance इस वर्ग के गाने डॉ विन्द्या 2 8 Distance इस वर्ग के गाने डॉ विन्द्या 2 8 Distan... | Add Binary | add-binary | Given two binary strings `a` and `b`, return _their sum as a binary string_.
**Example 1:**
**Input:** a = "11", b = "1"
**Output:** "100"
**Example 2:**
**Input:** a = "1010", b = "1011"
**Output:** "10101"
**Constraints:**
* `1 <= a.length, b.length <= 104`
* `a` and `b` consist only of `'0'` or `'1'` chara... | null | Math,String,Bit Manipulation,Simulation | Easy | 2,43,66,1031 |
1,637 | Hello everyone welcome to my channel Quote Surrey with Mike So today we are going to do video number 77 of our playlist Mark is medium but very easy question but the problem statement of this question is very quick meaning I did not like that is why I did not like this question very much Dislikes have been received whi... | Widest Vertical Area Between Two Points Containing No Points | string-compression-ii | Given `n` `points` on a 2D plane where `points[i] = [xi, yi]`, Return _the **widest vertical area** between two points such that no points are inside the area._
A **vertical area** is an area of fixed-width extending infinitely along the y-axis (i.e., infinite height). The **widest vertical area** is the one with the ... | Use dynamic programming. The state of the DP can be the current index and the remaining characters to delete. Having a prefix sum for each character can help you determine for a certain character c in some specific range, how many characters you need to delete to merge all occurrences of c in that range. | String,Dynamic Programming | Hard | null |
905 | hello everyone so in this video let us talk about an easy problem from lead code the problem name is sort array by parity so the problem goes like this that you're given integer edit nums move all the even integers at the beginning of an array followed by all the odd integer so you are given some integer error as you c... | Sort Array By Parity | length-of-longest-fibonacci-subsequence | Given an integer array `nums`, move all the even integers at the beginning of the array followed by all the odd integers.
Return _**any array** that satisfies this condition_.
**Example 1:**
**Input:** nums = \[3,1,2,4\]
**Output:** \[2,4,3,1\]
**Explanation:** The outputs \[4,2,3,1\], \[2,4,1,3\], and \[4,2,1,3\] w... | null | Array,Hash Table,Dynamic Programming | Medium | 1013 |
1,094 | Ka Affair So Adi Se Car Pooling Problem And They Are Going To Its President This Is The Daily Challenge To Them Car Pooling Problem Pashu Understand What Is Time Bill And Of Capacity MTC ISRO Disawar Capacity And Difficult Only Drive Stupid So This Restriction For Example Of Vikar Starting from edit absolutely only to ... | Car Pooling | matrix-cells-in-distance-order | There is a car with `capacity` empty seats. The vehicle only drives east (i.e., it cannot turn around and drive west).
You are given the integer `capacity` and an array `trips` where `trips[i] = [numPassengersi, fromi, toi]` indicates that the `ith` trip has `numPassengersi` passengers and the locations to pick them u... | null | Array,Math,Geometry,Sorting,Matrix | Easy | 2304 |
936 | hey everybody this is larry this is day 21 of the leeco daily challenge hit the like button hit the subscribe button join me on discord let me know what you think about today's farm stamping to sequence so we're about two hours away from the contest uh from the weekly uh we did a little bit better this morning but you ... | Stamping The Sequence | rle-iterator | You are given two strings `stamp` and `target`. Initially, there is a string `s` of length `target.length` with all `s[i] == '?'`.
In one turn, you can place `stamp` over `s` and replace every letter in the `s` with the corresponding letter from `stamp`.
* For example, if `stamp = "abc "` and `target = "abcba "`, t... | null | Array,Design,Counting,Iterator | Medium | null |
377 | hi guys welcome to techie so today we are back with the daily challenge problem that's combination some phone that's basically an 8 medium 377 question uh i will request you to please have a look at this as it's easy based question and uh somewhat a quality one let's see what the question says you have been given an ar... | Combination Sum IV | combination-sum-iv | Given an array of **distinct** integers `nums` and a target integer `target`, return _the number of possible combinations that add up to_ `target`.
The test cases are generated so that the answer can fit in a **32-bit** integer.
**Example 1:**
**Input:** nums = \[1,2,3\], target = 4
**Output:** 7
**Explanation:**
Th... | null | Array,Dynamic Programming | Medium | 39 |
291 | this is logic coding um today let's look at another backtracking problem called world pattern two so we are given two strings one is a pattern another is the string and we want to return true if the string matches the pattern how do we define match so if there is some bijective mapping of single character to string suc... | Word Pattern II | word-pattern-ii | Given a `pattern` and a string `s`, return `true` _if_ `s` _**matches** the_ `pattern`_._
A string `s` **matches** a `pattern` if there is some **bijective mapping** of single characters to strings such that if each character in `pattern` is replaced by the string it maps to, then the resulting string is `s`. A **bije... | null | Hash Table,String,Backtracking | Medium | 290 |
48 | um hello so today we are going to do this problem called rotate image which is part of today's um lead code daily challenge so the problem says we get an n by n uh matrix that represents an image and we want to rotate it by 19 degrees and so what we want to do is rotate it in place so we want to modify the matrix itsel... | 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 |
341 | hello everyone welcome to quartus cam so we are today the 13th day of april leeco challenge and the problem we are going to cover is flattened nested list titrator so the input given here is a nested list and we have to implement the methods next and has next so here in java if you see the function of next and hash nex... | Flatten Nested List Iterator | flatten-nested-list-iterator | You are given a nested list of integers `nestedList`. Each element is either an integer or a list whose elements may also be integers or other lists. Implement an iterator to flatten it.
Implement the `NestedIterator` class:
* `NestedIterator(List nestedList)` Initializes the iterator with the nested list `nestedLi... | null | Stack,Tree,Depth-First Search,Design,Queue,Iterator | Medium | 251,281,385,565 |
20 | Hello everyone, welcome to me is the question of the channel and you have solved this question many times in college either story or story, this question is valid parenthesis, it is metal, Google, so by looking at the input and output, understand what the question is. To understand, you just have to check whether the s... | Valid Parentheses | valid-parentheses | Given a string `s` containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid.
An input string is valid if:
1. Open brackets must be closed by the same type of brackets.
2. Open brackets must be closed in the correct order.
3. Every close bracket has a corres... | An interesting property about a valid parenthesis expression is that a sub-expression of a valid expression should also be a valid expression. (Not every sub-expression) e.g.
{ { } [ ] [ [ [ ] ] ] } is VALID expression
[ [ [ ] ] ] is VALID sub-expression
{ } [ ] is VALID sub-express... | String,Stack | Easy | 22,32,301,1045,2221 |
1,770 | hi everyone let's solve this legal problem so it's a very typical dynamic programming pro problem but the um acceptance rate is not very high let's take a look at this problem so we are given two integer arrays norms and multiplies of size and nm and the arrays are one index is not important here so we begin with a sco... | Maximum Score from Performing Multiplication Operations | minimum-deletions-to-make-character-frequencies-unique | You are given two **0-indexed** integer arrays `nums` and `multipliers` of size `n` and `m` respectively, where `n >= m`.
