题解 | #日期类#

#include <iostream>
using namespace std;
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}
};
int IsRunNian(int y) {
	return ((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0));
}
int main() {
    int n;
    cin>>n;
    while(n--){
        int year,month,day;
        cin>>year>>month>>day;
        int a = IsRunNian(year);
        if(day==daytab[a][month]){
            month += 1;
            if(month>12){
                year += 1;
                month = 1;
                day = 1;
            }
            day = 1;
        }else{
            day += 1;
        }
        if(month<=9 && day<=9){
            cout<<year<<"-0"<<month<<"-0"<<day<<endl;
        }else if(month<=9 && day>9){
            cout<<year<<"-0"<<month<<"-"<<day<<endl;
        }else if(month>9 && day<=9){
            cout<<year<<"-"<<month<<"-0"<<day<<endl;
        }else{
            cout<<year<<"-"<<month<<"-"<<day<<endl;
        }     
    }
}