Compilare: user.cpp: In function ‘int main()’: user.cpp:13:24: warning: unused variable ‘y’ [-Wunused-variable] int n, i, j, k, x, y, z; ^ user.cpp:13:27: warning: unused variable ‘z’ [-Wunused-variable] int n, i, j, k, x, y, z; ^ user.cpp:10:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("neuroni.in","r",stdin); ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("neuroni.out","w",stdout); ^ user.cpp:15:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^