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971 | hi guys welcome to algorithms made easy in this video we will see the question flip binary tree to match pre-order traversal so over to match pre-order traversal so over to match pre-order traversal so over here this question is a little bit ambiguously phrased so let's go ahead and see this question in detail as what ... | Flip Binary Tree To Match Preorder Traversal | shortest-bridge | You are given the `root` of a binary tree with `n` nodes, where each node is uniquely assigned a value from `1` to `n`. You are also given a sequence of `n` values `voyage`, which is the **desired** [**pre-order traversal**](https://en.wikipedia.org/wiki/Tree_traversal#Pre-order) of the binary tree.
Any node in the bi... | null | Array,Depth-First Search,Breadth-First Search,Matrix | Medium | null |
1,614 | all right so let's talk about the maximum depth of parenthesis so basically you just have to pump the number of opening and closing and you just basically just keep track of the maximum opening and if you see a closing you have the decrement right away so you will get the number of the next uh message of the expect so ... | Maximum Nesting Depth of the Parentheses | maximum-nesting-depth-of-the-parentheses | A string is a **valid parentheses string** (denoted **VPS**) if it meets one of the following:
* It is an empty string `" "`, or a single character not equal to `"( "` or `") "`,
* It can be written as `AB` (`A` concatenated with `B`), where `A` and `B` are **VPS**'s, or
* It can be written as `(A)`, where `A` i... | null | null | Easy | null |
1,287 | hello hi guys good morning welcome back to the new video subi I hope that you guys are doing good this video Problem elements appearing more than 25% in sorted array now sorry for than 25% in sorted array now sorry for than 25% in sorted array now sorry for being late um like while I was making notes for you uh I could... | Element Appearing More Than 25% In Sorted Array | distance-between-bus-stops | Given an integer array **sorted** in non-decreasing order, there is exactly one integer in the array that occurs more than 25% of the time, return that integer.
**Example 1:**
**Input:** arr = \[1,2,2,6,6,6,6,7,10\]
**Output:** 6
**Example 2:**
**Input:** arr = \[1,1\]
**Output:** 1
**Constraints:**
* `1 <= arr... | Find the distance between the two stops if the bus moved in clockwise or counterclockwise directions. | Array | Easy | null |
1,646 | The Freedom Fighters And Doing Surveillance Get Maximum Pin Generate A Problem Seizures To The West What Is Now Statement Is This Government And Are Not Sufficient And Placid In The Language Of The Giver And * * * Whatever Happens Here Will And * * * Whatever Happens Here Will And * * * Whatever Happens Here Will Alway... | Get Maximum in Generated Array | kth-missing-positive-number | You are given an integer `n`. A **0-indexed** integer array `nums` of length `n + 1` is generated in the following way:
* `nums[0] = 0`
* `nums[1] = 1`
* `nums[2 * i] = nums[i]` when `2 <= 2 * i <= n`
* `nums[2 * i + 1] = nums[i] + nums[i + 1]` when `2 <= 2 * i + 1 <= n`
Return _the **maximum** integer in the... | Keep track of how many positive numbers are missing as you scan the array. | Array,Binary Search | Easy | 2305 |
430 | hello guys my name is lazaro and today we'll be doing a leak code problem this problem is called flatten a multi-level doubly linked list multi-level doubly linked list multi-level doubly linked list you're given a doubly linked list which contains nodes that have next pointer a previous pointer and an additional child... | Flatten a Multilevel Doubly Linked List | flatten-a-multilevel-doubly-linked-list | You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional **child pointer**. This child pointer may or may not point to a separate doubly linked list, also containing these special nodes. These child lists may have one or more children of their own, and so ... | null | null | Medium | null |
519 | and what's up guys so let's solve this 590 190 uh one line random flip matrix so your agreed matrix with all values set to zero and uh there are you need to there are three functions right one is uh initialize and the one is uh randomly pick a flip indices so you pick up i say where originally matrix is zero and flippe... | Random Flip Matrix | widest-pair-of-indices-with-equal-range-sum | There is an `m x n` binary grid `matrix` with all the values set `0` initially. Design an algorithm to randomly pick an index `(i, j)` where `matrix[i][j] == 0` and flips it to `1`. All the indices `(i, j)` where `matrix[i][j] == 0` should be equally likely to be returned.
Optimize your algorithm to minimize the numbe... | Keep prefix sums of both arrays. Can the difference between the prefix sums at an index help us? What happens if the difference between the two prefix sums at an index a is x, and x again at a different index b? This means that the sum of nums1 from index a + 1 to index b is equal to the sum of nums2 from index a + 1 t... | Array,Hash Table,Prefix Sum | Medium | null |
1,309 | hello viewers welcome back to my channel I'm back with another problem from leadcore decrypting a string from alphabet to integer mapping so we are given a string s formed by 8 digits 0 to 9 and hash symbol we want to map s to English lowercase characters as follows basically characters a to I are represented by number... | 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 |
1,915 | hey what's up guys this is chung here again so this time uh lead called number uh 1915 number of wonderful substrings okay so a wonderful string is a string where at most one letter appears an odd number of times okay so this one is another like problem that's you need to uh work with the parity right apparently of the... | Number of Wonderful Substrings | check-if-one-string-swap-can-make-strings-equal | A **wonderful** string is a string where **at most one** letter appears an **odd** number of times.
* For example, `"ccjjc "` and `"abab "` are wonderful, but `"ab "` is not.
Given a string `word` that consists of the first ten lowercase English letters (`'a'` through `'j'`), return _the **number of wonderful non-e... | The answer is false if the number of nonequal positions in the strings is not equal to 0 or 2. Check that these positions have the same set of characters. | Hash Table,String,Counting | Easy | 889 |
639 | hey what's up guys uh this is chung here uh again so this time lead code number 639 decode ways number two okay so this one you know it's very similar to the decoded ways number one right so you know the only difference for this one is that you know uh is besides the numbers from zero to nine we also have like a wild c... | Decode Ways II | decode-ways-ii | 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 | Hard | 91,2091,2251 |
94 | Ka Sevan Kaise Aap Log To Can Say That This New Series Distributors Juice And Friends Use Jor Code In Java Script Only So Friends Now Without Further You All Subscribe The Tree Of Hello Friends Please Forgive Me For This Handwriting This Is Tay Be Taken Into Consideration And Solutions to solve different types of what ... | 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 |
1,558 | hey what is up guys today we got another leak question number 1558 minimum number of function calls to make target array i literally just finished this question and i don't want to do this but i'm going to explain the question really nicely and you'll fully understand the answer really quickly so we have this function ... | Minimum Numbers of Function Calls to Make Target Array | course-schedule-iv | You are given an integer array `nums`. You have an integer array `arr` of the same length with all values set to `0` initially. You also have the following `modify` function:
You want to use the modify function to covert `arr` to `nums` using the minimum number of calls.
Return _the minimum number of function calls t... | Imagine if the courses are nodes of a graph. We need to build an array isReachable[i][j]. Start a bfs from each course i and assign for each course j you visit isReachable[i][j] = True. Answer the queries from the isReachable array. | Depth-First Search,Breadth-First Search,Graph,Topological Sort | Medium | null |
1,420 | Hello everyone welcome to my channel Quote Surrey with Mike So today we are going to do video number 15 of our playlist of DP Concept and Questions Okay first of all watch a motivation Yankee speech Excuses are like drugs it makes you feel good for a moment but If You Keep Doing It In The Long Run You'll Never Be Able ... | Build Array Where You Can Find The Maximum Exactly K Comparisons | find-the-start-and-end-number-of-continuous-ranges | You are given three integers `n`, `m` and `k`. Consider the following algorithm to find the maximum element of an array of positive integers:
You should build the array arr which has the following properties:
* `arr` has exactly `n` integers.
* `1 <= arr[i] <= m` where `(0 <= i < n)`.
