[백준] 16199번 : 나이 계산하기 - C++

https://www.acmicpc.net/problem/16199

#include <iostream>

using namespace std;

int main() {
    int y,m,d,y1,m1,d1;
    cin>>y>>m>>d>>y1>>m1>>d1;
    
    int sum=0;
    if(m<m1) sum=y1-y;
    else if(m==m1 && d<=d1) sum=y1-y;
    else sum=y1-y-1;
        
    cout<<sum<<"\n";
    cout<<y1-y+1<<"\n";
    cout<<y1-y;
}