快速求某年某月是第几天（未整理）

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    int n,y,m,d,c,w,t;
    cin>>t;
    while(t--)
    {
        cin>>y>>m>>d;
        if(m<=2)
        {
            m+=12;
            y=y-1;
        }
        c=y/100;
        y=y%100;
        w=c/4-2*c+y+y/4+13*(m+1)/5+d-1;
        w%=7;
        if(w<=0) w+=7;
        cout<<w<<endl;
    }
    return 0;
}