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Simple question but can we do it w/o using any map in O(n)?
HELLO CF community i'm wondering can we solve below problem w/o using map in O(n)? constraint n < 1e5 & |a[i]| < 1e9
Given an array of integers, 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.
