Time Limit: 1000 mSec
Memory Limit: 32768 KB
The doggie found a bone in an ancient maze, which fascinated him a lot. However,
when he picked it up, the maze began to shake, and the doggie could feel the
ground sinking. He realized that the bone was a trap, and he tried desperately
to get out of this maze.
The maze was a rectangle with sizes N by M. There was a door in the maze. At the beginning, the door was closed and it would open at the T-th second for a short period of time (less than 1 second). Therefore the doggie had to arrive at the door on exactly the T-th second. In every second, he could move one block to one of the upper, lower, left and right neighboring blocks. Once he entered a block, the ground of this block would start to sink and disappear in the next second. He could not stay at one block for more than one second, nor could he move into a visited block. Can the poor doggie survive? Please help him.