This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int N = 1<< 18;
int n,k,t,s;
string ss;
bool used[N];
int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> n >> k >> t >> ss;
	for(int i = 0;i < n;i++) if(ss[i]=='1') s+=(1 << i);
	cout << (1 << n) << '\n' << ss << '\n';
	used[s] = true;
	for(int i = 1;i < (1 << n);i++)
	{
		for(int j = 0;j < n;j++) for(int k = j+1;k < n;k++) for(int l = k+1;l < n;l++)
		{
			int t = s^(1 << j)^(1 << k)^(1 << l);
			if(!used[t]){ s = t; break; }
		}
		used[s] = true;
		for(int j = 0;j < n;j++) cout << (bool)((1 << j)&s);
		cout << '\n';
	}
}
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