Compilare: main.cpp: In function 'int main()': main.cpp:14:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int j=i; j<s.size(); j++) | ~^~~~~~~~~ main.cpp:10:9: warning: unused variable 'a' [-Wunused-variable] 10 | int a,ok=0,p=0,n=0,u=0,oj=-1; | ^ main.cpp:10:16: warning: unused variable 'p' [-Wunused-variable] 10 | int a,ok=0,p=0,n=0,u=0,oj=-1; | ^