Third Maximum Number LeetCode Solution

Problem – Third Maximum Number LeetCode Solution

Given an integer array nums, return the third distinct maximum number in this array. If the third maximum does not exist, return the maximum number.

Example 1:

Input: nums = [3,2,1]
Output: 1
Explanation:
The first distinct maximum is 3.
The second distinct maximum is 2.
The third distinct maximum is 1.

Example 2:

Input: nums = [1,2]
Output: 2
Explanation:
The first distinct maximum is 2.
The second distinct maximum is 1.
The third distinct maximum does not exist, so the maximum (2) is returned instead.

Example 3:

Input: nums = [2,2,3,1]
Output: 1
Explanation:
The first distinct maximum is 3.
The second distinct maximum is 2 (both 2's are counted together since they have the same value).
The third distinct maximum is 1.

Constraints:

• 1 <= nums.length <= 104
• -231 <= nums[i] <= 231 - 1

Third Maximum Number LeetCode Solution in Java

    public int thirdMax(int[] nums) {
        Integer max1 = null;
        Integer max2 = null;
        Integer max3 = null;
        for (Integer n : nums) {
            if (n.equals(max1) || n.equals(max2) || n.equals(max3)) continue;
            if (max1 == null || n > max1) {
                max3 = max2;
                max2 = max1;
                max1 = n;
            } else if (max2 == null || n > max2) {
                max3 = max2;
                max2 = n;
            } else if (max3 == null || n > max3) {
                max3 = n;
            }
        }
        return max3 == null ? max1 : max3;
    }

Third Maximum Number LeetCode Solution in Python

class Solution(object):
    def thirdMax(self, nums):
        v = [float('-inf'), float('-inf'), float('-inf')]
        for num in nums:
            if num not in v:
                if num > v[0]:   v = [num, v[0], v[1]]
                elif num > v[1]: v = [v[0], num, v[1]]
                elif num > v[2]: v = [v[0], v[1], num]
        return max(nums) if float('-inf') in v else v[2]

Third Maximum Number LeetCode Solution in C++

int thirdMax(vector<int>& nums) {
    set<int> top3;
    for (int num : nums) {
        top3.insert(num);
        if (top3.size() > 3)
            top3.erase(top3.begin());
    }
    return top3.size() == 3 ? *top3.begin() : *top3.rbegin();
}

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