常用头文件

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#include<iostream> #include<cstdio> #include<string> #include<cstring> #include<cmath> #include<algorithm> #include<stack> #include<queue> #include<vector> #include<set> #include<map> #define INF 0x3f3f3f3f #define LL long long   using namespace std; #define IOS std::ios::sync_with_stdio(false);std::cin.tie(0); const int N =100 ;    signed main(){     IOS  }