leetcode1375

class Solution:
    def numTimesAllBlue(self, light: 'List[int]') -> int:
        right,res = 0,0
        for i, a in enumerate(light, start=1):
            right = max(right, a)
            if right == i:
                res += 1
        return res

算法思路：数组。

参考：https://leetcode.com/problems/bulb-switcher-iii/discuss/532538/JavaC%2B%2BPython-Straight-Forward-O(1)-Space