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Given a **non-empty** array of integers, return the **third** maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n).

**Example 1:**

Input:[3, 2, 1]Output:1Explanation:The third maximum is 1.

**Example 2:**

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

**Example 3:**

Input:[2, 2, 3, 1]Output:1Explanation:Note that the third maximum here means the third maximum distinct number. Both numbers with value 2 are both considered as second maximum.

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