/in/foo.cc: In function 'bool IF(int)':
/in/foo.cc:12:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |         for (int i = 0; i < A.size() / 2; i++)
      |                         ~~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:34:27: warning: statement has no effect [-Wunused-value]
   34 |                         a / 10;
      |                         ~~^~~~