Compilare: main.cpp: In function 'int fn(int)': main.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:57:30: warning: 'gr' may be used uninitialized in this function [-Wmaybe-uninitialized] g << ans << ' ' << gr << '\n'; ^~~~