思考

不考虑闰年的话，就考虑输入的是月末和年末两种边界情况了

#include <iostream>
#include <cstdio>

using namespace std;

int monthtab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};

class Date{
private:
    int year,month,day;
public:
    void printf_Date(){
        scanf("%d %d %d",&year,&month,&day);
        if((month==12)&&(day==31)){
            year++;month=1;day=1;
        }
        if(day+1>monthtab[month]){
            month++;
            day=1;
        }else{
            day++;
        }
        printf("%4d-%02d-%02d\n",year,month,day);
    }
};

int main(){
    int times=0;
    scanf("%d",&times);
    while(times--){
        Date your_date;
        your_date.printf_Date();
    }
}