Compilare: user.c:4:1: warning: excess elements in array initializer [enabled by default] int dx[4]={0,-1,0,+1,0}; ^ user.c:4:1: warning: (near initialization for ‘dx’) [enabled by default] user.c:5:1: warning: excess elements in array initializer [enabled by default] int dy[4]={0,0,+1,0,-1}; ^ user.c:5:1: warning: (near initialization for ‘dy’) [enabled by default] user.c: In function ‘main’: user.c:24:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ user.c:25:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ user.c:26:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.c:29:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^