Compilare: main.cpp: In function 'int main()': main.cpp:13:44: warning: operation on 'n' may be undefined [-Wsequence-point] else if(t == 2) g << n << " " << n -- << "\n"; ~~^~ main.cpp:14:38: warning: operation on 'st' may be undefined [-Wsequence-point] else g << st ++ << " " << st ++ << " " << st ++ << "\n"; ~~~^~