题解 | 今年的第几天？

#include <stdio.h>

int months[12]={31,28,31,30,31,30,31,31,30,31,30,31};

typedef struct{
    int year;
    int month;
    int day;
}Day;

int DayOfYear(Day d);

int main() {
    int year, month ,day;
    while (scanf("%d %d %d", &year, &month, &day) != EOF) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to 
        Day d;d.year=year;d.month=month;d.day=day;
        printf("%d\n",DayOfYear(d));
    }
    return 0;
}

int DayOfYear(Day d){
    int state=0,days=0;// 是否闰年
    if(d.year%400==0||d.year%4==0&&d.year%100)state=1;
    for(int m=1;m<d.month;m++){
        days+=months[m-1];
    }
    days+=d.day;
    if(state&&d.month>2) days+=1;
    return days;
}