Problem You are given an array of non-overlapping intervals intervals where intervals[i] = [startᵢ, endᵢ] represent the start...

Problem Given an array of intervals where intervals[i] = [startᵢ, endᵢ], merge all overlapping intervals, and retur...

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 Given an array of intervals intervals where intervals[i] = [startᵢ, endᵢ], return the minimum number of intervals you...

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

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

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 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...

Problem Given the head of a linked list, remove the nᵗʰ node from the end of the list and return its head. https://leetcode.c...

Problem You are given the head of a singly linked-list. The list can be represented as: L0 → L1 → … → Ln - 1 → Ln Reorder t...

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

Problem Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k...

Problem Given a string s and a dictionary of strings wordDict, return true if s can be segmented into a space-separated seque...

Problem You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of th...

Problem Given a string s, return the number of palindromic substrings in it. A string is a palindrome when it reads the same ...

Problem Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph. Each node in th...

Problem Given a string s, return the longest palindromic substring in s. A string is palindromic if it reads the same forwar...

Problem You are given a sorted array consisting of only integers where every element appears exactly twice, except for one el...

Problem Given a string s, find the length of the longest substring without repeating characters. A substring is a contiguous...

Problem Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. You must wr...