Kth Divisor

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You are given two integers n and k. Find k-th smallest divisor of n, or report that it doesn't exist. Divisor of n is any such natural number, that n can be divided by it without remainder. Input The first line contains two integers n and k (1 ≤ n ≤ 10^15, 1 ≤ k ≤ 10^9). Output If n has less than k divisors, output -1. Otherwise, output the k-th smallest divisor of n. Sample I

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solution.cppC++17

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