Compilare: user.c:11:1: warning: missing braces around initializer [-Wmissing-braces] int t[10000][10000]={-1}; ^ user.c:11:1: warning: (near initialization for ‘t[0]’) [-Wmissing-braces] user.c: In function ‘main’: user.c:25:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle2.in","r",stdin); ^ user.c:26:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle2.out","w",stdout); ^ user.c:28:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&mm); ^ user.c:30:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^