这个比1246数据要强，考虑了闰年的情况

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int y,m,d;
    char c;
    while(cin>>y>>c>>m>>c>>d)
    {
        int sum;
        if((y%100==0&&y%400==0)||(y%100!=0&&y%4==0))
        sum=1;
        else
        sum=0;
        switch(m)
        {
            case 1:
                sum=d;
                cout<<sum<<endl;
                break;
            case 2:
                sum=31+d;
                cout<<sum<<endl;
                break;
            case 3:
                sum+=31+28+d;
                cout<<sum<<endl;
                break;
            case 4:
                sum+=31+28+31+d;
                cout<<sum<<endl;
                break;
            case 5:
                sum+=31+28+31+30+d;
                cout<<sum<<endl;
                break;
            case 6:
                sum+=31+28+31+30+31+d;
                cout<<sum<<endl;
                break;
            case 7:
                sum+=31+28+31+30+31+30+d;
                cout<<sum<<endl;
                break;
            case 8:
                sum+=31+28+31+30+31+30+31+d;
                cout<<sum<<endl;
                break;
            case 9:
                sum+=31+28+31+30+31+30+31+31+d;
                cout<<sum<<endl;
                break;
            case 10:
                sum+=31+28+31+30+31+30+31+31+30+d;
                cout<<sum<<endl;
                break;
            case 11:
                sum+=31+28+31+30+31+30+31+31+30+31+d;
                cout<<sum<<endl;
                break;
            case 12:
                sum+=31+28+31+30+31+30+31+31+30+31+30+d;
                cout<<sum<<endl;
                break;
        }
    }
    return 0;
}