Compilare: main.cpp: In function 'int main()': main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(j=0;j<s.size()-1;j++) add(s.substr(j)); | ~^~~~~~~~~~~ main.cpp:60:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(j=0;j<s.size()-1;j++) check(s.substr(j)); | ~^~~~~~~~~~~