题目:原题链接(中等)

标签:广度优先搜索、动态规划、记忆化递归

解法 时间复杂度 空间复杂度 执行用时
Ans 1 (Python) O ( 6000 ) O(6000) O(6000) O ( 6000 ) O(6000) O(6000) 92ms (60.89%)
Ans 2 (Python)
Ans 3 (Python)

解法一:

class Solution:
    _BIG = 6001

    def minimumJumps(self, forbidden: List[int], a: int, b: int, x: int) -> int:
        visited0 = set(forbidden)
        visited1 = set(forbidden)
        queue = collections.deque([(0, 0)])
        step = 0
        while queue:
            for _ in range(len(queue)):
                i, j = queue.popleft()
                if i == x:
                    return step
                if i + a < self._BIG and i + a not in visited0:
                    queue.append((i + a, 0))
                    visited0.add(i + a)
                if j == 0 and i - b >= 0 and i - b not in visited1:
                    queue.append((i - b, 1))
                    visited1.add(i - b)
            step += 1
        return -1