Compilare: main.cpp: In function 'int main()': main.cpp:13:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i = 0; i<str.size(); i++) { | ~^~~~~~~~~~~ main.cpp:15:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int j = i; j<str.size(); j++) { | ~^~~~~~~~~~~