You begin with a score of `0`. You want to perform **exactly** `m` operations. On the `ith` operation (**0-indexed**) you will:
* Choose one integer `x` from **either the start or the end** of t... | As we can only delete characters, if we have multiple characters having the same frequency, we must decrease all the frequencies of them, except one. Sort the alphabet characters by their frequencies non-increasingly. Iterate on the alphabet characters, keep decreasing the frequency of the current character until it re... | String,Greedy,Sorting | Medium | 1355,2212 |
1,707 | let's go through code 1,77 maximal x with an element from our 1,77 maximal x with an element from our 1,77 maximal x with an element from our array uh for this question it give us a nouns and a quaries uh for every quy um for example 31 it is let has to find those kind of numbers which is smaller equal to the second nu... | Maximum XOR With an Element From Array | check-if-string-is-transformable-with-substring-sort-operations | You are given an array `nums` consisting of non-negative integers. You are also given a `queries` array, where `queries[i] = [xi, mi]`.
The answer to the `ith` query is the maximum bitwise `XOR` value of `xi` and any element of `nums` that does not exceed `mi`. In other words, the answer is `max(nums[j] XOR xi)` for a... | Suppose the first digit you need is 'd'. How can you determine if it's possible to get that digit there? Consider swapping adjacent characters to maintain relative ordering. | String,Greedy,Sorting | Hard | null |
1,619 | hey guys welcome to a new video in today's video we're going to look at a lead code problem and the problems name is mean of an array after removing some elements so in this question we are given an array called Yara we have to return the mean of the remaining integers after removing the smallest five percent and the l... | Mean of Array After Removing Some Elements | path-crossing | Given an integer array `arr`, return _the mean of the remaining integers after removing the smallest `5%` and the largest `5%` of the elements._
Answers within `10-5` of the **actual answer** will be considered accepted.
**Example 1:**
**Input:** arr = \[1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3\]
**Output:** 2.00000
... | Simulate the process while keeping track of visited points. Use a set to store previously visited points. | Hash Table,String | Easy | null |
638 | hey what's up guys this is sean here so today uh let's take a look at lead code number 638 shopping offers okay so your elite code store like there are n items to sell okay and each item has a price but we also have some like special offers and the special offer consists of one or more different kinds of items with a s... | Shopping Offers | shopping-offers | In LeetCode Store, there are `n` items to sell. Each item has a price. However, there are some special offers, and a special offer consists of one or more different kinds of items with a sale price.
You are given an integer array `price` where `price[i]` is the price of the `ith` item, and an integer array `needs` whe... | null | Array,Dynamic Programming,Backtracking,Bit Manipulation,Memoization,Bitmask | Medium | null |
338 | hello everyone welcome to day first of march record challenge and i wish all the viewers of coding decoded channel a very happy mahashivaratri the question that we have in today's counting bits here in this question we are given an integer value n we need to identify the number of ones that exist in all the numbers sta... | Counting Bits | counting-bits | Given an integer `n`, return _an array_ `ans` _of length_ `n + 1` _such that for each_ `i` (`0 <= i <= n`)_,_ `ans[i]` _is the **number of**_ `1`_**'s** in the binary representation of_ `i`.
**Example 1:**
**Input:** n = 2
**Output:** \[0,1,1\]
**Explanation:**
0 --> 0
1 --> 1
2 --> 10
**Example 2:**
**Input:** n =... | You should make use of what you have produced already. Divide the numbers in ranges like [2-3], [4-7], [8-15] and so on. And try to generate new range from previous. Or does the odd/even status of the number help you in calculating the number of 1s? | Dynamic Programming,Bit Manipulation | Easy | 191 |
74 | hey what's up guys Nick white here I do tech and coding stuff on Twitch in YouTube and I haven't made a video in a while but I want to get back into it so I just ate a giant cookie and some jelly beans I got my brain working and we're gonna do some problems today this one is searched in a 2d matrix and it's so hopefull... | Search a 2D Matrix | search-a-2d-matrix | You are given an `m x n` integer matrix `matrix` with the following two properties:
* Each row is sorted in non-decreasing order.
* The first integer of each row is greater than the last integer of the previous row.
Given an integer `target`, return `true` _if_ `target` _is in_ `matrix` _or_ `false` _otherwise_.
... | null | Array,Binary Search,Matrix | Medium | 240 |
763 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem partition labels this is a very interesting and somewhat unique problem we are given a string s and we want to partition the string into as many parts as possible so that each letter appears in at most one part and what... | Partition Labels | special-binary-string | You are given a string `s`. We want to partition the string into as many parts as possible so that each letter appears in at most one part.
Note that the partition is done so that after concatenating all the parts in order, the resultant string should be `s`.
Return _a list of integers representing the size of these ... | Draw a line from (x, y) to (x+1, y+1) if we see a "1", else to (x+1, y-1).
A special substring is just a line that starts and ends at the same y-coordinate, and that is the lowest y-coordinate reached.
Call a mountain a special substring with no special prefixes - ie. only at the beginning and end is the lowest y-coo... | String,Recursion | Hard | 678 |
398 | hi everyone welcome back for another video we are going to do analytical question the question is random pick index given an integer away nonce with possible duplicates randomly output the index of a given target number you can assume that the given target number must exist in the array implement the solution class sol... | Random Pick Index | random-pick-index | Given an integer array `nums` with possible **duplicates**, randomly output the index of a given `target` number. You can assume that the given target number must exist in the array.
Implement the `Solution` class:
* `Solution(int[] nums)` Initializes the object with the array `nums`.
* `int pick(int target)` Pic... | null | Hash Table,Math,Reservoir Sampling,Randomized | Medium | 382,894,912 |
63 | so on today's episode of code with senpai we'll be solving the unique pads problem asked by these companies so the problem states if we're given a grid and we can only go right or down how many unique paths are there to get from the start to the end so how would you solve this on paper well if we're given a grid of two... | Unique Paths II | unique-paths-ii | You are given an `m x n` integer array `grid`. There is a robot initially located at the **top-left corner** (i.e., `grid[0][0]`). The robot tries to move to the **bottom-right corner** (i.e., `grid[m - 1][n - 1]`). The robot can only move either down or right at any point in time.
An obstacle and space are marked as ... | The robot can only move either down or right. Hence any cell in the first row can only be reached from the cell left to it. However, if any cell has an obstacle, you don't let that cell contribute to any path. So, for the first row, the number of ways will simply be
if obstacleGrid[i][j] is not an obstacle
... | Array,Dynamic Programming,Matrix | Medium | 62,1022 |
146 | hey everybody this is Larry I hit the like button hit the subscribe button let me know how you did in this farm I'm gonna stop alive right about now cool 1:46 LRU cache design and design cool 1:46 LRU cache design and design cool 1:46 LRU cache design and implement a data structure for these recently used cash it shoul... | LRU Cache | lru-cache | Design a data structure that follows the constraints of a **[Least Recently Used (LRU) cache](https://en.wikipedia.org/wiki/Cache_replacement_policies#LRU)**.
Implement the `LRUCache` class:
* `LRUCache(int capacity)` Initialize the LRU cache with **positive** size `capacity`.
* `int get(int key)` Return the valu... | null | Hash Table,Linked List,Design,Doubly-Linked List | Medium | 460,588,604,1903 |
482 | Do Hello Hi Friends Welcome Back Today We Are Going To Song Link Problem 2014 License Key For Writing This One Of The Google Interview Questions And You Can See This Year Before We Go Through Description And Details Of Want To Mention That My Channel Is Dedicated To Help People While Preparing For Coding Interview Serv... | License Key Formatting | license-key-formatting | You are given a license key represented as a string `s` that consists of only alphanumeric characters and dashes. The string is separated into `n + 1` groups by `n` dashes. You are also given an integer `k`.