* After applying the menti... | null | Database | Medium | 1357,1759 |
797 | foreign Target first let's read the question given a directed acyclic graph of n nodes labeled from 0 to n minus 1 find all possible parts from node 0 to node n minus 1 and return them in any order the graph is given as fall of graph of I is a list of all nodes you can visit from node I so here you can see the example ... | All Paths From Source to Target | rabbits-in-forest | Given a directed acyclic graph (**DAG**) of `n` nodes labeled from `0` to `n - 1`, find all possible paths from node `0` to node `n - 1` and return them in **any order**.
The graph is given as follows: `graph[i]` is a list of all nodes you can visit from node `i` (i.e., there is a directed edge from node `i` to node `... | null | Array,Hash Table,Math,Greedy | Medium | null |
1,589 | hey everybody this is larry this is me going over q2 of the recent bi-weekly me going over q2 of the recent bi-weekly me going over q2 of the recent bi-weekly contest uh maximum sum obtained of any permutation hit the like button the subscribe button join me on discord and let me know what you think about this problem ... | Maximum Sum Obtained of Any Permutation | maximum-sum-obtained-of-any-permutation | We have an array of integers, `nums`, and an array of `requests` where `requests[i] = [starti, endi]`. The `ith` request asks for the sum of `nums[starti] + nums[starti + 1] + ... + nums[endi - 1] + nums[endi]`. Both `starti` and `endi` are _0-indexed_.
Return _the maximum total sum of all requests **among all permuta... | null | null | Medium | null |
4 | Hello Hi Guys Welcome to my YouTube channel, I am Sakshi Tiwari and the media talking in today's video, Not Too Short Dress, I have already made this in the video but I think I have mentioned some points there like same size is different. Due to the size, I did not hide the highlights inside, so a lot of comments came,... | Median of Two Sorted Arrays | median-of-two-sorted-arrays | Given two sorted arrays `nums1` and `nums2` of size `m` and `n` respectively, return **the median** of the two sorted arrays.
The overall run time complexity should be `O(log (m+n))`.
**Example 1:**
**Input:** nums1 = \[1,3\], nums2 = \[2\]
**Output:** 2.00000
**Explanation:** merged array = \[1,2,3\] and median is ... | null | Array,Binary Search,Divide and Conquer | Hard | null |
1,031 | Hello Hi Guys to Ajay, in this video we will discuss 2 solutions of maximum sum of two 9 overlapping service, so before this you should remember the solution of Maximum Savere which I had danced in Maximum Savere, so that there should be unity in everything, maximum etc. had been extracted inside it. In this case, we h... | Maximum Sum of Two Non-Overlapping Subarrays | add-to-array-form-of-integer | Given an integer array `nums` and two integers `firstLen` and `secondLen`, return _the maximum sum of elements in two non-overlapping **subarrays** with lengths_ `firstLen` _and_ `secondLen`.
The array with length `firstLen` could occur before or after the array with length `secondLen`, but they have to be non-overlap... | null | Array,Math | Easy | 2,66,67,415 |
1,064 | all so this question is fix point so you are giv the integer array in ascending order so return a small index I let's satisfy the array I equal to I so if there's no such index netive one so you know this is stra for enough so let's look it is uh this is uh the integer array so uh what we are doing you know traversing ... | Fixed Point | smallest-integer-divisible-by-k | Given an array of distinct integers `arr`, where `arr` is sorted in **ascending order**, return the smallest index `i` that satisfies `arr[i] == i`. If there is no such index, return `-1`.
**Example 1:**
**Input:** arr = \[-10,-5,0,3,7\]
**Output:** 3
**Explanation:** For the given array, `arr[0] = -10, arr[1] = -5, ... | 11111 = 1111 * 10 + 1
We only need to store remainders modulo K. If we never get a remainder of 0, why would that happen, and how would we know that? | Hash Table,Math | Medium | null |
334 | Increasing Triple Sequence I J K Sach Date I < Fauj Okay, so if I look at the first example in the morning, I did yesterday's 1 2 3 4 Okay, then if I take the three values of starting, if I have these discounts, then I am take the three values of starting, if I have these discounts, then I am take the three valu... | Increasing Triplet Subsequence | increasing-triplet-subsequence | Given an integer array `nums`, return `true` _if there exists a triple of indices_ `(i, j, k)` _such that_ `i < j < k` _and_ `nums[i] < nums[j] < nums[k]`. If no such indices exists, return `false`.
**Example 1:**
**Input:** nums = \[1,2,3,4,5\]
**Output:** true
**Explanation:** Any triplet where i < j < k is valid.
... | null | Array,Greedy | Medium | 300,2122,2280 |
1,035 | hello guys welcome to deep codes and in today's video we will discuss liquid question 1035 that says unclose lines although this question looks hard at a first time but I am sure that after watching this video you will find this question is super simple Yes guys this question is not that hard it is very much a type of ... | Uncrossed Lines | cousins-in-binary-tree | You are given two integer arrays `nums1` and `nums2`. We write the integers of `nums1` and `nums2` (in the order they are given) on two separate horizontal lines.
We may draw connecting lines: a straight line connecting two numbers `nums1[i]` and `nums2[j]` such that:
* `nums1[i] == nums2[j]`, and
* the line we d... | null | Tree,Depth-First Search,Breadth-First Search,Binary Tree | Easy | 102 |
1,466 | let's solve leak code 1466 reorder routes to make all paths lead to the city zero so this is obviously a graph problem we're given n nodes or cities numbered from 0 to n minus 1 and we're given n minus 1 roads which are the edges in this case so the first thing to do is understand what the problem is telling us so the ... | Reorder Routes to Make All Paths Lead to the City Zero | jump-game-v | There are `n` cities numbered from `0` to `n - 1` and `n - 1` roads such that there is only one way to travel between two different cities (this network form a tree). Last year, The ministry of transport decided to orient the roads in one direction because they are too narrow.
Roads are represented by `connections` wh... | Use dynamic programming. dp[i] is max jumps you can do starting from index i. Answer is max(dp[i]). dp[i] = 1 + max (dp[j]) where j is all indices you can reach from i. | Array,Dynamic Programming,Sorting | Hard | 2001 |
1,040 | 10:40 moving stones until consecutive - 10:40 moving stones until consecutive - 10:40 moving stones until consecutive - on an infinity spare time and finish an infinity of number line the position of IV stone is given by stone survived for stomach and stone endpoint stolen - stomach and stone endpoint stolen - stomach ... | Moving Stones Until Consecutive II | maximum-binary-tree-ii | There are some stones in different positions on the X-axis. You are given an integer array `stones`, the positions of the stones.
Call a stone an **endpoint stone** if it has the smallest or largest position. In one move, you pick up an **endpoint stone** and move it to an unoccupied position so that it is no longer a... | null | Tree,Binary Tree | Medium | 654 |
111 | Jhal Hello Hi Guys Welcome To Koteshwar Today's Question Is Minimum Death Of Binary Tree In This Question Given By Ministry And Where To Find A Minimum Date And What Is The Minimum Date Eminem Death Easy Number Of Nodal Officer Test 500mb Root Not Want To Be Nearest Lymph Node Notice Not With No Children For Example Se... | Minimum Depth of Binary Tree | minimum-depth-of-binary-tree | Given a binary tree, find its minimum depth.
The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.
**Note:** A leaf is a node with no children.
**Example 1:**
**Input:** root = \[3,9,20,null,null,15,7\]
**Output:** 2
**Example 2:**
**Input:** root = \[2... | null | Tree,Depth-First Search,Breadth-First Search,Binary Tree | Easy | 102,104 |
55 | hey guys it's offline one here and today we're going to be solving Jump game in this problem we're given an integer array nums and we're told that we're initially positioned at the array's first index so for example we're going to have to always start at this first index and they tell us that each element in the array ... | Jump Game | jump-game | You are given an integer array `nums`. You are initially positioned at the array's **first index**, and each element in the array represents your maximum jump length at that position.
Return `true` _if you can reach the last index, or_ `false` _otherwise_.
