题解 | #今年的第几天？#

#include<cstdio>
int main(){
    int year,month,day;
    int mon[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    while(scanf("%d%d%d",&year,&month,&day)!=EOF){
        int month_day_sum=0;
        int day_sum=0;
        if(year%400==0 || year%100!=0 && year%4==0) {
            mon[2] = 29;
        }
        for(int i=0;i<month;++i){
            month_day_sum+=mon[i];
        }
        day_sum=month_day_sum+day;
        printf("%d\n",day_sum);
    }
}