func_code_string: #include <bits/stdc++.h>   int n, m, a, b, mna = 101, mnb = 101, mxa, mxb;   void No() { printf( -1 ); }   void Yes(int n) { printf( %d , n); }   int main() {     scanf( %d%d , &n, &m);     for (int i = 0; i < n;          i++, scanf( %d , &a), mna = std::min(mna, a), mxa = std::max(mxa, a))       ;     for (int i = 0; i < m; i++, scanf( %d , &b), mnb = std::min(mnb, b))       ;     mxa = std::max(mxa, 2 * mna);     if (mxa >= mnb)       No();     else       Yes(mxa);     return 0;   }   