Compilare: main.cpp: In function 'bool Calc(std::string)': main.cpp:10:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for(int i = 0; i < c.size(); i++) { | ~~^~~~~~~~~~ main.cpp:26:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 26 | if(c.size() > n) return false; | ~~~~~~~~~^~~ main.cpp:28:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 28 | return (c.size() == n); | ~~~~~~~~~^~~~