Leetcode•Feb 11, 2026
N-Repeated Element in Size 2N Array
Hazrat Ali
Leetcode
You are given an integer array nums with the following properties:
nums.length == 2 * n.numscontainsn + 1unique values,nof which occur exactly once in the array.- Exactly one element of
numsis repeatedntimes.
Return the element that is repeated n times.
Example 1:
Input: nums = [1,2,3,3] Output: 3
Example 2:
Input: nums = [2,1,2,5,3,2] Output: 2
Example 3:
Input: nums = [5,1,5,2,5,3,5,4] Output: 5
Solution
var repeatedNTimes = function(nums) {
let seen = new Set();
for (let num of nums) {
if (seen.has(num)) {
return num;
}
seen.add(num);
}
};