We want to reformat the string `s` such that each group contains exactly `k` characters, except for the first g... | null | String | Easy | null |
823 | Arvind Just Coding And Kuldevi Application Form Nakul Binary System Software Governor Of United Spirits In Teachers That Greater Than One And Share And Trying To Make Everything In Teachers Fuel Mode Value Difficult To The Product Of The Value Of Children Were Beaten Up By Cancer In 1971 Bittu Love You To The Answer Mo... | Binary Trees With Factors | split-array-with-same-average | Given an array of unique integers, `arr`, where each integer `arr[i]` is strictly greater than `1`.
We make a binary tree using these integers, and each number may be used for any number of times. Each non-leaf node's value should be equal to the product of the values of its children.
Return _the number of binary tre... | null | Array,Math,Dynamic Programming,Bit Manipulation,Bitmask | Hard | 2162 |
907 | hey my name is casey and i'm going to walk you through how to do leak code 907 sum of sub-array minimums sum of sub-array minimums sum of sub-array minimums so let's look at the input that they give us they gave us an array of 3124 and all they're doing here is they're breaking it up into all the sub-arrays breaking it... | Sum of Subarray Minimums | koko-eating-bananas | Given an array of integers arr, find the sum of `min(b)`, where `b` ranges over every (contiguous) subarray of `arr`. Since the answer may be large, return the answer **modulo** `109 + 7`.
**Example 1:**
**Input:** arr = \[3,1,2,4\]
**Output:** 17
**Explanation:**
Subarrays are \[3\], \[1\], \[2\], \[4\], \[3,1\], \... | null | Array,Binary Search | Medium | 788,1335,2188 |
122 | hey guys this is Jay sir how are doing in previous video we've done the best time to buy some stock problem today we're gonna do into the follow-up which we're gonna do into the follow-up which we're gonna do into the follow-up which is sell stock - so we have the same is sell stock - so we have the same is sell stock ... | Best Time to Buy and Sell Stock II | best-time-to-buy-and-sell-stock-ii | You are given an integer array `prices` where `prices[i]` is the price of a given stock on the `ith` day.
On each day, you may decide to buy and/or sell the stock. You can only hold **at most one** share of the stock at any time. However, you can buy it then immediately sell it on the **same day**.
Find and return _t... | null | Array,Dynamic Programming,Greedy | Medium | 121,123,188,309,714 |
129 | hello everybody welcome to another video on problem solving in this video we're going to be solving a problem on lead code which is some root to leave numbers so let's just quickly go through the description and then we'll see how we'll be solving the problem so we've been given the root of a binary tree which contains... | Sum Root to Leaf Numbers | sum-root-to-leaf-numbers | You are given the `root` of a binary tree containing digits from `0` to `9` only.
Each root-to-leaf path in the tree represents a number.
* For example, the root-to-leaf path `1 -> 2 -> 3` represents the number `123`.
Return _the total sum of all root-to-leaf numbers_. Test cases are generated so that the answer w... | null | Tree,Depth-First Search,Binary Tree | Medium | 112,124,1030 |
230 | hello everyone welcome to day 18th of april eco challenge and i hope all of you are having a great time my name is ansel today i'm working a software developer for at adobe and today i present day 661 of daily lead code challenge the question that we have in today is kth smallest element in a bst here in this question ... | Kth Smallest Element in a BST | kth-smallest-element-in-a-bst | Given the `root` of a binary search tree, and an integer `k`, return _the_ `kth` _smallest value (**1-indexed**) of all the values of the nodes in the tree_.
**Example 1:**
**Input:** root = \[3,1,4,null,2\], k = 1
**Output:** 1
**Example 2:**
**Input:** root = \[5,3,6,2,4,null,null,1\], k = 3
**Output:** 3
**Cons... | Try to utilize the property of a BST. Try in-order traversal. (Credits to @chan13) What if you could modify the BST node's structure? The optimal runtime complexity is O(height of BST). | Tree,Depth-First Search,Binary Search Tree,Binary Tree | Medium | 94,671 |
83 | okay so we're looking at question 83 remove duplicates from sorted list uh given the head of a sorted linked list we want to delete all duplicates such that uh every element value kind of just appears once um and our linked lists return links list should be sorted as well given an example one two we wanna basically ret... | Remove Duplicates from Sorted List | remove-duplicates-from-sorted-list | Given the `head` of a sorted linked list, _delete all duplicates such that each element appears only once_. Return _the linked list **sorted** as well_.
**Example 1:**
**Input:** head = \[1,1,2\]
**Output:** \[1,2\]
**Example 2:**
**Input:** head = \[1,1,2,3,3\]
**Output:** \[1,2,3\]
**Constraints:**
* The numb... | null | Linked List | Easy | 82,1982 |
598 | hey everybody this is larry this is dave dude yeah from the august the code daily challenge hit the like button hit the subscribe button join me on discord let me know what you think about today's prom and all that other good stuff uh as long as it loads okay range edition two so i usually start these live so watch it ... | Range Addition II | range-addition-ii | You are given an `m x n` matrix `M` initialized with all `0`'s and an array of operations `ops`, where `ops[i] = [ai, bi]` means `M[x][y]` should be incremented by one for all `0 <= x < ai` and `0 <= y < bi`.
Count and return _the number of maximum integers in the matrix after performing all the operations_.
**Exampl... | null | Array,Math | Easy | 370 |
1,649 | through instructions yeah this problem is very easy to understand and it's also easy to do if you use the right data structures so let's first try to understand the problem so we are giving a r of instructions and you asked to create a sorted array from the elements in instructions you start with an empty so for the fi... | Create Sorted Array through Instructions | maximum-number-of-non-overlapping-subarrays-with-sum-equals-target | Given an integer array `instructions`, you are asked to create a sorted array from the elements in `instructions`. You start with an empty container `nums`. For each element from **left to right** in `instructions`, insert it into `nums`. The **cost** of each insertion is the **minimum** of the following:
* The numb... | Keep track of prefix sums to quickly look up what subarray that sums "target" can be formed at each step of scanning the input array. It can be proved that greedily forming valid subarrays as soon as one is found is optimal. | Array,Hash Table,Greedy,Prefix Sum | Medium | null |
1,557 | foreign hey everybody this is Larry this is me doing oh whoops one button okay fine uh what am I doing I am doing day 18th of the May liquor day challenge hit the like button hit the Subscribe button join me on Discord let me know what you think about this farm and as you can see well maybe not I don't know but yeah my... | Minimum Number of Vertices to Reach All Nodes | check-if-a-string-contains-all-binary-codes-of-size-k | Given a **directed acyclic graph**, with `n` vertices numbered from `0` to `n-1`, and an array `edges` where `edges[i] = [fromi, toi]` represents a directed edge from node `fromi` to node `toi`.
Find _the smallest set of vertices from which all nodes in the graph are reachable_. It's guaranteed that a unique solution ... | We need only to check all sub-strings of length k. The number of distinct sub-strings should be exactly 2^k. | Hash Table,String,Bit Manipulation,Rolling Hash,Hash Function | Medium | null |
322 | in this video we are going to solve one interesting problem coin change so let me first explain what is the problem you have given the three coins one two five this denote the denomination of the coins and you can use each coin in any number this is infinite if you want to two points 10 or you want to Five Points 20 ti... | Coin Change | coin-change | You are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money.
Return _the fewest number of coins that you need to make up that amount_. If that amount of money cannot be made up by any combination of the coins, return `-1`.
