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Interview question 17.10 Main elements

2022-04-23 16:03:00 【Zhang Joshua】

Interview questions 17.10. Main elements

Question no ： Press the interview questions 17.10
Knowledge point ： Array , Count
Goal completion ：24/150
summary
stem ：

Ideas ：

1. The difficulty of this problem is that the time complexity is O(N), The space complexity is O(1) The requirements of . Using Moore voting
2. Moore voting ：

class Solution:
    def majorityElement(self, nums: List[int]) -> int:
        count = 0
        ans = 0
        for num in nums:
            if count==0:
                ans = num
            if ans == num:
                count += 1
            if ans != num:
                count -= 1
        if nums.count(ans) > len(nums)//2:
            return ans
        else:
            return -1

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