打卡题目：leetcode第55题，跳跃游戏
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    【代码】

    1. class Solution:
    2.     def canJump(self, nums: List[int]) -> bool:
    3.         reach = 0
    4.         for i in range(len(nums)):
    5.             if i > reach: return False
    6.             reach = max(reach, i + nums[i])
    7.         return True