Compilare: main.cpp: In function 'int main()': main.cpp:38:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(i=0;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:36:16: warning: unused variable 'put' [-Wunused-variable] 36 | int i,ap=0,put,nr=0,n=0,j; | ^~~