东方博宜 1963. 贝贝的选择

#include<iostream>
using namespace std;
int main()
{int n ;cin >> n ;int cnt ;cnt = 0 ;for(int i = 1 ; i <= n ; i++){int j ;j = i ;int g ;while(j>0){g = j % 10 ;if (g==6){cnt += 1 ;break ;}j = j / 10 ;	}}if (cnt % 2 == 0)cout << "playground" ;elsecout << "library" ;return 0 ;
}