You may a... | null | Array,Dynamic Programming,Breadth-First Search | Medium | 1025,1393,2345 |
509 | hello everyone hope you all are doing good and in today's video we are going to start a new series um that is the medium difficulty questions for QA we have already covered uh the basic one so if you haven't watched that whole series I strongly suggest you to go and watch that and let me like give you a recap of all th... | Fibonacci Number | inorder-successor-in-bst-ii | The **Fibonacci numbers**, commonly denoted `F(n)` form a sequence, called the **Fibonacci sequence**, such that each number is the sum of the two preceding ones, starting from `0` and `1`. That is,
F(0) = 0, F(1) = 1
F(n) = F(n - 1) + F(n - 2), for n > 1.
Given `n`, calculate `F(n)`.
**Example 1:**
**Input:** n = ... | null | Tree,Binary Search Tree,Binary Tree | Medium | 285 |
1,656 | hey guys pain here so today i'm going to talk about question d called 1656 it's called design orders stream so basically what's given it's two functions there's two class functions we need to implement so basically first one is called order string and it will given uh order so basically it's inserting certain solution ... | Design an Ordered Stream | count-good-triplets | There is a stream of `n` `(idKey, value)` pairs arriving in an **arbitrary** order, where `idKey` is an integer between `1` and `n` and `value` is a string. No two pairs have the same `id`.
Design a stream that returns the values in **increasing order of their IDs** by returning a **chunk** (list) of values after each... | Notice that the constraints are small enough for a brute force solution to pass. Loop through all triplets, and count the ones that are good. | Array,Enumeration | Easy | 2122 |
338 | what's up everyone today we're going to go over lead code 338 counting bits first we'll go over the input and the output then we'll look at the code and the approach side by side and finally we'll go over the complexities i'm going to go over the dp approach because the simple approach is pretty straightforward so the ... | Counting Bits | counting-bits | Given an integer `n`, return _an array_ `ans` _of length_ `n + 1` _such that for each_ `i` (`0 <= i <= n`)_,_ `ans[i]` _is the **number of**_ `1`_**'s** in the binary representation of_ `i`.
**Example 1:**
**Input:** n = 2
**Output:** \[0,1,1\]
**Explanation:**
0 --> 0
1 --> 1
2 --> 10
**Example 2:**
**Input:** n =... | You should make use of what you have produced already. Divide the numbers in ranges like [2-3], [4-7], [8-15] and so on. And try to generate new range from previous. Or does the odd/even status of the number help you in calculating the number of 1s? | Dynamic Programming,Bit Manipulation | Easy | 191 |
231 | hey this is Topher with the lonely Dash and today we're going over lead code question 231 power of two which states given an integer n return true if it's a power of two otherwise return false if an integer N is a power of two there exists an integer X such that n is equal to 2 to the X power okay so what does this rea... | Power of Two | power-of-two | Given an integer `n`, return _`true` if it is a power of two. Otherwise, return `false`_.
An integer `n` is a power of two, if there exists an integer `x` such that `n == 2x`.
**Example 1:**
**Input:** n = 1
**Output:** true
**Explanation:** 20 = 1
**Example 2:**
**Input:** n = 16
**Output:** true
**Explanation:**... | null | Math,Bit Manipulation,Recursion | Easy | 191,326,342 |
976 | day 12th of October lead Cod Challenge the problem that we have in today is largest perameter triangle guys apologies there is renovation going on at my place and I'm not able to post videos right now but so far we have solved all the questions that came for the October monthly challenge those are already available on ... | Largest Perimeter Triangle | minimum-area-rectangle | Given an integer array `nums`, return _the largest perimeter of a triangle with a non-zero area, formed from three of these lengths_. If it is impossible to form any triangle of a non-zero area, return `0`.
**Example 1:**
**Input:** nums = \[2,1,2\]
**Output:** 5
**Explanation:** You can form a triangle with three si... | null | Array,Hash Table,Math,Geometry,Sorting | Medium | null |
5 | to find the longest palindrome substring alright so the interviewer tells you well given a string find the longest substring of the string that's a palindrome what would you ask the interviewer asks you this what would your first questions do the interviewer be alright some great questions there our special characters ... | Longest Palindromic Substring | longest-palindromic-substring | Given a string `s`, return _the longest_ _palindromic_ _substring_ in `s`.
**Example 1:**
**Input:** s = "babad "
**Output:** "bab "
**Explanation:** "aba " is also a valid answer.
**Example 2:**
**Input:** s = "cbbd "
**Output:** "bb "
**Constraints:**
* `1 <= s.length <= 1000`
* `s` consist of only dig... | How can we reuse a previously computed palindrome to compute a larger palindrome? If “aba” is a palindrome, is “xabax” a palindrome? Similarly is “xabay” a palindrome? Complexity based hint:
If we use brute-force and check whether for every start and end position a substring is a palindrome we have O(n^2) start - end ... | String,Dynamic Programming | Medium | 214,266,336,516,647 |
287 | Hello Guys Welcome Back Door And This Video Will Find Duplicate Number Indemnity Alarm Swift Code 25th June Challenge 16 Personal Problem Veer Vs Boys At Least One Number Only One Number One This Is The Very Important Not Give The First You Must Not Modified Cars Only Be used only on Twitter subscribe liked The Video t... | Find the Duplicate Number | find-the-duplicate-number | Given an array of integers `nums` containing `n + 1` integers where each integer is in the range `[1, n]` inclusive.
There is only **one repeated number** in `nums`, return _this repeated number_.
You must solve the problem **without** modifying the array `nums` and uses only constant extra space.
**Example 1:**
**... | null | Array,Two Pointers,Binary Search,Bit Manipulation | Medium | 41,136,142,268,645 |
131 | hello everyone welcome to coding decoded my name is an today I'm working at sd4 at Adobe and here I present solution to Daye 22nd of January lead code challenge last night at around 2 a.m. in the last night at around 2 a.m. in the last night at around 2 a.m. in the morning I published the video for day 21st of January ... | Palindrome Partitioning | palindrome-partitioning | Given a string `s`, partition `s` such that every substring of the partition is a **palindrome**. Return _all possible palindrome partitioning of_ `s`.
**Example 1:**
**Input:** s = "aab"
**Output:** \[\["a","a","b"\],\["aa","b"\]\]
**Example 2:**
**Input:** s = "a"
**Output:** \[\["a"\]\]
**Constraints:**
* `1... | null | String,Dynamic Programming,Backtracking | Medium | 132,1871 |
1,202 | hello everyone welcome to day 27th of april liquid challenge and i hope all of you are having a great time my name is santiago deja i am working a software developer for at adobe and today i present day 666 of daily lead code question the problem that we have in today's smaller string with swaps here in this question w... | Smallest String With Swaps | palindrome-removal | You are given a string `s`, and an array of pairs of indices in the string `pairs` where `pairs[i] = [a, b]` indicates 2 indices(0-indexed) of the string.
You can swap the characters at any pair of indices in the given `pairs` **any number of times**.
Return the lexicographically smallest string that `s` can be chang... | Use dynamic programming. Let dp[i][j] be the solution for the sub-array from index i to index j. Notice that if we have S[i] == S[j] one transition could be just dp(i + 1, j + 1) because in the last turn we would have a palindrome and we can extend this palindrome from both sides, the other transitions are not too diff... | Array,Dynamic Programming | Hard | null |
122 | okay let's talk about base time to buy and sell stock too so if you watch 121 then you probably know the idea so in this question you can do it as many as transaction you like so uh it's not just only one buy and one cell it can be multiple by and multiple cell but you may not engage in multiple transactions simultaneo... | Best Time to Buy and Sell Stock II | best-time-to-buy-and-sell-stock-ii | You are given an integer array `prices` where `prices[i]` is the price of a given stock on the `ith` day.
