Non-Duplicated-Algo

Single Number 2 - All elements except one occur thrice

Problem Given an integer array nums where every element appears three times except for one, which appears exactly once. Find the single element and return it. You must implement a solution with a linear runtime complexity and use only constant extra space. Examples Example 1: Input : nums = [1, 2, 4, 3, 3, 2, 2, 3, 1, 1] Output : 4 ...

First Unique Character in a String

Find First Unique Character in a String Problem Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Examples Example 1: Input: s = "leetcode" Output: 0 Example 2: Input: s = "loveleetcode" Output: 2 ...