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Help with an interesting problem? Looks straightforward but I failed to do it today during online assessment.
Constraints:
Size of the array: [1 10^5]
Element: 1 <= a[i] <= 10^6
Brute force won't work because of the constraints. I tried thinking of various ways but all were convoluted. I feel there is an easier way to think about it but I am missing some observation.
Any help would be highly appreciated.
Thanks!
