func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize(2)   using namespace std;   inline int read() {     char c = getchar();     int x = 0;     bool f = 0;     for (; !isdigit(c); c = getchar()) f ^= !(c ^ 45);     for (; isdigit(c); c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48);     if (f) x = -x;     return x;   }   int n, m, a[205], b[205], res;   vector<int> v[205], tmp[205];   signed main() {     n = read(), m = read();     for (register int i = (1); i <= (n); ++i) a[i] = read();     for (register int i = (1); i <= (m); ++i) b[i] = read();     for (register int i = (1); i <= (n); ++i)       for (register int j = (1); j <= (m); ++j) v[i].push_back(j);     for (register int p = (9); p >= (0); --p) {       bool ok = 1;       for (register int i = (1); i <= (n); ++i) {         int x = a[i];         if (!(x >> p & 1)) continue;         tmp[i].clear();         for (int j = 0; j < v[i].size(); ++j) {           int y = b[v[i][j]];           if (!(y >> p & 1)) tmp[i].push_back(v[i][j]);         }         if (tmp[i].size() == 0) {           ok = 0;           break;         }       }       if (!ok)         res += (1 << p);       else         for (register int i = (1); i <= (n); ++i)           if (a[i] >> p & 1) v[i] = tmp[i];     }     cout << res;     return 0;   }   