题解 | #今年的第几天？#

#include <stdio.h>

int daytab[2][13]={
    {0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}
};
_Bool IsLeapYear(int year){
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}

int main() {
    int year, month,day;
    while (scanf("%d %d %d", &year, &month, &day) != EOF) { 
        int number = 0 ;
        int row = IsLeapYear(year);
        for (int j = 0;j < month;++j){
            number += daytab[row][j];
        }
        number += day;
        printf("%d\n", number);
    }
    return 0;
}