**Example 1:**
**Input:** nums = \[2,3,1,1,4\]
**Output:** t... | null | Array,Dynamic Programming,Greedy | Medium | 45,1428,2001 |
150 | hey guys welcome to a new video in today's video we're going to look at lead code problem and the problem's name is evaluate reverse polish notation so in this question we given an array of strings called tokens and that represents an arthamatic expression in a reverse polish notation so a reverse polish notation can a... | Evaluate Reverse Polish Notation | evaluate-reverse-polish-notation | You are given an array of strings `tokens` that represents an arithmetic expression in a [Reverse Polish Notation](http://en.wikipedia.org/wiki/Reverse_Polish_notation).
Evaluate the expression. Return _an integer that represents the value of the expression_.
**Note** that:
* The valid operators are `'+'`, `'-'`, ... | null | Array,Math,Stack | Medium | 224,282 |
342 | hello everyone how you doing welcome back to my video series on solving lead code problems so now we're going to the power of four I'm just going to so power of four given an integer n return true it's a power of four otherwise return false an integr N is a power of four if there exists an integer X such that n = 4 to ... | 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 |
117 | hey what's up guys this is chung here so let's take a look at today's daily challenge problem number 117 populating next right pointers in each node number two i believe i have done videos uh for this not for the number one problem you know and so this problem is exactly the same except for uh except for the uh the thr... | Populating Next Right Pointers in Each Node II | populating-next-right-pointers-in-each-node-ii | Given a binary tree
struct Node {
int val;
Node \*left;
Node \*right;
Node \*next;
}
Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to `NULL`.
Initially, all next pointers are set to `NULL`.
**Example 1:**
**Input:** root = \[1,2,3... | null | Linked List,Tree,Depth-First Search,Breadth-First Search,Binary Tree | Medium | 116 |
1,776 | so hello everyone welcome to my channel and in this video i will be explaining the problem car fleet too so this is a pretty difficult problem and it's like one of those inception kind of mind-bending problems inception kind of mind-bending problems inception kind of mind-bending problems like a lot of collisions are h... | Car Fleet II | minimum-operations-to-reduce-x-to-zero | There are `n` cars traveling at different speeds in the same direction along a one-lane road. You are given an array `cars` of length `n`, where `cars[i] = [positioni, speedi]` represents:
* `positioni` is the distance between the `ith` car and the beginning of the road in meters. It is guaranteed that `positioni < ... | Think in reverse; instead of finding the minimum prefix + suffix, find the maximum subarray. Finding the maximum subarray is standard and can be done greedily. | Array,Hash Table,Binary Search,Sliding Window,Prefix Sum | Medium | 209,560,2183,2290 |
1,710 | so guys consistency is the key you have heard this we all know this but yeah when we start with lip code after maybe two or three days we stop solving problems after two or three days after maybe 10 or 15 questions we stopped doing that but let's just commit for this daily lit code challenge series and from whichever d... | 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 |
828 | hey everybody this is larry this is august 9 of 2022 um and again i'm going to try to do another thing um try to do another bonus question let me know what you think hit the like button hit the subscribe button drop me on discord let me know what you think um and i earlier today i did do a problem already but it was an... | Count Unique Characters of All Substrings of a Given String | chalkboard-xor-game | Let's define a function `countUniqueChars(s)` that returns the number of unique characters on `s`.
* For example, calling `countUniqueChars(s)` if `s = "LEETCODE "` then `"L "`, `"T "`, `"C "`, `"O "`, `"D "` are the unique characters since they appear only once in `s`, therefore `countUniqueChars(s) = 5`.
Given a ... | null | Array,Math,Bit Manipulation,Brainteaser,Game Theory | Hard | null |
426 | this is little called pasture for 26 combat binary search tree two-storied combat binary search tree two-storied combat binary search tree two-storied don't linker list this is medium question let's get into combat binary search tree to a surah doctrinal totally link released in place you can think of the left and righ... | Convert Binary Search Tree to Sorted Doubly Linked List | convert-binary-search-tree-to-sorted-doubly-linked-list | Convert a **Binary Search Tree** to a sorted **Circular Doubly-Linked List** in place.
You can think of the left and right pointers as synonymous to the predecessor and successor pointers in a doubly-linked list. For a circular doubly linked list, the predecessor of the first element is the last element, and the succe... | null | null | Medium | null |
1,748 | hey everybody this is larry this is me going with q1 of the bi-weekly me going with q1 of the bi-weekly me going with q1 of the bi-weekly contest 45 sum of unique elements so in this problem you're given an array of nums and you have to just keep track of uh the number of elements that or the sum of the elements that o... | Sum of Unique Elements | best-team-with-no-conflicts | You are given an integer array `nums`. The unique elements of an array are the elements that appear **exactly once** in the array.
Return _the **sum** of all the unique elements of_ `nums`.
**Example 1:**
**Input:** nums = \[1,2,3,2\]
**Output:** 4
**Explanation:** The unique elements are \[1,3\], and the sum is 4.
... | First, sort players by age and break ties by their score. You can now consider the players from left to right. If you choose to include a player, you must only choose players with at least that score later on. | Array,Dynamic Programming,Sorting | Medium | null |
509 | hey folks what's up in this video we're going to see about how to approach a Fibonacci problem in the lead code will start by actually discussing the recursive solution and its time complexity and then we'll further move to the better approach and then finally we'll end this video with the most optimal approach so till... | 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 |
20 | welcome to january's leeco challenge today's problem is valid parentheses given a string s containing just the characters uh open close parentheses brackets whatever determine if the input string is valid an input string is valid if open brackets must be closed by the same type of brackets okay and open brackets must b... | 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 |
35 | hey everybody this is Larry this is day 10 of the litko daily challenge I'm back in New York just to give you a cube heads up I don't know if you care if it's fine but I hit the like button hit the subscribe button let me know what you think let me know your thoughts and all that stuff in general let's get bite to it s... | Search Insert Position | search-insert-position | Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.
You must write an algorithm with `O(log n)` runtime complexity.
**Example 1:**
**Input:** nums = \[1,3,5,6\], target = 5
**Output:** 2
**Exa... | null | Array,Binary Search | Easy | 278 |
7 | 210 Videos Can See How They Can Do With Sophia Not Seen More Revenue and 100g Tube School Will Take a Simpler Than Adhir What We Can Do the Result long and subscribe the Channel Please subscribe and subscribe this Video not Who is the President of Superhit 100 Ventral Access Medical 204 Ki And What Will Be Doing Hair O... | Reverse Integer | reverse-integer | Given a signed 32-bit integer `x`, return `x` _with its digits reversed_. If reversing `x` causes the value to go outside the signed 32-bit integer range `[-231, 231 - 1]`, then return `0`.
**Assume the environment does not allow you to store 64-bit integers (signed or unsigned).**
**Example 1:**
**Input:** x = 123
... | null | Math | Medium | 8,190,2238 |
1,038 | hello friends so today in this video we're gonna discuss another problem from lead code a problem on trees problem name binary search tree to create a summary so as you can see in this problem statement you are given a binary search tree and you have to actually convert this tree into binary sum tree what this binary s... | Binary Search Tree to Greater Sum Tree | number-of-squareful-arrays | Given the `root` of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus the sum of all keys greater than the original key in BST.
As a reminder, a _binary search tree_ is a tree that satisfies these constraints:
* The left subtree of a... | null | Array,Math,Dynamic Programming,Backtracking,Bit Manipulation,Bitmask | Hard | 47 |
131 | hey everybody this is larry this is day 14 of the leeco daily challenge hit the like button subscribe button join me on discord let me know what you think about today's problem palindrome partitioning so i do self and look at these problems live so if it goes a little bit slow just watch it on 2x or something like that... | 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 |
101 | hi guys welcome to the channel this is vaga going to do another leech code question and the question in question is number 101 symmetric tree so you're given a tree and you're supposed to write um to return a boolean on whether or not it's symmetric right so this is pretty straightforward and uh the thing to note here ... | Symmetric Tree | symmetric-tree | Given the `root` of a binary tree, _check whether it is a mirror of itself_ (i.e., symmetric around its center).
