Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.

Enhance your coding abilities and get valuable real-world feedback by participating in contests on LeetCode. You can also win up to 5000 LeetCoins per contest, as well as bonus prizes from …

Enhance your coding skills and prepare for job interviews with LeetCode's study plans.

You are given the head of a linked list, and an integer k. Return the head of the linked list after swapping the values of the k th node from the beginning and the k th node from the end (the …

Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.

Can you solve this real interview question? Word Break - Given a string s and a dictionary of strings wordDict, return true if s can be segmented into a space-separated sequence of one or …

Can you solve this real interview question? Best Time to Buy and Sell Stock II - You are given an integer array prices where prices[i] is the price of a given stock on the ith day. On each day, …

Can you solve this real interview question? Subarray Sum Equals K - Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. A …

Can you solve this real interview question? Missing Number - Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from …

Can you solve this real interview question? Range Sum Query - Immutable - Given an integer array nums, handle multiple queries of the following type: 1. Calculate the sum of the elements …