Problem Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0’s. You must do it in pla...

Problem Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islan...

Problem There is a snake in an n x n matrix grid and can move in four possible directions. Each cell in the grid is identifie...

Problem 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 ...

Problem You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed...

Problem You are given an integer n and a 2D integer array queries. There are n cities numbered from 0 to n - 1. Initially, th...

Problem You are given an integer array coins representing coins of different denominations and an integer amount representing...

Problem Given a positive integer n, write a function that returns the number of set bits in its binary representation (also k...

Problem Reverse bits of a given 32 bits unsigned integer. Note: Note that in some languages, such as Java, there is no unsig...

Problem You are given an integer n and a 2D integer array queries. There are n cities numbered from 0 to n - 1. Initially, th...

Problem There is a robot on an m x n grid. The robot is initially located at the top-left corner (i.e., grid[0][0]). The robo...

Problem Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structu...

Problem You are given an array of non-overlapping intervals intervals where intervals[i] = [start_i, end_i] represent the sta...

Problem Given an array of intervals where intervals[i] = [start_i, end_i], merge all overlapping intervals, and return an arr...

Problem You are given an integer array nums. You are initially positioned at the array’s first index, and each element in the...

Problem Given an m x n matrix, return all elements of the matrix in spiral order. https://leetcode.com/problems/spiral-matrix...

Problem Given an integer array nums, find the subarray with the largest sum, and return its sum. A subarray is a contiguous ...

Problem An image smoother is a filter of the size 3 x 3 that can be applied to each cell of an image by rounding down the ave...

Problem Given an array of intervals intervals where intervals[i] = [start_i, end_i], return the minimum number of intervals y...

Problem Given an array of strings strs, group the anagrams together. You can return the answer in any order. An Anagram is a...

Problem You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotat...

Problem Given an integer array nums, return the length of the longest strictly increasing subsequence. A subsequence is an a...

Problem There are n persons on a social media website. You are given an integer array ages where ages[i] is the age of the i^...

Problem Serialization is the process of converting a data structure or object into a sequence of bits so that it can be store...

Problem You are given a string s and an integer k. You can choose any character of the string and change it to any other uppe...

Problem The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value,...

Problem You are given an m x n binary matrix grid. A row or column is considered palindromic if its values read the same forw...

Problem There is an m x n rectangular island that borders both the Pacific Ocean and Atlantic Ocean. The Pacific Ocean touche...

Problem There is an integer array nums sorted in ascending order (with distinct values). Prior to being passed to your functi...

Problem Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums ...

Problem You are given an m x n binary matrix grid. A row or column is considered palindromic if its values read the same forw...

Problem Given an integer array nums, find a subarray that has the largest product, and return the product. A subarray is a c...