(Easy) Third Maximum Number LeetCode
Description:
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.
Solution:
class Solution { public int thirdMax(int[] nums) { if(nums==null||nums.length<=0){ return 0; } Arrays.sort(nums); int max_real = nums[nums.length-1]; int max = nums[nums.length-1]; int k = 3; int third=0; for( int i =nums.length-1; i>=0 && k>=1; i--){ System.out.println(i); if(nums[i]<max){ max = nums[i]; k=k-1; } if(k ==1){ third = nums[i]; return third; } } return max_real; } }