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class Solution {
public:
    int thirdMax(vector<int>& nums) {
        long first = LONG_MIN, sec = LONG_MIN, third = LONG_MIN;
        for(int i = 0; i < nums.size(); i++) {
            if (nums[i] > first) {
                third =  sec;
                sec = first;
                first = nums[i];
            } else if (nums[i] > sec && nums[i] < first) {
                third = sec;
                sec = nums[i];
            } else if (nums[i] > third && nums[i] < sec){
                third = nums[i];
            }
        }
        return (third == LONG_MIN || third == sec) ? first : third;
    }
};