Once a day, XX has been caught by evil Z. WisKey, our team leader, has to rescue her. They have escaped from Z’s castle. But unfortunately, they lost in the forest. What’s more, this forest is a big maze. There is only one place to leave. Z is familiar with the forest, and he will arrive at the place in T minutes.
To make the problem simply, we assume the forest is a N*M two-dimensional array which left-top corner is (0,0) and right-bottom corner is (N-1,M-1). The place they stayed now is marked S , and the place to leave is marked E. They could only move to empty place in four directions (up, down , left, right ), or stay at the place.
> . : empty
> X: the tree
> S: the place Wiskey and XX now stay
> E: the place to leave
Your task is to give out whether they can escape.