题解 | #今年的第几天？#

#include<bits/stdc++.h>
using namespace std;

int Isleapyear(int y)   //判断是否为闰年
{
    return ((y%100!=0&&y%4==0)||(y%400==0));
}

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}};   //预处理

int main()
{
    int year,month,day;
    while(scanf("%d %d %d",&year,&month,&day)!=EOF)
    {
        int k=0;
        int row=Isleapyear(year);   //判断用daytab中的哪一行
        for(int j=0;j<month;j++)
        {
            k=k+daytab[row][j];
        }
        k=k+day;
        printf("%d\n",k);
    }
    return 0;
}