- Time limit: 1.00 s
- Memory limit: 512 MB
A Klotski puzzle consists of a board of size 5 \times 4 and 10 blocks:
- 4 blocks of size 2 \times 1 (A, B, C, D)
- 1 block of size 1 \times 2 (E)
- 4 blocks of size 1 \times 1 (F, G, H, I)
- 1 block of size 2 \times 2 (X)
For example, here is one Klotski puzzle:
Your goal is to move the 2 \times 2 block to the position from which it can escape the board. What is the minimum number of moves needed for this?
The input consists of five lines, each of which contains four characters. Each character is a letter (there is a block) or a dot (empty cell).
Print one integer: the minimum number of moves needed to solve the puzzle. If the puzzle is unsolvable, output -1.
AXXC AXXC BEED BGHD F..I