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.

LeetCode Explore is the best place for everyone to start practicing and learning on LeetCode. No matter if you are a beginner or a master, there are always new topics waiting for you to explore.

Must-do List for Interview Prep 150 Original & Classic Questions Covers comprehensive interview topics Best for 3+ months of prep time Problems support high-quality editorials

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

Login to LeetCode Online Interview Login with LeetCode account or register

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.

Join LeetCode Discuss for coding insights, learning opportunities, and networking with fellow programmers in a vibrant community.

Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j ...

Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head = [1,2,3,4,5] Output: [5,4,3,2,1] Example 2: Input: head = [1,2] Output: [2,1] Example 3: Input: …