Red and Black
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题目
There is a rectangular room, covered with square tiles. Each tile is colored either red or black. A man is standing on a black tile. From a tile, he can move to one of four adjacent tiles. But he can’t move on red tiles, he can move only on black tiles.
Write a program to count the number of black tiles which he can reach by repeating the moves described above.
输入
The input consists of multiple data sets. A data set starts with a line containing two positive integers W and H; W and H are the numbers of tiles i