Compilare: main.cpp: In function 'int main()': main.cpp:21:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int i = 0 ; i < s.size() ; i ++) | ~~^~~~~~~~~~ main.cpp:32:48: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 32 | if (st.top() == digit && st.size() <= m) | ~~~~~~~~~~^~~~