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On a 2x3 `board`

, there are 5 tiles represented by the integers 1 through 5, and
an empty square represented by 0.

A move consists of choosing `0`

and a 4-directionally adjacent number and
swapping it.

The state of the board is *solved* if and only if the `board`

is `[[1,2,3],[4,5,0]].`

Given a puzzle board, return the least number of moves required so that the state of the board is solved. If it is impossible for the state of the board to be solved, return -1.

**Examples:**

Input:board = [[1,2,3],[4,0,5]]Output:1Explanation:Swap the 0 and the 5 in one move.

Input:board = [[1,2,3],[5,4,0]]Output:-1Explanation:No number of moves will make the board solved.

Input:board = [[4,1,2],[5,0,3]]Output:5Explanation:5 is the smallest number of moves that solves the board. An example path: After move 0: [[4,1,2],[5,0,3]] After move 1: [[4,1,2],[0,5,3]] After move 2: [[0,1,2],[4,5,3]] After move 3: [[1,0,2],[4,5,3]] After move 4: [[1,2,0],[4,5,3]] After move 5: [[1,2,3],[4,5,0]]

Input:board = [[3,2,4],[1,5,0]]Output:14

**Note:**

`board`

will be a 2 x 3 array as described above.`board[i][j]`

will be a permutation of`[0, 1, 2, 3, 4, 5]`

.

All contents and pictures on this website come from the Internet and are updated regularly every week. They are for personal study and research only, and should not be used for commercial purposes. Thank you for your cooperation.