1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
#include <iostream>
#include <string>

using namespace std;

int main()
{
    string one(100,'1');
    one[0]='0';
    cout << one << endl;
    one[0]='1';
    one[99]='0';
    string zero(100,'0');
    zero[0]='1';
    cout<<zero<<endl;
    for (int i=1; i<50;i++){
        cout<<one<<endl;
        cout<<zero<<endl;
    }
    return 0;
}