Class Solution
java.lang.Object
g1201_1300.s1210_minimum_moves_to_reach_target_with_rotations.Solution
1210 - Minimum Moves to Reach Target with Rotations\.
Hard
In an `n*n` grid, there is a snake that spans 2 cells and starts moving from the top left corner at `(0, 0)` and `(0, 1)`. The grid has empty cells represented by zeros and blocked cells represented by ones. The snake wants to reach the lower right corner at `(n-1, n-2)` and `(n-1, n-1)`.
In one move the snake can:
* Move one cell to the right if there are no blocked cells there. This move keeps the horizontal/vertical position of the snake as it is.
* Move down one cell if there are no blocked cells there. This move keeps the horizontal/vertical position of the snake as it is.
* Rotate clockwise if it's in a horizontal position and the two cells under it are both empty. In that case the snake moves from `(r, c)` and `(r, c+1)` to `(r, c)` and `(r+1, c)`.
* Rotate counterclockwise if it's in a vertical position and the two cells to its right are both empty. In that case the snake moves from `(r, c)` and `(r+1, c)` to `(r, c)` and `(r, c+1)`.
Return the minimum number of moves to reach the target.
If there is no way to reach the target, return `-1`.
**Example 1:**
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**Input:**
grid = [ [0,0,0,0,0,1],
[1,1,0,0,1,0],
[0,0,0,0,1,1],
[0,0,1,0,1,0],
[0,1,1,0,0,0],
[0,1,1,0,0,0]]
**Output:** 11
**Explanation:** One possible solution is [right, right, rotate clockwise, right, down, down, down, down, rotate counterclockwise, right, down].
**Example 2:**
**Input:**
grid = [ [0,0,1,1,1,1],
[0,0,0,0,1,1],
[1,1,0,0,0,1],
[1,1,1,0,0,1],
[1,1,1,0,0,1],
[1,1,1,0,0,0]]
**Output:** 9
**Constraints:**
* `2 <= n <= 100`
* `0 <= grid[i][j] <= 1`
* It is guaranteed that the snake starts at empty cells.
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Solution
public Solution()
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minimumMoves
public int minimumMoves(int[][] grid)
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