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;
}