**Example 1:**
**Input:** root = \[1,2,2,3,4,4,3\]
**Output:** true
**Example 2:**
**Input:** root = \[1,2,2,null,3,null,3\]
**Output:** false
**Constraints:**
* The number of nodes in the tree is in... | null | Tree,Depth-First Search,Breadth-First Search,Binary Tree | Easy | null |
1,641 | hey everybody this is larry this is day 10 of the may or day 11 wow of the may lego day challenge hit the like button hit the subscribe button join me on discord let me know what you think about today's prom um i'm still in san francisco so that my timing of my doing and also releasing the video is a little bit awkward... | 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 |
1,866 | hey what's up guys uh this is sean here so this time uh it's called number 1866 a number of ways to rearrange sticks with k sticks visible okay so this one you know um it's a classic you know uh dp problem right so basically you know you're given like uh they're like unique size of sticks uh whose lens are integers fro... | Number of Ways to Rearrange Sticks With K Sticks Visible | restore-the-array-from-adjacent-pairs | There are `n` uniquely-sized sticks whose lengths are integers from `1` to `n`. You want to arrange the sticks such that **exactly** `k` sticks are **visible** from the left. A stick is **visible** from the left if there are no **longer** sticks to the **left** of it.
* For example, if the sticks are arranged `[1,3,... | Find the first element of nums - it will only appear once in adjacentPairs. The adjacent pairs are like edges of a graph. Perform a depth-first search from the first element. | Array,Hash Table | Medium | null |
1,971 | Welcome back again you will get the calling. What we need to know is that we have given you a source and a test nation and let's say we have some path like this and it is connected like this right let's see. From this point you will be asked whether you are in this Point, this is our source, can you reach here by walki... | Find if Path Exists in Graph | incremental-memory-leak | There is a **bi-directional** graph with `n` vertices, where each vertex is labeled from `0` to `n - 1` (**inclusive**). The edges in the graph are represented as a 2D integer array `edges`, where each `edges[i] = [ui, vi]` denotes a bi-directional edge between vertex `ui` and vertex `vi`. Every vertex pair is connecte... | What is the upper bound for the number of seconds? Simulate the process of allocating memory. | Simulation | Medium | null |
1,022 | this is a binary tree problem and it's binary in even the values so it's not just binary tree its values are also binary that is node values are 0 and 1. so here in this problem what we have to do all the nodes will have either 0 or 1 so you have to start from root node and then traverse the tree so when you traverse t... | Sum of Root To Leaf Binary Numbers | unique-paths-iii | You are given the `root` of a binary tree where each node has a value `0` or `1`. Each root-to-leaf path represents a binary number starting with the most significant bit.
* For example, if the path is `0 -> 1 -> 1 -> 0 -> 1`, then this could represent `01101` in binary, which is `13`.
For all leaves in the tree, c... | null | Array,Backtracking,Bit Manipulation,Matrix | Hard | 37,63,212 |
1,361 | Well, it has just been course number 177 of the it code and they put this problem up, it was quite ugly. It can only solve the problems. This problem is more or less what it is about is that they are going to give us a graph with a tree and we have to see yes and all The nodes of that graph of that tree give us they do... | Validate Binary Tree Nodes | tiling-a-rectangle-with-the-fewest-squares | You have `n` binary tree nodes numbered from `0` to `n - 1` where node `i` has two children `leftChild[i]` and `rightChild[i]`, return `true` if and only if **all** the given nodes form **exactly one** valid binary tree.
If node `i` has no left child then `leftChild[i]` will equal `-1`, similarly for the right child.
... | Can you use backtracking to solve this problem ?. Suppose you've placed a bunch of squares. Where is the natural spot to place the next square ?. The maximum number of squares to be placed will be ≤ max(n,m). | Dynamic Programming,Backtracking | Hard | null |
203 | hello everyone welcome back and today we are looking at question 203 which is remove linked list elements so we are given the head of a linked list and an integer value we want to remove all the nodes of the linked list that has node that value equals to the value that they give us and we want to return the new head le... | 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 |
121 | um hey what's up guys NIC ye I do tacking cutting stuff on twitching YouTube I'm doing all the leak out and a crank rum so I playlist for those I'm a channel everything else in the description this problem is called best time to buy and sell stock it's an easy problem a lot of likes will give it a like it's super easy ... | Best Time to Buy and Sell Stock | best-time-to-buy-and-sell-stock | You are given an array `prices` where `prices[i]` is the price of a given stock on the `ith` day.
You want to maximize your profit by choosing a **single day** to buy one stock and choosing a **different day in the future** to sell that stock.
Return _the maximum profit you can achieve from this transaction_. If you ... | null | Array,Dynamic Programming | Easy | 53,122,123,188,309,2138,2144 |
68 | Hello Hello Everyone Diwakar Distance from Type Coding So today in this video we are going to solve this question Text Vacation You must have seen on your browser that all the lines on the legs on which you sleep, they all end at one point. Or the width of the line is determined by the site except the last one on time,... | 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 |
204 | Hello Hi Everyone Welcome To My Channel It's All The Problem Account Friends This Problem Is Cotton Skin Apple Microsoft Amazon Interviews And One Of The Basic Problem Which Comes In Top Problem Starting Programming Ko College Problem Inch This Number And Subscribe Them Total Number Of Prime Numbers For example will st... | Count Primes | count-primes | Given an integer `n`, return _the number of prime numbers that are strictly less than_ `n`.
**Example 1:**
**Input:** n = 10
**Output:** 4
**Explanation:** There are 4 prime numbers less than 10, they are 2, 3, 5, 7.
**Example 2:**
**Input:** n = 0
**Output:** 0
**Example 3:**
**Input:** n = 1
**Output:** 0
**Co... | Let's start with a isPrime function. To determine if a number is prime, we need to check if it is not divisible by any number less than n. The runtime complexity of isPrime function would be O(n) and hence counting the total prime numbers up to n would be O(n2). Could we do better? As we know the number must not be div... | Array,Math,Enumeration,Number Theory | Medium | 263,264,279 |
1,758 | hey everyone today we are going to solve the question minimum changes to make alternating binary string okay at first I thought I just change to zero if previous character is one or vice versa but it doesn't work if we have like this like a one z0 1 0 so if we apply the logic to this input string we should return five ... | Minimum Changes To Make Alternating Binary String | distribute-repeating-integers | You are given a string `s` consisting only of the characters `'0'` and `'1'`. In one operation, you can change any `'0'` to `'1'` or vice versa.
The string is called alternating if no two adjacent characters are equal. For example, the string `"010 "` is alternating, while the string `"0100 "` is not.
Return _the **m... | Count the frequencies of each number. For example, if nums = [4,4,5,5,5], frequencies = [2,3]. Each customer wants all of their numbers to be the same. This means that each customer will be assigned to one number. Use dynamic programming. Iterate through the numbers' frequencies, and choose some subset of customers to ... | Array,Dynamic Programming,Backtracking,Bit Manipulation,Bitmask | Hard | null |
904 | hi everyone this is steve today we're going to go through legal problem 904 fruit into baskets let's take a look at the problem in the row of trees the ice tree produces fruit with type 3 eye you can start at any tree of your choice then repeatedly perform the following steps there are two steps step one is add one pie... | Fruit Into Baskets | leaf-similar-trees | You are visiting a farm that has a single row of fruit trees arranged from left to right. The trees are represented by an integer array `fruits` where `fruits[i]` is the **type** of fruit the `ith` tree produces.
You want to collect as much fruit as possible. However, the owner has some strict rules that you must foll... | null | Tree,Depth-First Search,Binary Tree | Easy | null |
693 | hello today's problem will be problem number 693 that is binary number with alternating bits the problem statement is given a positive integer check whether it has alternating bits namely if two adjacent bits will always have different values so let's take an example of what the problem statement states is so we are gi... | Binary Number with Alternating Bits | binary-number-with-alternating-bits | Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values.
