Compilare: main.cpp: In function 'int main()': main.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for (int i=0;i<s.size();i++) per[i]=-1; | ~^~~~~~~~~ main.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for (int i=0;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:27:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for (int i=0;i<s.size();i++) rez+=nr[i]; | ~^~~~~~~~~