On each day, you may decide to buy and/or sell the stock. You can only hold **at most one** share of the stock at any time. However, you can buy it then immediately sell it on the **same day**.
Find and return _t... | null | Array,Dynamic Programming,Greedy | Medium | 121,123,188,309,714 |
37 | hi and welcome to solve 64. let's do leak code problem 37 sudoku solver we'll call a method solve with the board and then for the row and columns we'll put 0 and 0 so that's the top left cell we'll check if row has reached 9 and if so we'll say that it's solved and we'll print it and return true we were able to solve i... | Sudoku Solver | sudoku-solver | Write a program to solve a Sudoku puzzle by filling the empty cells.
A sudoku solution must satisfy **all of the following rules**:
1. Each of the digits `1-9` must occur exactly once in each row.
2. Each of the digits `1-9` must occur exactly once in each column.
3. Each of the digits `1-9` must occur exactly onc... | null | Array,Backtracking,Matrix | Hard | 36,1022 |
1,018 | what cool 10:18 binary prefix divisible what cool 10:18 binary prefix divisible what cool 10:18 binary prefix divisible by five keeping it away a of zeros and ones consider and survive drive away from a sub zero to a sub I interpret it as a binary number for most significant digit to a most significant bit to least sig... | Binary Prefix Divisible By 5 | largest-perimeter-triangle | You are given a binary array `nums` (**0-indexed**).
We define `xi` as the number whose binary representation is the subarray `nums[0..i]` (from most-significant-bit to least-significant-bit).
* For example, if `nums = [1,0,1]`, then `x0 = 1`, `x1 = 2`, and `x2 = 5`.
Return _an array of booleans_ `answer` _where_ ... | null | Array,Math,Greedy,Sorting | Easy | 830 |
1,823 | hello everyone today we will solve liquid problem 1823 problem name is find the winner of a circular game so we will understand this problem by you know using one example so let's assume here we have one circular array also we have given one integer K and we have to you know delete that cap integer so if we starting fr... | Find the Winner of the Circular Game | determine-if-string-halves-are-alike | There are `n` friends that are playing a game. The friends are sitting in a circle and are numbered from `1` to `n` in **clockwise order**. More formally, moving clockwise from the `ith` friend brings you to the `(i+1)th` friend for `1 <= i < n`, and moving clockwise from the `nth` friend brings you to the `1st` friend... | Create a function that checks if a character is a vowel, either uppercase or lowercase. | String,Counting | Easy | null |
852 | hey there everyone welcome back to lead coding so i'm your host faraz and in this video we are discussing the solution to the assignment that we uploaded in our interview preparation series so the assignment was based on binary search i gave five questions on binary search so before watching the solution just try go to... | Peak Index in a Mountain Array | friends-of-appropriate-ages | An array `arr` a **mountain** if the following properties hold:
* `arr.length >= 3`
* There exists some `i` with `0 < i < arr.length - 1` such that:
* `arr[0] < arr[1] < ... < arr[i - 1] < arr[i]`
* `arr[i] > arr[i + 1] > ... > arr[arr.length - 1]`
Given a mountain array `arr`, return the index `i` su... | null | Array,Two Pointers,Binary Search,Sorting | Medium | null |
91 | hello everyone in this video we will be solving the problem decode ways the problem statement is a message containing letters from a to z can be encoded into numbers using the following mapping like a is represented by 1 b by 2 and etc until z which is 26 we have been given a string with numbers and we have to find out... | Decode Ways | decode-ways | A message containing letters from `A-Z` can be **encoded** into numbers using the following mapping:
'A' -> "1 "
'B' -> "2 "
...
'Z' -> "26 "
To **decode** an encoded message, all the digits must be grouped then mapped back into letters using the reverse of the mapping above (there may be multiple ways). For examp... | null | String,Dynamic Programming | Medium | 639,2091 |
130 | let's solve legal question 130 surrounded regions and this is our median legal question so give a m n matrix board containing x and o if you look at example here there is x here there's o here capture all regions that are four directionally surrounded by x so this question if your traversal the graph make sure it's fou... | Surrounded Regions | surrounded-regions | Given an `m x n` matrix `board` containing `'X'` and `'O'`, _capture all regions that are 4-directionally surrounded by_ `'X'`.
A region is **captured** by flipping all `'O'`s into `'X'`s in that surrounded region.
**Example 1:**
**Input:** board = \[\[ "X ", "X ", "X ", "X "\],\[ "X ", "O ", "O ", "X "\],\[ "X ", "... | null | Array,Depth-First Search,Breadth-First Search,Union Find,Matrix | Medium | 200,286 |
999 | so this question is available capture for Rook so given the chess board there's is exactly one white Rook represent R and some number of white by shop and black pal empty square and then pretty much uh this is idea so you are given this diagram sorry 2D array right this diagram you want to go on your four different dir... | Available Captures for Rook | regions-cut-by-slashes | On an `8 x 8` chessboard, there is **exactly one** white rook `'R'` and some number of white bishops `'B'`, black pawns `'p'`, and empty squares `'.'`.
When the rook moves, it chooses one of four cardinal directions (north, east, south, or west), then moves in that direction until it chooses to stop, reaches the edge ... | null | Depth-First Search,Breadth-First Search,Union Find,Graph | Medium | null |
174 | Hello Everyone Welcome Back To Hindi Karna Hai Dare To Discuss Them Very Interesting Problem List Ko Damages Arising In This Problem They Will Give Electronic Officer Princess Line Right The Bottom Right Corner Of The Amazing Decide Top Left Corner Of The Great Khali We The Prince Is Subscribe Channel Like And Do Subsc... | Dungeon Game | dungeon-game | The demons had captured the princess and imprisoned her in **the bottom-right corner** of a `dungeon`. The `dungeon` consists of `m x n` rooms laid out in a 2D grid. Our valiant knight was initially positioned in **the top-left room** and must fight his way through `dungeon` to rescue the princess.
The knight has an i... | null | Array,Dynamic Programming,Matrix | Hard | 62,64,741,2354 |
279 | Hello everyone welcome to my channel code sorry with mike so today we are going to do video number 86 of our dynamic programming playlist ok lead code number is 279 which is marked medium I have already made a video on this problem through repetitions and memorization. Okay, I have already made the link in the descript... | Perfect Squares | perfect-squares | Given an integer `n`, return _the least number of perfect square numbers that sum to_ `n`.
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. For example, `1`, `4`, `9`, and `16` are perfect squares while `3` and `11` are not.
**Example ... | null | Math,Dynamic Programming,Breadth-First Search | Medium | 204,264 |
1,920 | in this question we are given array nouns and we are going to return our array and in which case nsi equals to nums i initially uh women think this question is so easy we can just create an array and assign nums i to ensign but after taking a closer look there is a follow-up question can you there is a follow-up questi... | Build Array from Permutation | determine-color-of-a-chessboard-square | Given a **zero-based permutation** `nums` (**0-indexed**), build an array `ans` of the **same length** where `ans[i] = nums[nums[i]]` for each `0 <= i < nums.length` and return it.
A **zero-based permutation** `nums` is an array of **distinct** integers from `0` to `nums.length - 1` (**inclusive**).