**Example 1:**
**Input:** n = 5
**Output:** true
**Explanation:** The binary representation of 5 is: 101
**Example 2:**
**Input:** n = 7
**Output:** false
**Explanation:** The binary repr... | null | Bit Manipulation | Easy | 191 |
787 | hey guys welcome to a new video in today's video we're going to look at a lead code problem and the problem's name is cheapest flights within K stops so in this question we are given n which represents the number of cities and they are connected by some number of flights you given an array called Flights where every el... | Cheapest Flights Within K Stops | sliding-puzzle | There are `n` cities connected by some number of flights. You are given an array `flights` where `flights[i] = [fromi, toi, pricei]` indicates that there is a flight from city `fromi` to city `toi` with cost `pricei`.
You are also given three integers `src`, `dst`, and `k`, return _**the cheapest price** from_ `src` _... | Perform a breadth-first-search, where the nodes are the puzzle boards and edges are if two puzzle boards can be transformed into one another with one move. | Array,Breadth-First Search,Matrix | Hard | null |
1,673 | hello guys welcome back to the channel today we are solving another lead code problem that is 1673 find the most competitive subsequence before jumping into the solution I would highly recommend you should read the problem statement on your own and give at least 15 to 30 minutes this problem so let's get right into it ... | Find the Most Competitive Subsequence | find-the-most-competitive-subsequence | Given an integer array `nums` and a positive integer `k`, return _the most **competitive** subsequence of_ `nums` _of size_ `k`.
An array's subsequence is a resulting sequence obtained by erasing some (possibly zero) elements from the array.
We define that a subsequence `a` is more **competitive** than a subsequence ... | null | null | Medium | null |
143 | at least you're giving the hand of a single linked list the list can be represented as node 1.203 etc node 1.203 etc node 1.203 etc so basically we're giving your legs for example one two three four we want to reorder to be one four two three so one and then last note and then second and second to the last and then thi... | Reorder List | reorder-list | You are given the head of a singly linked-list. The list can be represented as:
L0 -> L1 -> ... -> Ln - 1 -> Ln
_Reorder the list to be on the following form:_
L0 -> Ln -> L1 -> Ln - 1 -> L2 -> Ln - 2 -> ...
You may not modify the values in the list's nodes. Only nodes themselves may be changed.
**Example 1:**
**... | null | Linked List,Two Pointers,Stack,Recursion | Medium | 2216 |
203 | hello and welcome to this video today we will solve the lead code problem to remove linked list elements in this problem we have been given the head of a linked list and an integer val and we've been asked to remove all the nodes of this linked list which have the value equal to the input val and we need to return the ... | 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 |
779 | hello everyone welcome back here is vamson with another live coding challenge so today we are going to tackle a popular problem from uh L code the key symbol in grammar so let's dive into it uh so the task is to build a table of n rows and we started by writing zero in the first row now in every subsequent row we repla... | K-th Symbol in Grammar | max-chunks-to-make-sorted-ii | We build a table of `n` rows (**1-indexed**). We start by writing `0` in the `1st` row. Now in every subsequent row, we look at the previous row and replace each occurrence of `0` with `01`, and each occurrence of `1` with `10`.
* For example, for `n = 3`, the `1st` row is `0`, the `2nd` row is `01`, and the `3rd` r... | Each k for which some permutation of arr[:k] is equal to sorted(arr)[:k] is where we should cut each chunk. | Array,Stack,Greedy,Sorting,Monotonic Stack | Hard | 780 |
1,447 | That's Naresh Lootkhor Problem 147 Celebration More Than This List Of All Celebration Will Win 211 To 239 Meter Is Equal To The Can We Do Subscribe Like Share And Only One 2012 Is Not Only Possible Subscribe To Fuel Surcharge Meaning 154 Tomorrow Morning Have Similar To What We Can Do We Need to Front Rock Fractions of... | Simplified Fractions | jump-game-iv | Given an integer `n`, return _a list of all **simplified** fractions between_ `0` _and_ `1` _(exclusive) such that the denominator is less-than-or-equal-to_ `n`. You can return the answer in **any order**.
**Example 1:**
**Input:** n = 2
**Output:** \[ "1/2 "\]
**Explanation:** "1/2 " is the only unique fraction wit... | Build a graph of n nodes where nodes are the indices of the array and edges for node i are nodes i+1, i-1, j where arr[i] == arr[j]. Start bfs from node 0 and keep distance. The answer is the distance when you reach node n-1. | Array,Hash Table,Breadth-First Search | Hard | 2001 |
77 | okay today's question is question 77 of the leap code combinations given two integers n and k return all possible solutions or return all possible combinations of k numbers out of the range 1 to n you may return the answer in any order so we have n which is equal to four here n being the range so it's going to be one t... | Combinations | combinations | Given two integers `n` and `k`, return _all possible combinations of_ `k` _numbers chosen from the range_ `[1, n]`.
You may return the answer in **any order**.
**Example 1:**
**Input:** n = 4, k = 2
**Output:** \[\[1,2\],\[1,3\],\[1,4\],\[2,3\],\[2,4\],\[3,4\]\]
**Explanation:** There are 4 choose 2 = 6 total combin... | null | Backtracking | Medium | 39,46 |
11 | hello welcome back to oh elite code with hatchery benji now you may be wondering since last episode ben has your screen time gone down and the answer is no unfortunate listen mate i've been watching teenage ninja mutant turtles and spiderman this 1994 mate i've got to stop myself it's actually clinical like this is bad... | 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 |
63 | welcome back friends today we are going to solve lead code problem 63 unique paths 2. so uh here a robot is given uh in the starting position and robot wants to uh you know reach to this ending position given by star right and there can be obstacles like this is representing uh in red color so this is the obstacle so r... | 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 |
5 | so this question has been asked by Amazon Cisco Adobe Google Apple Oracle Yahoo Microsoft Goldman Sachs Walmart the list goes on and on the question is longest parring subin hi guys uh welcome to day one of 100 days 100K placement challenge in which 100K people will be getting placement after this challenge so and what... | 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 |
12 | hello guys welcome back to techdos and in this video we will see the integer to Roman problem which is from lead code number 12 it is an implementation based problem which is frequently Asked in interviews particularly in Amazon so before looking at the problem statement I would like to announce about the tech dose DSA... | Integer to Roman | integer-to-roman | Roman numerals are represented by seven different symbols: `I`, `V`, `X`, `L`, `C`, `D` and `M`.
**Symbol** **Value**
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
For example, `2` is written as `II` in Roman numeral, just two one's adde... | null | Hash Table,Math,String | Medium | 13,273 |
1,603 | Hello friends, welcome to our YouTube channel, so today we are going to do a question of late code which is easy to design parking system, in this we have to design the parking system, okay it is very simple, people do not have to do anything much in this. Special okay so what design here you are parking lot by parking... | Design Parking System | running-sum-of-1d-array | Design a parking system for a parking lot. The parking lot has three kinds of parking spaces: big, medium, and small, with a fixed number of slots for each size.
Implement the `ParkingSystem` class:
* `ParkingSystem(int big, int medium, int small)` Initializes object of the `ParkingSystem` class. The number of slot... | Think about how we can calculate the i-th number in the running sum from the (i-1)-th number. | Array,Prefix Sum | Easy | null |
1,232 | hello and welcome to today's daily lead code challenge let's begin question 1233 check if it is a straight line so you're given an array of coordinates I is another array X Y where X Y represents a coordinate of a point check if these points make a straight line in the X Y plane and some examples so we have points one ... | Check If It Is a Straight Line | sum-of-mutated-array-closest-to-target | You are given an array `coordinates`, `coordinates[i] = [x, y]`, where `[x, y]` represents the coordinate of a point. Check if these points make a straight line in the XY plane.
