Compilare: main.cpp: In function 'int get_parantheses_expression_left(const std::string&, int)': main.cpp:29:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (i = left; expression[i] != ')' && i < expression.size(); i++) {} | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:31:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if (i == expression.size()) return -1; | ~~^~~~~~~~~~~~~~~~~~~~