Compilare: user.cpp: In function ‘int main()’: user.cpp:38:6: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp:39:6: warning: unused variable ‘j’ [-Wunused-variable] int j = 0; ^ user.cpp:52:21: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized] int p = mij - sum - val; ~~~~~~~~~~^~~~~ user.cpp:33:13: warning: ‘sum’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << sum / 2 << "\n"; ^