Compilare: main.cpp: In function 'int main()': main.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i = lim; i < str.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:35:26: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare] 35 | while(ans.size() > lim) { | ~~~~~~~~~~~^~~~~