Web Reference: Jul 15, 2025 · Given an array of integers arr [], The task is to find the index of first repeating element in it i.e. the element that occurs more than once and whose index of the first occurrence is the smallest. There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and using only constant extra space. Given an integer array A of size N, find the first repeating element in it. We need to find the element that occurs more than once and whose index of first occurrence is smallest. If there is no repeating element, return -1.
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