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.

Login to LeetCode Online Interview Login with LeetCode account or register

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 brute force …

Can you solve this real interview question? Isomorphic Strings - Given two strings s and t, determine if they are isomorphic. Two strings s and t are isomorphic if the characters in s can be replaced to get …

Can you solve this real interview question? Search in Rotated Sorted Array II - There is an integer array nums sorted in non-decreasing order (not necessarily with distinct values). Before being passed to …

Can you solve this real interview question? Edit Distance - Given two strings word1 and word2, return the minimum number of operations required to convert word1 to word2. You have the following three …

Can you solve this real interview question? Add Digits - Given an integer num, repeatedly add all its digits until the result has only one digit, and return it. Example 1: Input: num = 38 Output: 2 …

The actual trick comes when trying to solve this problem without using any additional memory. This means you need to use the original array somehow to move the elements around. Now, we can …

Can you solve this real interview question? Longest Repeating Character Replacement - You are given a string s and an integer k. You can choose any character of the string and change it to any other …

Can you solve this real interview question? Add Two Numbers - You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their …