Find First Repeating Element

Given an array of integers, find the first element that repeats. If no element repeats, return -1. Input Format: - The first line contains a single integer n (1 <= n <= 10^5), the size of the array. - The second line contains n integers, separated by spaces, representing the elements of the array. Output Format: - Print the first repeating element or -1 if there is no repeating element. Example: Input: 7 5 3 4 3 5 1 2 Output: 3