Introduction - If you have any usage issues, please Google them yourself
Skiing in order to gain speed, the area must slope downward slide. Michael wants to know the end of the longest in a landslide area. Region is given by a two-dimensional array. Each number represents an array of point level. Here is an example
12345
161,718,196
152,425,207
142,322,218
131,211,109
A person can slide up and down from a point adjacent to one of four points, if and only if highly reduced. In the above example, one can slide the slide is 24-17-16-1. Of course 25-24-23-...- 3-2-1 longer. In fact, this is the longest.