Compilare: main.cpp: In function 'int calc(int)': main.cpp:51:7: warning: unused variable 'add' [-Wunused-variable] 51 | int add = 0; | ^~~ main.cpp: In function 'int main()': main.cpp:88:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for (int i = 0; i < pct.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:95:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for (int j = i + 1; j < s.size(); ++j) | ~~^~~~~~~~~~