Compilare: main.cpp: In function 'int main()': main.cpp:59:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:57:8: warning: unused variable 'n' [-Wunused-variable] 57 | int n,i,j,k,l; | ^ main.cpp:57:12: warning: unused variable 'j' [-Wunused-variable] 57 | int n,i,j,k,l; | ^ main.cpp:57:14: warning: unused variable 'k' [-Wunused-variable] 57 | int n,i,j,k,l; | ^ main.cpp:57:16: warning: unused variable 'l' [-Wunused-variable] 57 | int n,i,j,k,l; | ^