题解 | #打印日期#

#include <iostream>
#include <iomanip>
using namespace std;
int IsLeapY(int y){
    if(y%400==0 || (y%4==0 && y%100!=0)) return 1;
    else return 0;
}
int day[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}};

int main() {
    int y,d;
    while(cin>>y>>d){
        int i=1;
        int f=IsLeapY(y);
        while(d>day[f][i]){
            d-=day[f][i];
            i++;
        }
        cout<<y<<'-'<<setw(2)<<setfill('0')<<i<<'-'<<setw(2)<<setfill('0')
        <<d<<endl;
    }
}