**Example 1:**
*... | Convert the coordinates to (x, y) - that is, "a1" is (1, 1), "d7" is (4, 7). Try add the numbers together and look for a pattern. | Math,String | Easy | null |
1,576 | Hello Friends Welcome Back To My Channel Should We Are Going To Discuss Problem From Weekly Contest 0.5 Inch Replace All The From Weekly Contest 0.5 Inch Replace All The From Weekly Contest 0.5 Inch Replace All The Way Sharma Studio And Positivity Character Sundha Were Given Is Singh Sn Food Which Content Parties Engli... | Replace All ?'s to Avoid Consecutive Repeating Characters | reorder-routes-to-make-all-paths-lead-to-the-city-zero | Given a string `s` containing only lowercase English letters and the `'?'` character, convert **all** the `'?'` characters into lowercase letters such that the final string does not contain any **consecutive repeating** characters. You **cannot** modify the non `'?'` characters.
It is **guaranteed** that there are no ... | Treat the graph as undirected. Start a dfs from the root, if you come across an edge in the forward direction, you need to reverse the edge. | Depth-First Search,Breadth-First Search,Graph | Medium | null |
153 | today we will be solving problem number 153 find minimum and rotated sorted array on lead code which is basically a website where people who want to get better at coding or just want to practice their skills and improve could go to this website basically has like a lot of problems just like this one and different ones ... | Find Minimum in Rotated Sorted Array | find-minimum-in-rotated-sorted-array | Suppose an array of length `n` sorted in ascending order is **rotated** between `1` and `n` times. For example, the array `nums = [0,1,2,4,5,6,7]` might become:
* `[4,5,6,7,0,1,2]` if it was rotated `4` times.
* `[0,1,2,4,5,6,7]` if it was rotated `7` times.
Notice that **rotating** an array `[a[0], a[1], a[2], .... | Array was originally in ascending order. Now that the array is rotated, there would be a point in the array where there is a small deflection from the increasing sequence. eg. The array would be something like [4, 5, 6, 7, 0, 1, 2]. You can divide the search space into two and see which direction to go.
Can you think ... | Array,Binary Search | Medium | 33,154 |
383 | okay so let's talk about rinse and no so you're given two string original and magazine so you have to return true if the ringtone can be construct from magazine and force otherwise and later each letter in magazine can only be used once in reasonable so if you look at example right if the one is pretty simple it's defi... | Ransom Note | ransom-note | Given two strings `ransomNote` and `magazine`, return `true` _if_ `ransomNote` _can be constructed by using the letters from_ `magazine` _and_ `false` _otherwise_.
Each letter in `magazine` can only be used once in `ransomNote`.
**Example 1:**
**Input:** ransomNote = "a", magazine = "b"
**Output:** false
**Example ... | null | Hash Table,String,Counting | Easy | 691 |
387 | hey everyone today we are going to solve the question first unique character in a string okay so let me explain with this example so for this question what data structure do you use my answer is hashmap because uh we want to keep two information one is each character and the other is frequency so um let's say uh freak ... | 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 |
766 | hey everyone today I'll be doing another lead code problem toplets metrics 766 this is an easy one given mnx MXN Matrix return true if the Matrix is topless otherwise return false so Autoplex Matrix is a matrix in which diagonal entries are the same three two one four five all the diagonals entries are the same so here... | Toeplitz Matrix | flatten-a-multilevel-doubly-linked-list | Given an `m x n` `matrix`, return _`true` if the matrix is Toeplitz. Otherwise, return `false`._
A matrix is **Toeplitz** if every diagonal from top-left to bottom-right has the same elements.
**Example 1:**
**Input:** matrix = \[\[1,2,3,4\],\[5,1,2,3\],\[9,5,1,2\]\]
**Output:** true
**Explanation:**
In the above gr... | null | Linked List,Depth-First Search,Doubly-Linked List | Medium | 114,1796 |
1,887 | hello good morning uh guys welcome back and you can see there's something different in this new theme just let me know what's you what you think is different uh we'll be solving the question reduction operations to make an array element equal uh it has been asked by Microsoft right not quite a lot but yeah it has been ... | Reduction Operations to Make the Array Elements Equal | minimum-degree-of-a-connected-trio-in-a-graph | Given an integer array `nums`, your goal is to make all elements in `nums` equal. To complete one operation, follow these steps:
1. Find the **largest** value in `nums`. Let its index be `i` (**0-indexed**) and its value be `largest`. If there are multiple elements with the largest value, pick the smallest `i`.
2. F... | Consider a trio with nodes u, v, and w. The degree of the trio is just degree(u) + degree(v) + degree(w) - 6. The -6 comes from subtracting the edges u-v, u-w, and v-w, which are counted twice each in the vertex degree calculation. To get the trios (u,v,w), you can iterate on u, then iterate on each w,v such that w and... | Graph | Hard | null |
546 | hey what's up guys this is john here so today let's take a look at uh 546 remove boxes it's uh i think it's kind of difficult dp problem okay so you're given like several boxes with different colors represented by different positive numbers so each number represents a color and you can remove any of the boxes okay unti... | Remove Boxes | remove-boxes | You are given several `boxes` with different colors represented by different positive numbers.
You may experience several rounds to remove boxes until there is no box left. Each time you can choose some continuous boxes with the same color (i.e., composed of `k` boxes, `k >= 1`), remove them and get `k * k` points.
R... | null | Array,Dynamic Programming,Memoization | Hard | 664,2247 |
153 | hi guys welcome to yet another video of course from scratch so proud of you for showing up every single day consistency is very hard for me also i am managing two channels installing in everything so it would mean so much to me if you could like motivate me by sharing the channel with your friends motivating them also ... | Find Minimum in Rotated Sorted Array | find-minimum-in-rotated-sorted-array | Suppose an array of length `n` sorted in ascending order is **rotated** between `1` and `n` times. For example, the array `nums = [0,1,2,4,5,6,7]` might become:
* `[4,5,6,7,0,1,2]` if it was rotated `4` times.
* `[0,1,2,4,5,6,7]` if it was rotated `7` times.
Notice that **rotating** an array `[a[0], a[1], a[2], .... | Array was originally in ascending order. Now that the array is rotated, there would be a point in the array where there is a small deflection from the increasing sequence. eg. The array would be something like [4, 5, 6, 7, 0, 1, 2]. You can divide the search space into two and see which direction to go.
Can you think ... | Array,Binary Search | Medium | 33,154 |
1,865 | hey everybody this is larry this is me going with q3 of the weekly contest 241 finding pairs for a certain sum so this one to be honest looks like a really hard problem and you should go to my discord channel or hit the like button hit the subscribe button we could chat about it uh but no but this one was kind of trick... | Finding Pairs With a Certain Sum | checking-existence-of-edge-length-limited-paths-ii | You are given two integer arrays `nums1` and `nums2`. You are tasked to implement a data structure that supports queries of two types:
1. **Add** a positive integer to an element of a given index in the array `nums2`.
2. **Count** the number of pairs `(i, j)` such that `nums1[i] + nums2[j]` equals a given value (`0 ... | Find the minimum spanning tree of the given graph. Root the tree in an arbitrary node and calculate the maximum weight of the edge from each node to the chosen root. To answer a query, find the lca between the two nodes, and find the maximum weight from each of the query nodes to their lca and compare it to the given l... | Union Find,Graph,Minimum Spanning Tree | Hard | 1815 |
424 | complete code problem 424 longest repeating character replacement so this problem gives us a shrink and an integer k and basically we can choose or any character in a string and change it into any other characters right and we can perform this operation at most K times right so this is where the K comes in so our goal ... | Longest Repeating Character Replacement | longest-repeating-character-replacement | You are given a string `s` and an integer `k`. You can choose any character of the string and change it to any other uppercase English character. You can perform this operation at most `k` times.
Return _the length of the longest substring containing the same letter you can get after performing the above operations_.
