func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 18;   long long dp[(1 << N)][105];   string n;   int qwq;   int m, pw[20];   bool used[10];   void init() {     pw[0] = 1;     for (int i = 1; i <= n.size(); i++) pw[i] = pw[i - 1] * 10 % m;   }   int main() {     cin >> n >> m;     dp[0][0] = 1;     init();     for (int i = 1; i < (1 << n.size()); i++) {       int sz = n.size() - __builtin_popcount(i);       for (int k = 0; k < m; k++) {         for (int j = 0; j < 10; j++) used[j] = false;         for (int j = 0; j < n.size(); j++)           if (((i >> j) & 1) && !used[n[j] -  0 ])             if (sz != (int)n.size() - 1 || n[j] !=  0 )               dp[i][k] +=                   dp[i - (1 << j)][(m + k - (n[j] -  0 ) * pw[sz] % m) % m],                   used[n[j] -  0 ] = true;       }     }     cout << dp[(1 << n.size()) - 1][0] <<   n ;     return 0;   }   