Question Link : https://leetcode.com/problems/longest-consecutive-sequence/

Difficulty: Medium

Premium: False

Question

Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. You must write an algorithm that runs in O(n) time.   Example 1:

Input: nums = [100,4,200,1,3,2] Output …

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Question Link : https://leetcode.com/problems/happy-number/

Difficulty: Easy

Premium: False

Question

Write an algorithm to determine if a number n is happy. A happy number is a number defined by the following process:

Starting with any positive integer, replace the number by the sum of the squares of its …

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Question Link : https://leetcode.com/problems/contains-duplicate/

Difficulty: Easy

Premium: False

Question

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.   Example 1:

Input: nums = [1,2,3,1] Output: true Explanation: The element …

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Question Link : https://leetcode.com/problems/jewels-and-stones/

Difficulty: Easy

Premium: False

Question

You're given strings jewels representing the types of stones that are jewels, and stones representing the stones you have. Each character in stones is a type of stone you have. You want to know how many of the …

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