Package g0601_0700.s0675_cut_off_trees_for_golf_event

Class Solution

java.lang.Object

g0601_0700.s0675_cut_off_trees_for_golf_event.Solution

public class Solution
extends Object

675 - Cut Off Trees for Golf Event\. Hard You are asked to cut off all the trees in a forest for a golf event. The forest is represented as an `m x n` matrix. In this matrix: * `0` means the cell cannot be walked through. * `1` represents an empty cell that can be walked through. * A number greater than `1` represents a tree in a cell that can be walked through, and this number is the tree's height. In one step, you can walk in any of the four directions: north, east, south, and west. If you are standing in a cell with a tree, you can choose whether to cut it off. You must cut off the trees in order from shortest to tallest. When you cut off a tree, the value at its cell becomes `1` (an empty cell). Starting from the point `(0, 0)`, return _the minimum steps you need to walk to cut off all the trees_. If you cannot cut off all the trees, return `-1`. You are guaranteed that no two trees have the same height, and there is at least one tree needs to be cut off. **Example 1:**  **Input:** forest = \[\[1,2,3],[0,0,4],[7,6,5]] **Output:** 6 **Explanation:** Following the path above allows you to cut off the trees from shortest to tallest in 6 steps. **Example 2:**  **Input:** forest = \[\[1,2,3],[0,0,0],[7,6,5]] **Output:** -1 **Explanation:** The trees in the bottom row cannot be accessed as the middle row is blocked. **Example 3:** **Input:** forest = \[\[2,3,4],[0,0,5],[8,7,6]] **Output:** 6 **Explanation:** You can follow the same path as Example 1 to cut off all the trees. Note that you can cut off the first tree at (0, 0) before making any steps. **Constraints:** * `m == forest.length` * `n == forest[i].length` * `1 <= m, n <= 50` * 0 <= forest[i][j] <= 109

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	cutOffTree(List<List<Integer>> forest)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

cutOffTree

public int cutOffTree(List<List<Integer>> forest)