Eroare de compilare: user.cpp: In function ‘int solve(int)’: user.cpp:15:16: error: ‘sol’ was not declared in this scope ++ sol ; ^ user.cpp:20:12: error: ‘sol’ was not declared in this scope return sol ; ^ user.cpp: In function ‘int main()’: user.cpp:26:5: error: ‘cin’ was not declared in this scope cin >> n ; ^ user.cpp:27:5: error: ‘cout’ was not declared in this scope cout << solve ( n ) ; ^ user.cpp: In function ‘int solve(int)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^