... | null | Hash Table,String,Sliding Window | Medium | 340,1046,2119,2134,2319 |
850 | 850 rectangle area - we're given a list 850 rectangle area - we're given a list 850 rectangle area - we're given a list of access aligned by tangos each rectangle sub I is just the corners find our total area covered by all rectangles in a plane since the answer may be too large return a module some number Wow that's t... | Rectangle Area II | insert-into-a-sorted-circular-linked-list | You are given a 2D array of axis-aligned `rectangles`. Each `rectangle[i] = [xi1, yi1, xi2, yi2]` denotes the `ith` rectangle where `(xi1, yi1)` are the coordinates of the **bottom-left corner**, and `(xi2, yi2)` are the coordinates of the **top-right corner**.
Calculate the **total area** covered by all `rectangles` ... | null | Linked List | Medium | 147 |
11 | hey guys today we're going to go over the code problem called container with the most water where the problem statement says you're given an integer right height of length n and there are n vertical lines drawn you have to find two lines that are together with the x axis that form a container such that the container co... | 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 |
1,800 | Hello guys Ayush in this video and I got beaten to death in Delhi ok number this morning number one plus one from one and according to that is gold fennel so now what we said is that this is after a survey like and Well, okay, whose maximum possible group is given to the element of morning in send a quarter like in thi... | Maximum Ascending Subarray Sum | concatenation-of-consecutive-binary-numbers | Given an array of positive integers `nums`, return the _maximum possible sum of an **ascending** subarray in_ `nums`.
A subarray is defined as a contiguous sequence of numbers in an array.
A subarray `[numsl, numsl+1, ..., numsr-1, numsr]` is **ascending** if for all `i` where `l <= i < r`, `numsi < numsi+1`. Note th... | Express the nth number value in a recursion formula and think about how we can do a fast evaluation. | Math,Bit Manipulation,Simulation | Medium | null |
718 | hello everyone so today's lead code challenge is maximum length of repetitive sub error so here in which we have given with two arrows of num1 and num2 and we have to find the maximum length of a sub error here as you can see the number one is one two three two one and the num two is two three one four seven so here as... | Maximum Length of Repeated Subarray | maximum-length-of-repeated-subarray | Given two integer arrays `nums1` and `nums2`, return _the maximum length of a subarray that appears in **both** arrays_.
**Example 1:**
**Input:** nums1 = \[1,2,3,2,1\], nums2 = \[3,2,1,4,7\]
**Output:** 3
**Explanation:** The repeated subarray with maximum length is \[3,2,1\].
**Example 2:**
**Input:** nums1 = \[0... | Use dynamic programming. dp[i][j] will be the answer for inputs A[i:], B[j:]. | Array,Binary Search,Dynamic Programming,Sliding Window,Rolling Hash,Hash Function | Medium | 209,2051 |
712 | to my Channel today we are going to solve the lead code delete challenge number 712 minimum ask the lead sum for two strings so it's very straightforward we are giving two strings as one and as two we just need to calculate the operations for delete after delete we should make the S1 equals to S2 for example here with ... | Minimum ASCII Delete Sum for Two Strings | minimum-ascii-delete-sum-for-two-strings | Given two strings `s1` and `s2`, return _the lowest **ASCII** sum of deleted characters to make two strings equal_.
**Example 1:**
**Input:** s1 = "sea ", s2 = "eat "
**Output:** 231
**Explanation:** Deleting "s " from "sea " adds the ASCII value of "s " (115) to the sum.
Deleting "t " from "eat " adds 116 to ... | Let dp(i, j) be the answer for inputs s1[i:] and s2[j:]. | String,Dynamic Programming | Medium | 72,300,583 |
140 | Hello hello viewers welcome to my channel today 30mb problems but back to saudi only and problem of world problem give me dad dictionary bold content list of all subscribe our channel subscribe and gives life bj gym dictionary multiple times in a sentence example 1232 subscribe and subscribe the view from dictionary au... | Word Break II | word-break-ii | Given a string `s` and a dictionary of strings `wordDict`, add spaces in `s` to construct a sentence where each word is a valid dictionary word. Return all such possible sentences in **any order**.
**Note** that the same word in the dictionary may be reused multiple times in the segmentation.
**Example 1:**
**Input:... | null | Hash Table,String,Dynamic Programming,Backtracking,Trie,Memoization | Hard | 139,472 |
41 | in this video we'll be going over first missing positive so given an unsorted integer array numbers find the smallest missing positive integer so in our first example we have one two and zero and our first missing uh positive integer is three so we have one two and three because zero is not positive and our second exam... | 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 |
1,424 | hello viewers welcome back to my channel I hope you are enjoying all the videos that I am uploading if you haven't subscribed to my channel yet please go ahead and subscribe today's problem is diagonal travels given a list of integers noms returned all the elements of noms in diagonal order are shown in the below image... | Diagonal Traverse II | maximum-candies-you-can-get-from-boxes | Given a 2D integer array `nums`, return _all elements of_ `nums` _in diagonal order as shown in the below images_.
**Example 1:**
**Input:** nums = \[\[1,2,3\],\[4,5,6\],\[7,8,9\]\]
**Output:** \[1,4,2,7,5,3,8,6,9\]
**Example 2:**
**Input:** nums = \[\[1,2,3,4,5\],\[6,7\],\[8\],\[9,10,11\],\[12,13,14,15,16\]\]
**Ou... | Use Breadth First Search (BFS) to traverse all possible boxes you can open. Only push to the queue the boxes the you have with their keys. | Array,Breadth-First Search | Hard | null |
1,423 | That a hello everyone welcome to day life and asked questions maximum points content from girls without much electronic media subscribe servi element every time subscribe our channel subscribe yes all good give what do we news lighting up to the minute Problem Unlimited Subscribe Element subscribe to subscribe our we w... | Maximum Points You Can Obtain from Cards | maximum-number-of-occurrences-of-a-substring | There are several cards **arranged in a row**, and each card has an associated number of points. The points are given in the integer array `cardPoints`.
In one step, you can take one card from the beginning or from the end of the row. You have to take exactly `k` cards.
Your score is the sum of the points of the card... | Check out the constraints, (maxSize <=26). This means you can explore all substrings in O(n * 26). Find the Maximum Number of Occurrences of a Substring with bruteforce. | Hash Table,String,Sliding Window | Medium | null |
146 | hey guys yeah so welcome to my little sony session i hope you guys subscribe to my channel yeah so this problem is called lru cache uh this problem is very difficult but if you use python then there is a shortcut that you can solve this so let's do it so uh lru cache basically uh initialize the lru cache with uh yeah s... | LRU Cache | lru-cache | Design a data structure that follows the constraints of a **[Least Recently Used (LRU) cache](https://en.wikipedia.org/wiki/Cache_replacement_policies#LRU)**.
Implement the `LRUCache` class:
* `LRUCache(int capacity)` Initialize the LRU cache with **positive** size `capacity`.
* `int get(int key)` Return the valu... | null | Hash Table,Linked List,Design,Doubly-Linked List | Medium | 460,588,604,1903 |
198 | what's up guys this is liq old 198 house robber you are a professional robber planning to rob houses along a street each house has a certain amount of money stashed the only constraint is stopping you from hobby each of them is that Asian sent houses have security system connected and it will automatically contact the ... | House Robber | house-robber | You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems connected and **it will automatically contact the police if two adjacent houses were broken into... | null | Array,Dynamic Programming | Medium | 152,213,256,276,337,600,656,740,2262 |
1,525 | uh hey everybody this is larry this is q3 of the reason the code contest uh cool number of good races for the string uh yeah so the idea here for me is just uh well you can actually i think to in retrospect to be honest i could have done this a little bit better i would have just kept it set um uh so i did it so in cod... | Number of Good Ways to Split a String | queries-on-a-permutation-with-key | You are given a string `s`.