**Example 1:**
**Input:** coordinates = \[\[1,2\],\[2,3\],\[3,4\],\[4,5\],\[5,6\],\[6,7\]\]
**Output:** true
**Example 2:**
**Input:** coo... | If you draw a graph with the value on one axis and the absolute difference between the target and the array sum, what will you get? That graph is uni-modal. Use ternary search on that graph to find the best value. | Array,Binary Search,Sorting | Medium | null |
1,367 | hey everybody this is away in this video we are going to solve a problem called linked list in a binary tree this is basically a lead good problem number 1367 in this question what we have to do we have we will be given a linked list and what we have to do we have to check that if this linked list exist in our binary t... | Linked List in Binary Tree | maximum-height-by-stacking-cuboids | Given a binary tree `root` and a linked list with `head` as the first node.
Return True if all the elements in the linked list starting from the `head` correspond to some _downward path_ connected in the binary tree otherwise return False.
In this context downward path means a path that starts at some node and goes d... | Does the dynamic programming sound like the right algorithm after sorting? Let's say box1 can be placed on top of box2. No matter what orientation box2 is in, we can rotate box1 so that it can be placed on top. Why don't we orient everything such that height is the biggest? | Array,Dynamic Programming,Sorting | Hard | 2123 |
1,758 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem minimum changes to make alternating binary string another easy problem for us today we're given a string s which consists only of zeros and ones so it's a binary string and we want to make it such that it is alternating... | Minimum Changes To Make Alternating Binary String | distribute-repeating-integers | You are given a string `s` consisting only of the characters `'0'` and `'1'`. In one operation, you can change any `'0'` to `'1'` or vice versa.
The string is called alternating if no two adjacent characters are equal. For example, the string `"010 "` is alternating, while the string `"0100 "` is not.
Return _the **m... | Count the frequencies of each number. For example, if nums = [4,4,5,5,5], frequencies = [2,3]. Each customer wants all of their numbers to be the same. This means that each customer will be assigned to one number. Use dynamic programming. Iterate through the numbers' frequencies, and choose some subset of customers to ... | Array,Dynamic Programming,Backtracking,Bit Manipulation,Bitmask | Hard | null |
781 | all right cool 781 rabbits and forest in the forest each rabbit has some color some subset of rabid possibly all of them tell you how many other rabbits have the same color as them those answers are placed and in the way we turn the minimum number of rabbits that could be in the forest for example you have some sub cem... | Rabbits in Forest | basic-calculator-iv | There is a forest with an unknown number of rabbits. We asked n rabbits **"How many rabbits have the same color as you? "** and collected the answers in an integer array `answers` where `answers[i]` is the answer of the `ith` rabbit.
Given the array `answers`, return _the minimum number of rabbits that could be in the... | One way is with a Polynomial class. For example,
* `Poly:add(this, that)` returns the result of `this + that`.
* `Poly:sub(this, that)` returns the result of `this - that`.
* `Poly:mul(this, that)` returns the result of `this * that`.
* `Poly:evaluate(this, evalmap)` returns the polynomial after replacing all fr... | Hash Table,Math,String,Stack,Recursion | Hard | 736,785 |
1,095 | so hey guys welcome to my Channel today lead code problem is found in mountain array okay it's a lot of description let me explain you this shortly okay uh they give a mountain array what it means by Mountain are like in mountain you have to go up then you find a Peck and then you have to come down just like that in Ar... | Find in Mountain Array | two-city-scheduling | _(This problem is an **interactive problem**.)_
You may recall that an array `arr` is a **mountain array** if and only if:
* `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 ... | null | Array,Greedy,Sorting | Medium | null |
787 | today we will solve another graph problem here you are given a bunch of source and destination and what is the fear of flying a flight between those cities so let's say this is the graph so here uh there is a direct flight from 0 to 1 and its cost is 100 similarly uh there is a flight from 0 to 2 its cost is 500 and we... | Cheapest Flights Within K Stops | sliding-puzzle | There are `n` cities connected by some number of flights. You are given an array `flights` where `flights[i] = [fromi, toi, pricei]` indicates that there is a flight from city `fromi` to city `toi` with cost `pricei`.
You are also given three integers `src`, `dst`, and `k`, return _**the cheapest price** from_ `src` _... | Perform a breadth-first-search, where the nodes are the puzzle boards and edges are if two puzzle boards can be transformed into one another with one move. | Array,Breadth-First Search,Matrix | Hard | null |
252 | Hey hello there today I'm looking at the two meeting rooms question the first one is 252 meeting rooms so we got up a bunch of different meetings each habits on starting 10 times so the input is a list of tuples we want to determine if I can attend all of those meetings so since we are good person so if we decided to a... | Meeting Rooms | meeting-rooms | Given an array of meeting time `intervals` where `intervals[i] = [starti, endi]`, determine if a person could attend all meetings.
**Example 1:**
**Input:** intervals = \[\[0,30\],\[5,10\],\[15,20\]\]
**Output:** false
**Example 2:**
**Input:** intervals = \[\[7,10\],\[2,4\]\]
**Output:** true
**Constraints:**
* ... | null | Array,Sorting | Easy | 56,253 |
141 | Good Morning America today we are going to solve the daily leak code challenge question 141 linked list cycle this is a easy question and you could have a read through it I already took a look at the question and the solution for this problem can be easily solved with two pointers and the Floyd's algorithm oh this ain'... | Linked List Cycle | linked-list-cycle | Given `head`, the head of a linked list, determine if the linked list has a cycle in it.
There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the `next` pointer. Internally, `pos` is used to denote the index of the node that tail's `next` pointer is co... | null | Hash Table,Linked List,Two Pointers | Easy | 142,202 |
1,462 | 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 daughter's I'm coding they've been explanation near the end and for more context there'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 butt... | Course Schedule IV | list-the-products-ordered-in-a-period | There are a total of `numCourses` courses you have to take, labeled from `0` to `numCourses - 1`. You are given an array `prerequisites` where `prerequisites[i] = [ai, bi]` indicates that you **must** take course `ai` first if you want to take course `bi`.
* For example, the pair `[0, 1]` indicates that you have to ... | null | Database | Easy | null |
1,802 | hi friends uh welcome to follow up let's have a look at problem 1802 maximum value at a given index in a bonded array this problem actually is a standard application of binary search so here we are going to explain the thought process first we are given three positive integers in integer and Max of sum and we want to c... | Maximum Value at a Given Index in a Bounded Array | number-of-students-unable-to-eat-lunch | You are given three positive integers: `n`, `index`, and `maxSum`. You want to construct an array `nums` (**0-indexed**) that satisfies the following conditions:
* `nums.length == n`
* `nums[i]` is a **positive** integer where `0 <= i < n`.
* `abs(nums[i] - nums[i+1]) <= 1` where `0 <= i < n-1`.
* The sum of a... | Simulate the given in the statement Calculate those who will eat instead of those who will not. | Array,Stack,Queue,Simulation | Easy | 2195 |
410 | hello friends now less of the blade or a large sum problem there's a statement given ray which consists of non-negative given ray which consists of non-negative given ray which consists of non-negative integers and an integer M you can split array into m non-empty continuous sub array into m non-empty continuous sub ar... | Split Array Largest Sum | split-array-largest-sum | Given an integer array `nums` and an integer `k`, split `nums` into `k` non-empty subarrays such that the largest sum of any subarray is **minimized**.
Return _the minimized largest sum of the split_.
A **subarray** is a contiguous part of the array.
**Example 1:**
**Input:** nums = \[7,2,5,10,8\], k = 2
**Output:*... | null | Array,Binary Search,Dynamic Programming,Greedy | Hard | 1056,1192,2242,2330 |
1,670 | hey everybody this is larry this is me along with q3 of the biweekly contest 40 design fun middle back q uh hit the like button hit the subscribe button join me in discord let me know what you think about this farm i think it's a really cute problem and as usual this these problems require a bit of um figuring out what... | Design Front Middle Back Queue | patients-with-a-condition | Design a queue that supports `push` and `pop` operations in the front, middle, and back.
Implement the `FrontMiddleBack` class:
* `FrontMiddleBack()` Initializes the queue.
