Compilare: main.cpp: In function 'int cost(std::__cxx11::string)': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < muchii.size(); i++){ ~~^~~~~~~~~~~~~~~