Compilare: main.cpp: In function 'int main()': main.cpp:52:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(j = 0; j<s.size(); j++) | ~^~~~~~~~~ main.cpp:55:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while(s[j] >= '0' && s[j] <= '9' && j<s.size()) | ~^~~~~~~~~ main.cpp:64:54: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | while(s[j] >= '0' && s[j] <= '9' && j<s.size()) | ~^~~~~~~~~