* `void pushFront(int val)` Adds `val` to the **front** of the queue.
* `void pushMiddle(int val)` Adds `val` to the **middle** of the queu... | null | Database | Easy | null |
334 | and today we are going to talk about longest triplet subsequence in this particular example one two three can be one of the longest triplet subsequence or it can be one three five or it can be one four five anything for this matter but the whole question is how do you find out the idea to find out is like we keep a var... | Increasing Triplet Subsequence | increasing-triplet-subsequence | Given an integer array `nums`, return `true` _if there exists a triple of indices_ `(i, j, k)` _such that_ `i < j < k` _and_ `nums[i] < nums[j] < nums[k]`. If no such indices exists, return `false`.
**Example 1:**
**Input:** nums = \[1,2,3,4,5\]
**Output:** true
**Explanation:** Any triplet where i < j < k is valid.
... | null | Array,Greedy | Medium | 300,2122,2280 |
142 | welcome to my Channel today let's solve another lead code problem 142 English cycle 2. so continued with the English cycle 1 so cycle 2 is more difficult than cycle one so basically the problem is giving also like that we are giving a linked list and there's a cycle inside a cycle and return the index position of the c... | Linked List Cycle II | linked-list-cycle-ii | Given the `head` of a linked list, return _the node where the cycle begins. If there is no cycle, return_ `null`.
There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the `next` pointer. Internally, `pos` is used to denote the index of the node that ta... | null | Hash Table,Linked List,Two Pointers | Medium | 141,287 |
304 | hello everyone welcome to coding decoded my name is sanchez i am working as technical architect sd4 at adobe and here i present day third of june lead code challenge the question that we have in today's range sum query 2d immutable so here in this question we are given a matrix a size m cross n and we need to identify ... | Range Sum Query 2D - Immutable | range-sum-query-2d-immutable | Given a 2D matrix `matrix`, handle multiple queries of the following type:
* Calculate the **sum** of the elements of `matrix` inside the rectangle defined by its **upper left corner** `(row1, col1)` and **lower right corner** `(row2, col2)`.
Implement the `NumMatrix` class:
* `NumMatrix(int[][] matrix)` Initial... | null | Array,Design,Matrix,Prefix Sum | Medium | 303,308 |
427 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem construct a quad tree so we're given a square Matrix maybe something like this one so it's n by n and we actually want to convert it into a tree but not just a regular like binary tree actually a quad tree where every s... | Construct Quad Tree | construct-quad-tree | Given a `n * n` matrix `grid` of `0's` and `1's` only. We want to represent `grid` with a Quad-Tree.
Return _the root of the Quad-Tree representing_ `grid`.
A Quad-Tree is a tree data structure in which each internal node has exactly four children. Besides, each node has two attributes:
* `val`: True if the node r... | null | null | Medium | null |
1,980 | Hello Everyone, our coding question today is Find Unique Binary String. Now in this question, what is given to us and what do we have to do? First of all, let us understand. Okay, in this question, we have been given a string array, which means its name is the names of that array. Its name is numbers but the data type ... | Find Unique Binary String | faulty-sensor | Given an array of strings `nums` containing `n` **unique** binary strings each of length `n`, return _a binary string of length_ `n` _that **does not appear** in_ `nums`_. If there are multiple answers, you may return **any** of them_.
**Example 1:**
**Input:** nums = \[ "01 ", "10 "\]
**Output:** "11 "
**Explanatio... | Check for a common prefix of the two arrays. After this common prefix, there should be one array similar to the other but shifted by one. If both arrays can be shifted, return -1. | Array,Two Pointers | Easy | null |
20 | hi guys so in this video we'll look at valid patent essence problem so this is a very classical and very typical of a stack problem so let's see what the problem description is so we're given a string and the string is such that it only has characters such as those brackets and we have to determine whether the string i... | 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 |
1,930 | hi everyone today we are going to solve the little question unique lengths of three parenthalamic subsequences so you are given a string s Returns the number of unique palindorms of length 3 that are subsequence of S note that even if there are multiple ways to obtain the same subsequence it is still only counted once ... | Unique Length-3 Palindromic Subsequences | maximum-number-of-consecutive-values-you-can-make | Given a string `s`, return _the number of **unique palindromes of length three** that are a **subsequence** of_ `s`.
Note that even if there are multiple ways to obtain the same subsequence, it is still only counted **once**.
A **palindrome** is a string that reads the same forwards and backwards.
A **subsequence** ... | If you can make the first x values and you have a value v, then you can make all the values ≤ v + x Sort the array of coins. You can always make the value 0 so you can start with x = 0. Process the values starting from the smallest and stop when there is a value that cannot be achieved with the current x. | Array,Greedy | Medium | 330 |
225 | hi in this video i'll show you how to implement stacks using queues so just really quickly a stack looks something like this and if i add values i get 1 two and then three so if i want to pop a value i have to pop out the last value i've added okay while in a queue i just keep it open-ended and if i add i just keep it ... | Implement Stack using Queues | implement-stack-using-queues | Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (`push`, `top`, `pop`, and `empty`).
Implement the `MyStack` class:
* `void push(int x)` Pushes element x to the top of the stack.
* `int pop()` Removes the element on the top... | null | Stack,Design,Queue | Easy | 232 |
1,314 | hi everyone so let's talk about the matrix block sum so you're giving an environmentary an integer k so you have to return a metric a new match would be honest based on the integer k so you can actually graph the element based on i minus k two i plus k j minus k to j plus k so this is the sum of the range based on the ... | Matrix Block Sum | matrix-block-sum | Given a `m x n` matrix `mat` and an integer `k`, return _a matrix_ `answer` _where each_ `answer[i][j]` _is the sum of all elements_ `mat[r][c]` _for_:
* `i - k <= r <= i + k,`
* `j - k <= c <= j + k`, and
* `(r, c)` is a valid position in the matrix.
**Example 1:**
**Input:** mat = \[\[1,2,3\],\[4,5,6\],\[7,8... | null | null | Medium | null |
103 | hey guys welcome to the channel this is wagga we're going to do another question in question is number one zero three binary tree zigzag level or the traversal right so we have a binary tree you're supposed to return it in zigzag level order what that means is um we add the we start off with the root and then we start ... | Binary Tree Zigzag Level Order Traversal | binary-tree-zigzag-level-order-traversal | Given the `root` of a binary tree, return _the zigzag level order traversal of its nodes' values_. (i.e., from left to right, then right to left for the next level and alternate between).
**Example 1:**
**Input:** root = \[3,9,20,null,null,15,7\]
**Output:** \[\[3\],\[20,9\],\[15,7\]\]
**Example 2:**
**Input:** roo... | null | Tree,Breadth-First Search,Binary Tree | Medium | 102 |
84 | Hello hello friends in this section we are going to discuss about how to find largest rectangle in history from this problem like and complexity more simple definitely subscribe problem element representative will withdraw all eggs subscribe in a reader that it is injured gram out of bus required for middle Of the best... | Largest Rectangle in Histogram | largest-rectangle-in-histogram | Given an array of integers `heights` representing the histogram's bar height where the width of each bar is `1`, return _the area of the largest rectangle in the histogram_.
**Example 1:**
**Input:** heights = \[2,1,5,6,2,3\]
**Output:** 10
**Explanation:** The above is a histogram where width of each bar is 1.
The l... | null | Array,Stack,Monotonic Stack | Hard | 85,1918 |
137 | hello friends today we will look at lead code problem number 137 and it's part 2 of single number or version 2. so here the question is that you are given an array of integers and every number occurs three times but one of the numbers occurs just one time so you have to find that single number and it's version 2 becaus... | 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 |
1,901 | hello everyone and welcome back to my channel algorithm HQ today I am going to write the code and also explain you the algorithm for this find a peak element second problem which is there in lead code so let me give you all a small overview of this problem we are given with a matrix with M number of rows and N number o... | Find a Peak Element II | equal-sum-arrays-with-minimum-number-of-operations | A **peak** element in a 2D grid is an element that is **strictly greater** than all of its **adjacent** neighbors to the left, right, top, and bottom.
