LeetCode : Third Maximum Number
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: 1
Explanation: The third maximum is 1.
Example 2:
Input: [1, 2]
Output: 2
Explanation: The third maximum does not exist, so the maximum (2) is returned instead.
Example 3:
Input: [2, 2, 3, 1]
Output: 1
Explanation: Note that the third maximum here means the third maximum distinct number.
Both numbers with value 2 are both considered as second maximum.
class Solution {
public:
int thirdMax(vector<int>& nums) {
set<int> s;
for (int num : nums) {
s.insert(num);
if (s.size() > 3) {
s.erase(s.begin());
}
}
return s.size() == 3 ? *s.begin() : *s.rbegin();
}
};
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