히농의 잡합다식

이산로그 (Dicrete Logarithm) 와 관련된 문제를 푸는 도중 매우 난감한 문제를 만났다. https://www.acmicpc.net/problem/21094 21094번: Discrete Logarithm is a Joke $M = 10^{18} + 31$ is a prime number. $g = 42$ is a primitive root modulo $M$, which means that $g^{1} \bmod M, g^{2} \bmod M, \ldots, g^{M-1} \bmod M$ are all distinct integers from $[1; M)$. Let's define a function $f(x)$ as the smallest positive integer www.acmic..