题解 | 打印日期

#include<bits/stdc++.h>
using namespace std;
int func(int m, int n){
    int arr[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if((m % 4 == 0 && m % 100 != 0) || m % 400 == 0){
        arr[1] = 29;
    }
    int month = 1;
    int day = n;
    for(int i = 0; i < 12; i++){
        if(day > arr[i]){
            month++;
            day -= arr[i];
        }
        else{
            break;
        }
    }
    printf("%04d-%02d-%02d\n", m, month, day);
    return 0;
}
int main(){
    int m, n;
    while(cin >> m >> n){
        func(m, n);
    }
    return 0;
}

输出的时候月份和日期要固定输出两位数，感觉printf()更方便一些