Given a **0-indexed** `m x n` matrix `mat` where **no two adjacent cells are equal**, find **any** peak element `mat[i][j]` and return _the length 2 array_ `[i,j]`.
Yo... | Let's note that we want to either decrease the sum of the array with a larger sum or increase the array's sum with the smaller sum. You can maintain the largest increase or decrease you can make in a binary search tree and each time get the maximum one. | Array,Hash Table,Greedy,Counting | Medium | 1263 |
304 | hi everyone welcome to the loophead today in this video we will be solving june deetco challenge and the question for today is range sum query 2d immutable the question is medium tagged and it states that given a 2d matrix handle multiple queries of the following type calculate some of the element of matrix inside the ... | Range Sum Query 2D - Immutable | range-sum-query-2d-immutable | Given a 2D matrix `matrix`, handle multiple queries of the following type:
* Calculate the **sum** of the elements of `matrix` inside the rectangle defined by its **upper left corner** `(row1, col1)` and **lower right corner** `(row2, col2)`.
Implement the `NumMatrix` class:
* `NumMatrix(int[][] matrix)` Initial... | null | Array,Design,Matrix,Prefix Sum | Medium | 303,308 |
763 | I am in office amazon friendly this problem create partition but if there will be then prostate gland party subscribe and subscribe not present in the meeting at Chittor Fort but slide subscribe and subscribe The Amazing busy schedule fixed when LED notification subscribe and subscribe the Channel subscribe Who is the ... | 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 |
1,023 | hello hi everyone welcome back to the channel so today in this video lecture will be solving this problem camel case matching so this is yet another problem in the trial series which is a medium problem so let's read it we're given an array of strings queries it contains strings and a string pattern we have to return a... | Camelcase Matching | time-based-key-value-store | Given an array of strings `queries` and a string `pattern`, return a boolean array `answer` where `answer[i]` is `true` if `queries[i]` matches `pattern`, and `false` otherwise.
A query word `queries[i]` matches `pattern` if you can insert lowercase English letters pattern so that it equals the query. You may insert e... | null | Hash Table,String,Binary Search,Design | Medium | 2161 |
213 | Hello everyone welcome to my channel with mike so today we are going to do its video number six before our DP concept ok before starting some speech i.e. before starting some speech i.e. before starting some speech i.e. motivation see everyone face failures everyone face rejection everyone is motivated come some point ... | House Robber II | house-robber-ii | You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are **arranged in a circle.** That means the first house is the neighbor of the last one. Meanwhile, adjacent houses have a security system connected, and **it will automatical... | Since House[1] and House[n] are adjacent, they cannot be robbed together. Therefore, the problem becomes to rob either House[1]-House[n-1] or House[2]-House[n], depending on which choice offers more money. Now the problem has degenerated to the House Robber, which is already been solved. | Array,Dynamic Programming | Medium | 198,256,276,337,600,656 |
20 | to determine if a given set of parentheses is valid this is a very basic problem but at the same time it is very important because it has a lot of different applications and it is asked in a lot of different ways the underlying concept however Remains the Same One such sample problem is available on lead code so let'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 |
49 | another day another problem so let's Solve IT hello beautiful people today we're gonna solve the group anagrams problem so let's start by reading the problem given an array of strings grouped anagrams together you can return the answer and any order so the question give us a list of words or less of string and they ask... | Group Anagrams | group-anagrams | Given an array of strings `strs`, group **the anagrams** together. You can return the answer in **any order**.
An **Anagram** is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.
**Example 1:**
**Input:** strs = \["eat","tea","tan... | null | Hash Table,String,Sorting | Medium | 242,249 |
1,061 | Hello friends, how are you all, hope you all will be very good, so today our question is a medium level question of a lead, inside this question we will have two strings whose lance will be S1 and S2 and one more string will be By doing the best level and inside it, whatever position of S1 and S2 will be there, it will... | Lexicographically Smallest Equivalent String | number-of-valid-subarrays | You are given two strings of the same length `s1` and `s2` and a string `baseStr`.
We say `s1[i]` and `s2[i]` are equivalent characters.
* For example, if `s1 = "abc "` and `s2 = "cde "`, then we have `'a' == 'c'`, `'b' == 'd'`, and `'c' == 'e'`.
Equivalent characters follow the usual rules of any equivalence rela... | Given a data structure that answers queries of the type to find the minimum in a range of an array (Range minimum query (RMQ) sparse table) in O(1) time. How can you solve this problem? For each starting index do a binary search with an RMQ to find the ending possible position. | Array,Stack,Monotonic Stack | Hard | 2233 |
1,071 | hey guys welcome back to my video series on solving Leaf coat problems I'm Alex and this video we're solving 1071 greatest common divisor of strings I already solved it but the video took too long for this I'm recording another video so what's the problem about so for two strings s and t we say t divides s if and only ... | 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 |
502 | hey everyone welcome back and let's write some more neat code today so today let's solve the problem IPO we're given two arrays one array is the profits array and another array is the capital array suppose something like this where we have one two three for our profit values and zero one for Capital we're also given an... | 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 |
1,300 | hey guys welcome back to another video and today we're going to be solving the lead code question sum of mutated area closest to target and this is lead code question 1300 all right so let's just go over the question real quick i know the question itself is a little confusing but then after this i'm going to break it d... | Sum of Mutated Array Closest to Target | critical-connections-in-a-network | Given an integer array `arr` and a target value `target`, return the integer `value` such that when we change all the integers larger than `value` in the given array to be equal to `value`, the sum of the array gets as close as possible (in absolute difference) to `target`.
In case of a tie, return the minimum such in... | Use Tarjan's algorithm. | Depth-First Search,Graph,Biconnected Component | Hard | null |
1,696 | hi everyone happy holiday and today let's solve the weekly contest uh median question jump game six the question statement so we are given an integer array noms and integer k and we are initially standing at index zero and in one move we're able to jump at most k steps forward but cannot jump outside the array boundary... | Jump Game VI | strange-printer-ii | You are given a **0-indexed** integer array `nums` and an integer `k`.
You are initially standing at index `0`. In one move, you can jump at most `k` steps forward without going outside the boundaries of the array. That is, you can jump from index `i` to any index in the range `[i + 1, min(n - 1, i + k)]` **inclusive*... | Try thinking in reverse. Given the grid, how can you tell if a colour was painted last? | Array,Graph,Topological Sort,Matrix | Hard | 664 |
1,825 | hey everybody this is larry this is day q4 of the weekly contest 236 that i'm going over finding mk average um hit the like button hit the subscribe button join me on discord let me know what you think about this problem and in general uh so yeah so for this problem i'm doing the contest i had some issues with reading ... | Finding MK Average | find-minimum-time-to-finish-all-jobs | You are given two integers, `m` and `k`, and a stream of integers. You are tasked to implement a data structure that calculates the **MKAverage** for the stream.
The **MKAverage** can be calculated using these steps:
1. If the number of the elements in the stream is less than `m` you should consider the **MKAverage*... | We can select a subset of tasks and assign it to a worker then solve the subproblem on the remaining tasks | Array,Dynamic Programming,Backtracking,Bit Manipulation,Bitmask | Hard | 2114 |
1,289 | hi guys welcome to my channel and today let's talk about this another dynamic programming problem this one is problem one two eight nine from lead code and so let's solve this problem so here is our problem and i want you to pause this video and just look at the problem and see the example so this problem is another dy... | Minimum Falling Path Sum II | day-of-the-week | Given an `n x n` integer matrix `grid`, return _the minimum sum of a **falling path with non-zero shifts**_.
A **falling path with non-zero shifts** is a choice of exactly one element from each row of `grid` such that no two elements chosen in adjacent rows are in the same column.
**Example 1:**
**Input:** arr = \[\... | Sum up the number of days for the years before the given year. Handle the case of a leap year. Find the number of days for each month of the given year. | Math | Easy | null |
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