代码模板

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#include <bits/stdc++.h>
using namespace std;
#define lowbit(x) (x)&(-x)
#define lson(x) ((x)<<1)
#define rson(x) (lson(x)+1)
#ifdef LCYTEST
#define test(x) {x}
#else
#define test(x) {;}
#endif

int main(){
}