T008 第几天

#include<stdio.h>

int main()
{
    int year, month, day, sum=0, i;
    int mon[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    scanf("%d-%d-%d", &year, &month, &day);
    if(year%400==0||year%4==0&&year%100!=0) mon[2]=29;//判断闰年
    else mon[2]=28;
    for(i=0;i<month;i++)
    {
        sum+=mon[i];
    }
    sum+=day;
    printf("%d", sum);
    return 0;
}