48. Rotate Image
Problem You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotat...
825. Friends Of Appropriate Ages
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...
300. Longest Increasing Subsequence
Problem Given an integer array nums, return the length of the longest strictly increasing subsequence. A subsequence is an a...
424. Longest Repeating Character Replacement
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...
3240. Minimum Number of Flips to Make Binary Grid Palindromic II
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...
417. Pacific Atlantic Water Flow
Problem There is an m x n rectangular island that borders both the Pacific Ocean and Atlantic Ocean. The Pacific Ocean touche...
33. Search in Rotated Sorted Array
Problem There is an integer array nums sorted in ascending order (with distinct values). Prior to being passed to your functi...
153. Find Minimum in Rotated Sorted Array
Problem Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums ...
3239. Minimum Number of Flips to Make Binary Grid Palindromic I
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...
152. Maximum Product Subarray
Problem Given an integer array nums, find a subarray that has the largest product, and return the product. A subarray is a c...
19. Remove Nth Node From End of List
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...
143. Reorder List
Problem You are given the head of a singly linked-list. The list can be represented as: L0 → L1 → … → Ln - 1 → Ln Reorder t...
3249. Count the Number of Good Nodes
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...
15. 3Sum
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...
139. Word Break
Problem Given a string s and a dictionary of strings wordDict, return true if s can be segmented into a space-separated seque...
11. Container With Most Water
Problem You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of th...
647. Palindromic Substrings
Problem Given a string s, return the number of palindromic substrings in it. A string is a palindrome when it reads the same ...
133. Clone Graph
Problem Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph. Each node in th...
5. Longest Palindromic Substring
Problem Given a string s, return the longest palindromic substring in s. A string is palindromic if it reads the same forwar...
540. Single Element in a Sorted Array
Problem You are given a sorted array consisting of only integers where every element appears exactly twice, except for one el...
3. Longest Substring Without Repeating Characters
Problem Given a string s, find the length of the longest substring without repeating characters. A substring is a contiguous...
128. Longest Consecutive Sequence
Problem Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. You must wr...