Leetcode 1306. Jump Game III

2021-08-13 11:41:21 浏览数 (1)

1. Description

2. Solution

**解析:**Version 1,使用广度优先搜索,其实是个二叉树遍历问题,使用字典记录搜索过的索引,每次根据当前值计算下一次搜索的左右索引,如果在数组范围内且没被搜索过,则将其记录到队列中,依次搜索,如果当前值为0,返回True,如果队列为空时都没找到,则返回False

  • Version 1
代码语言:javascript复制
class Solution:
    def canReach(self, arr: List[int], start: int) -> bool:
        n = len(arr)
        queue = collections.deque()
        queue.append(start)
        records = {}
        while queue:
            index = queue.popleft()
            value = arr[index]
            if value == 0:
                return True
            records[index] = value
            left = index - value
            right = index   value
            if left > -1 and left not in records:
                queue.append(left)
            if right < n and right not in records:
                queue.append(right)
        return False

Reference

  1. https://leetcode.com/problems/jump-game-iii/

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