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D 简单的数论题
https://www.51nod.com/Contest/Problem.html#contestProblemId=4854 SB 卡我常 #include <bits/stdc++.h> #define int ll #define ll long long #define pb push_back using namespace std; const int mod=998244353; ll fpow(int x,int y) { ll res=1; x%=mod; while(