Compilare: main.cpp: In function 'int main()': main.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i=0; i<s.size()-1; i++) | ~^~~~~~~~~~~ main.cpp:30:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:39:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(int i=last+1; i<s.size()-1; i++){ | ~^~~~~~~~~~~