Compilare: user.cpp: In function ‘int main()’: user.cpp:15:9: warning: unused variable ‘n’ [-Wunused-variable] int n, m, i, j, x, y, z; ^ user.cpp:15:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, i, j, x, y, z; ^ user.cpp:15:15: warning: unused variable ‘i’ [-Wunused-variable] int n, m, i, j, x, y, z; ^ user.cpp:15:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, z; ^ user.cpp:18:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^