foo.cc: In function 'int findmax(std::vector<int>&)':
foo.cc:17:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         for (int i = 0; i<a.size(); i++)
      |                         ~^~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:42:29: error: 'sqrt' was not declared in this scope
   42 |         cout << max <<" "<< sqrt(min);
      |                             ^~~~

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