Compilare: main.cpp: In function 'int main()': main.cpp:23:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int j=0;j<x.size();j++) | ~^~~~~~~~~ main.cpp:56:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int j=0;j<x.size();j++) | ~^~~~~~~~~ main.cpp:95:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for(int j=0;j<x.size();j++) | ~^~~~~~~~~