Problem You are given two strings s1 and s2 of equal length. A string swap is an operation where you choose two indices in a ...

Problem Given an integer array nums that may contain duplicates, return all possible subsets (the power set). A subset of an...

Problem Given an integer array nums of unique elements, return all possible subsets (the power set). A subset of an array is...

Problem Given an array of positive integers nums, return the maximum possible sum of an ascending subarray in nums. A subarra...

Problem Given an array of integers nums, half of the integers in nums are odd, and the other half are even. Sort the array so...

Problem Given an integer array nums, move all the even integers at the beginning of the array followed by all the odd integer...

Problem You are given an array of integers nums. Return the length of the longest subarray of nums which is either strictly i...

Problem Given a string s, return true if the s can be palindrome after deleting at most one character from it. https://leetco...

Problem Given an array nums, return true if the array was originally sorted in non-decreasing order, then rotated some number...

Problem 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] mean...

Problem There is an integer array nums sorted in non-decreasing order (not necessarily with distinct values). Before being pa...

Problem You are given an n x n binary matrix grid. You are allowed to change at most one 0 to be 1. Return the size of the la...

Problem Given a string s and an integer k, reverse the first k characters for every 2k characters counting from the start of ...

Problem Write a function that reverses a string. The input string is given as an array of characters s. You must do this by m...

Problem Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must appe...

Problem Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must be u...

Problem Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such...

Problem Given an integer numRows, return the first numRows of Pascal’s triangle. In Pascal’s triangle, each number is the sum...

Problem You are given a 0-indexed 2D matrix grid of size m x n, where (r, c) represents: A land cell if grid[r][c] = 0, or A...

Problem Given an integer rowIndex, return the rowIndexᵗʰ (0-indexed) row of the Pascal’s triangle. In Pascal’s triangle, each...

Problem There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array pr...

Problem You are given a 0-indexed array of integers nums of length n. You are initially positioned at nums[0]. Each element n...

Problem You are given a 0-indexed array of positive integers nums and a positive integer limit. In one operation, you can cho...

Problem You are given a 0-indexed 2D integer array transactions, where transactions[i] = [costᵢ, cashbackᵢ]. The array descri...

Problem There exists an undirected tree rooted at node 0 with n nodes labeled from 0 to n - 1. You are given a 2D integer arr...

Problem You are given a map of a server center, represented as a m * n integer matrix grid, where 1 means that on that cell t...

Problem There are 3n piles of coins of varying size, you and your friends will take piles of coins as follows: In each step,...

Problem You are given a 0-indexed 2D array grid of size 2 x n, where grid[r][c] represents the number of points at position (...

Problem There are n piles of coins on a table. Each pile consists of a positive number of coins of assorted denominations. In...

Problem You are given a 0-indexed integer array arr, and an m x n integer matrix mat. arr and mat both contain all the intege...

Problem Given an integer array nums of size n, return the number with the value closest to 0 in nums. If there are multiple a...

Problem Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water ...