链接:https://ac.nowcoder.com/acm/contest/329#question
I.
怎样都行,要么把它变成全1,要么把它变为全0.
#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
using namespace std;
int main(){
int n;
string a;
scanf("%d",&n);
cin>>a;
cout<<a<<endl;
return 0;
}