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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 …

Can you solve this real interview question? Valid Parentheses - Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid …

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Can you solve this real interview question? Palindrome Number - Given an integer x, return true if x is a palindrome, and false otherwise. Example 1: Input: x = 121 Output: true Explanation: …

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 …

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, …