func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MX = 25;   int main(int argc, char *argv[]) {     int n, k;     cin >> n >> k;     string a[n];     for (int i = (0), _b = (n); i < (_b); ++i) cin >> a[i];     uint8_t g[4];     uint32_t b[n];     for (int i = (0), _b = (n); i < (_b); ++i) {       uint8_t x = 0;       int idx = 0;       for (int j = (0), _b = (a[i].length()); j < (_b); ++j) {         if (a[i][j] ==  . ) {           g[idx] = x;           x = 0;           ++idx;         } else           x = x * 10 + a[i][j] -  0 ;       }       g[idx] = x;       b[i] = (g[0] << 24) | (g[1] << 16) | (g[2] << 8) | g[3];     }     uint32_t mask = 0xffffffff;     uint32_t ans = 0;     while (mask) {       set<uint32_t> s;       for (int i = (0), _b = (n); i < (_b); ++i) s.insert(b[i] & mask);       if (s.size() == k) ans = mask;       mask <<= 1;     }     if (!ans)       cout << -1 << endl;     else {       uint8_t a0 = (ans >> 24) & 0xff;       uint8_t a1 = (ans >> 16) & 0xff;       uint8_t a2 = (ans >> 8) & 0xff;       uint8_t a3 = ans & 0xff;       printf( %d.%d.%d.%d n , a0, a1, a2, a3);     }     return 0;   }   