题解 | 今年的第几天？

#include <stdio.h>
int isLeapyear(year){
    if(((year%4==0)&&(year%100!=0)) || (year%400==0)){
        return 1;
    }else{
        return 0;
    }
}

int is_today(int year, int month, int day){
    int month_days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int days = 0;
    // 月
    for(int i=0; i<month; i++){
        if(i==2){
            days += isLeapyear(year)==1 ? 29 : month_days[i];
            continue;
        }
        days += month_days[i];
    }
    // 天
    days += day;

    return days;
}

int main() {
    int year, month, day;
    while(scanf("%d %d %d", &year, &month, &day) != EOF){
        int is_today_value = is_today(year, month, day);
        printf("%d\n", is_today_value);
    }
    return 0;
}