歐拉定理

#include<bits/stdc++.h> #define rep(i,a,b) for(ll i=(a);i<=(b);i++) #define per(i,a,b) for(ll i=(a);i>=(b);i--) #define ll long long using namespace std; const ll N=2e6; ll flag,mod,a,m,b; ll read(){

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