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.

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 …

Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Our platform offers a range of essential problems for practice, as well as the latest …

Crack SQL Interview in 50 Qs

A really brute force way would be to search for all possible pairs of numbers but that would be too slow. Again, it's best to try out brute force solutions just for completeness. It is from these …

Can you solve this real interview question? Single Element in a Sorted Array - You are given a sorted array consisting of only integers where every element appears exactly twice, except for …

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? Flatten a Multilevel Doubly Linked List - You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an …

Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level). Example 1: Input: root = [3,9,20 ...

Can you solve this real interview question? Kth Smallest Element in a Sorted Matrix - Given an n x n matrix where each of the rows and columns is sorted in ascending order, return the kth …