Shared code

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
  cin.tie(0)->sync_with_stdio(0);
  int n, k;
  cin >> n >> k;
  vector<int> vi(n);
  for (auto &a : vi) {
    string s;
    cin >> s;
    for (int i = 0; i < k; i++) {
      a += (s[i] == '1') * (1 << i);
    }
  }

  int mini = k;
  for (int i = 0; i < n; i++) {
    for (int j = i + 1; j < n; j++) {
      mini = min(mini, (int)__builtin_popcount(vi[i] ^ vi[j]));
    }
  }
  cout << mini << "\n";
}