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class Solution {
    public List<Integer> majorityElement(int[] nums) {
        List<Integer> res = new ArrayList<>();
        if(nums == null || nums.length == 0)    return res;
        
        int candidate1 = nums[0], candidate2 = nums[0], count1 = 0, count2 = 0;
        
        for(int num : nums) {
            if(num == candidate1) {
                count1++;
            } else if(num == candidate2) {
                count2++;
            } else if(count1 == 0) {
                candidate1 = num;
                count1 = 1;
            } else if(count2 == 0) {
                candidate2 = num;
                count2 = 1;
            } else {
                count1--;
                count2--;
            }
        }
        
        count1 = 0;
        count2 = 0;
        
        for(int num : nums) {
            if(num == candidate1) {
                count1++;
            } else if(num == candidate2) {
                //已经保证 candidate1 != candidate2
                count2++;
            }
        }
        
        if(count1 > nums.length / 3)
            res.add(candidate1);        
        if(count2 > nums.length / 3)
            res.add(candidate2); 
        
        return res;
        
    }
}