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# Majority Element II

Given an integer array of size n, find all elements that appear more than `⌊ n/3 ⌋` times.

**Note:** The algorithm should run in linear time and in O(1) space.

**Example 1:**

```
Input: [3,2,3]
Output: [3]
```

**Example 2:**

```
Input: [1,1,1,3,3,2,2,2]
Output: [1,2]
```

分析

求出现频率超过1/3的数字

可以每次出现3组数的时候就减掉Triple,这样抵消到最后。剩余的数字算算有没全局的1/3

这里注意dict相减法，和直接set（dict）得到所有unique key

```
collections.Counter(set(cnt))
```

```
class Solution:
    def majorityElement(self, nums: List[int]) -> List[int]:
        cnt = collections.Counter()
        for i in nums:
            cnt[i] += 1
            if len(cnt) == 3:
                cnt -= collections.Counter(set(cnt))
        return [n for n in cnt if nums.count(n) > int(len(nums) / 3)]
        
```


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