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] = [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 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...

Problem You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-l...

Problem You are given the heads of two sorted linked lists list1 and list2. Merge the two lists into one sorted list. The lis...

Problem Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input str...

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 You are given a binary string s and an integer k. You are also given a 2D integer array queries, where queries[i] = [...

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 an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is mi...

Problem 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 l...

Problem You are given a binary string s and an integer k. A binary string satisfies the k-constraint if either of the followi...

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

Problem Given a wooden stick of length n units. The stick is labelled from 0 to n. For example, a stick of length 6 is labell...

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 ...