func_code_string: #include <bits/stdc++.h>   using namespace std;   string A[15];   long long nr[100];   int N, K;   long long mn = 1000000000;   int main() {     scanf( %d %d n , &N, &K);     for (int i = 1; i <= N; i++) cin >> A[i];     vector<int> v;     for (int i = 1; i <= K; i++) v.push_back(i);     do {       for (int i = 1; i <= N; i++) {         nr[i] = 0;         for (int j = 0; j < K; j++) nr[i] = nr[i] * 10 + (A[i][v[j] - 1] -  0 );       }       sort(nr + 1, nr + N + 1);       mn = min(mn, nr[N] - nr[1]);     } while (next_permutation(v.begin(), v.end()));     cout << mn;     return 0;   }   