A split is called **good** if you can split `s` into two non-empty strings `sleft` and `sright` where their concatenation is equal to `s` (i.e., `sleft + sright = s`) and the number of distinct letters in `sleft` and `sright` is the same.
Return _the number of **good splits** you can make ... | Create the permutation P=[1,2,...,m], it could be a list for example. For each i, find the position of queries[i] with a simple scan over P and then move this to the beginning. | Array,Binary Indexed Tree,Simulation | Medium | null |
203 | hi welcome to data structure and algorithm series by coding ally is a non-profit organization where ally is a non-profit organization where ally is a non-profit organization where we believe women and gender minority should have a safe space and support system when they can foster their skills and careers in tech i'm y... | 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 |
105 | a we're looking at lead code number 105 it's construct a binary tree from pre-order and in pre-order and in pre-order and in order traversal and so here we're going to get two integer arrays a pre-order and in two integer arrays a pre-order and in two integer arrays a pre-order and in order where the pre-order where th... | Construct Binary Tree from Preorder and Inorder Traversal | construct-binary-tree-from-preorder-and-inorder-traversal | Given two integer arrays `preorder` and `inorder` where `preorder` is the preorder traversal of a binary tree and `inorder` is the inorder traversal of the same tree, construct and return _the binary tree_.
**Example 1:**
**Input:** preorder = \[3,9,20,15,7\], inorder = \[9,3,15,20,7\]
**Output:** \[3,9,20,null,null,... | null | Array,Hash Table,Divide and Conquer,Tree,Binary Tree | Medium | 106 |
399 | Hello gas I am Lalita Aggarwal welcome problem what are you saying ok before going you WhatsApp problem no 1 minute on registration two signs are one problem I have understood well which are some to try once, there are six questions, see these questions. It is literally a very edgy question, there is nothing to be stre... | Evaluate Division | evaluate-division | You are given an array of variable pairs `equations` and an array of real numbers `values`, where `equations[i] = [Ai, Bi]` and `values[i]` represent the equation `Ai / Bi = values[i]`. Each `Ai` or `Bi` is a string that represents a single variable.
You are also given some `queries`, where `queries[j] = [Cj, Dj]` rep... | Do you recognize this as a graph problem? | Array,Depth-First Search,Breadth-First Search,Union Find,Graph,Shortest Path | Medium | null |
927 | Hello Everyone Welcome To Do 7th July Liquid Liner Producer Equal Parts In Distress In The Given RS Winters Veeravansh Me Too Died Due All Into Three Parts Diner Dash Lottery Number 200 Blouse Strong Network Gives Two Presentations Back Parts In 10 On Twitter Lead 987 Which Makes Heart Patient Dance Light Difficult To ... | Three Equal Parts | sum-of-subsequence-widths | You are given an array `arr` which consists of only zeros and ones, divide the array into **three non-empty parts** such that all of these parts represent the same binary value.
If it is possible, return any `[i, j]` with `i + 1 < j`, such that:
* `arr[0], arr[1], ..., arr[i]` is the first part,
* `arr[i + 1], ar... | null | Array,Math,Sorting | Hard | null |
783 | okay so today's daily challenge is minimum distance between VST numbers so basically we want to find uh in bsta we want to find the minimum distance between the values of any two different nodes in the tree so basically if we want to find let's say the tree looks something like this because this is binary search tree i... | Minimum Distance Between BST Nodes | search-in-a-binary-search-tree | Given the `root` of a Binary Search Tree (BST), return _the minimum difference between the values of any two different nodes in the tree_.
**Example 1:**
**Input:** root = \[4,2,6,1,3\]
**Output:** 1
**Example 2:**
**Input:** root = \[1,0,48,null,null,12,49\]
**Output:** 1
**Constraints:**
* The number of nodes... | null | Tree,Binary Search Tree,Binary Tree | Easy | 270,784 |
1,358 | welcome back food and we're discussing today this problem number of suffering contain all three characters let me read the problem so the problems is we are given a stream consisting only those characters a big n Z and we need to return the number of sub string containing at least one occurrence of all these characters... | Number of Substrings Containing All Three Characters | find-positive-integer-solution-for-a-given-equation | Given a string `s` consisting only of characters _a_, _b_ and _c_.
Return the number of substrings containing **at least** one occurrence of all these characters _a_, _b_ and _c_.
**Example 1:**
**Input:** s = "abcabc "
**Output:** 10
**Explanation:** The substrings containing at least one occurrence of the charact... | Loop over 1 ≤ x,y ≤ 1000 and check if f(x,y) == z. | Math,Two Pointers,Binary Search,Interactive | Medium | null |
1 | hello and welcome today we are doing a question from leak code called sum of two integers it is a medium we are going to jump right into it given two integers A and B return the sum of the two integers without using the operators plus and minus example one we have a being one and B being two we output three and example... | Two Sum | two-sum | Given an array of integers `nums` and an integer `target`, return _indices of the two numbers such that they add up to `target`_.
You may assume that each input would have **_exactly_ one solution**, and you may not use the _same_ element twice.
You can return the answer in any order.
**Example 1:**
**Input:** nums... | A really brute force way would be to search for all possible pairs of numbers but that would be too slow. Again, it's best to try out brute force solutions for just for completeness. It is from these brute force solutions that you can come up with optimizations. So, if we fix one of the numbers, say x, we have to scan ... | Array,Hash Table | Easy | 15,18,167,170,560,653,1083,1798,1830,2116,2133,2320 |
79 | hey everyone welcome back and let's write some more neat code today so today let's look at word search this is a pretty good problem and it's definitely very popular so we're given a grid m by n with a bunch of characters or you could say it's a board and we're also given a target word and we want to look for this word... | Word Search | word-search | Given an `m x n` grid of characters `board` and a string `word`, return `true` _if_ `word` _exists in the grid_.
The word can be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. The same letter cell may not be used more than once.
**Example 1:**... | null | Array,Backtracking,Matrix | Medium | 212 |
481 | are you stuck on a coding challenge don't worry we've got your back let's dive in and solve the magical string problem together the problem is to construct a magical string of length n the magical string is a string s of digits consisting of a one followed by one or more occurrences of two and then one or more occurren... | Magical String | magical-string | A magical string `s` consists of only `'1'` and `'2'` and obeys the following rules:
* The string s is magical because concatenating the number of contiguous occurrences of characters `'1'` and `'2'` generates the string `s` itself.
The first few elements of `s` is `s = "1221121221221121122...... "`. If we group th... | null | Two Pointers,String | Medium | null |
1,470 | you guys are let's go over seven 1470 chef-owner a so the question says chef-owner a so the question says chef-owner a so the question says given the array of numbers consisting of two and elements in the form of this over here and if you noticed as this array is actually divided into two x and y return the array so we... | Shuffle the Array | tweet-counts-per-frequency | Given the array `nums` consisting of `2n` elements in the form `[x1,x2,...,xn,y1,y2,...,yn]`.
_Return the array in the form_ `[x1,y1,x2,y2,...,xn,yn]`.
**Example 1:**
**Input:** nums = \[2,5,1,3,4,7\], n = 3
**Output:** \[2,3,5,4,1,7\]
**Explanation:** Since x1\=2, x2\=5, x3\=1, y1\=3, y2\=4, y3\=7 then the answer ... | null | Hash Table,Binary Search,Design,Sorting,Ordered Set | Medium | null |
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