Compilare: user.cpp: In function ‘int calcul(int)’: user.cpp:41:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:41:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:145:26: warning: ‘NR’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << q << " " << NR; ^ user.cpp:98:18: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(i <= N && j <= N) ^