Compilare: main.cpp: In function 'int main()': main.cpp:39:19: 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=1;i<s.size ();++i){ | ~^~~~~~~~~~ main.cpp:10:24: warning: unused variable 'k' [-Wunused-variable] 10 | int n,poz,x,nr,val,k,y,z; | ^ main.cpp:10:26: warning: unused variable 'y' [-Wunused-variable] 10 | int n,poz,x,nr,val,k,y,z; | ^