func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 100010;   int n, m;   map<int, bool> ma, mb;   int a[maxn], b[maxn];   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= n; i++) {       scanf( %d , &a[i]);       if (ma[a[i]] == true) {         printf( 0 n );         return 0;       }       ma[a[i]] = true;     }     int ans = 3;     for (int i = 1; i <= n; i++) {       b[i] = (a[i] & m);       if (ma[b[i]] == true && a[i] != b[i]) {         ans = min(ans, 1);         break;       }       if (mb[b[i]] == true) {         ans = min(ans, 2);       }       mb[b[i]] = true;     }     if (ans == 3) ans = -1;     printf( %d n , ans);     return 0;   }   