Compilare: main.cpp: In function 'int main()': main.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::stack<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | if(l==mystack.size()) | ~^~~~~~~~~~~~~~~~ main.cpp:13:39: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 13 | int n,i,secventa=0,secventa_max=0,ok=0,l=0; | ^~