1336. Single Number II — Element Appears Three Times

Given an array where every element appears exactly three times except for one element that appears once, find the element that appears once.

Input: A JSON object {"nums": [<integers>]} where all but one value appear three times.

Output: Return the element appearing exactly once.

Examples

Example 1

Input: {"nums":[2,2,3,2]}
Output: 3
Explanation: 2 appears three times, so 3 is the answer.

Example 2

Input: {"nums":[0,1,0,1,0,1,99]}
Output: 99
Explanation: 0 and 1 each appear three times -> 99.