C语言小白拼尽全力无法战胜（#5WA），求各位大佬指教）

# include <stdio.h>
int main ()
{
	int len, i, j, m = 1, x = 1;
	scanf ("%d", &len);
	int a[len];
		for (i = 0; i < len; i++)
		{
			scanf ("%d", &a[i]);	
		}	
		for (j = 0; j < len - 1; j++)
			{
			if (a[j] + 1 == a[j+1])
				m++;
			else
				{
					x = m;
					m = 1;
				}	
			}	
		if (x > m)		
			printf ("%d", x);
		else 
			printf ("%d", m);	
	return 0;
}