[leetcode] 229. Majority Element II
Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times. The algorithm should run in linear time and in O(1) space.
Hint:
- How many majority elements could it possibly have?
- Do you have a better hint? Suggest it!
class Solution {
public:vector<int> majorityElement(vector<int>& nums) {vector<int> res;int m=0, n=0, cm=0, cn=0;for(auto &a:nums){if(a==m) ++cm;else if(a==n) ++cn;else if(cm==0) m=a, cm=1;else if(cn==0) n=a, cn=1;else --cm, --cn;}cm=0; cn=0;for(auto &a:nums){if(a==m) cm++;else if(a==n) cn++;}if(cm>nums.size()/3) res.push_back(m);if(cn>nums.size()/3) res.push_back(n);return res;}
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