C#版 - Leetcode 215. Kth Largest Element in an Array-题解

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C#版 - Leetcode 215. Kth Largest Element in an Array-题解

在线提交: https://leetcode.com/problems/kth-largest-element-in-an-array/

Description

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Find the k th largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.

Example 1:

Input: [3,2,1,5,6,4] and k = 2
Output: 5

Example 2:

Input: [3,2,3,1,2,4,5,5,6] and k = 4
Output: 4

Note:

You may assume k is always valid, 1 ≤ k ≤ array’s length.

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• Difficulty: Medium

• Total Accepted: 219.3K

• Total Submissions: 531.5K

• Contributor: mithmatt

  Related Topics Divide and ConquerHeap
  
  Similar Questions Wiggle Sort IITop K Frequent ElementsThird Maximum Number

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思路:

使用List，定义其Sort函数接口，取出第k大的值(List的第k-1个元素)即可。

已AC代码:

public class Solution
{
    public int FindKthLargest(int[] nums, int k)
    {
        int kthMax = 0;
        var list = new List<int>();
        foreach (var num in nums)
            list.Add(num);
        list.Sort((x, y) => -x.CompareTo(y));

        if (list.Count >= k)
            kthMax = list.ElementAtOrDefault(k-1);

        return kthMax;
    }
}

Rank:

You are here!

Your runtime beats 94.55 % of csharp submissions.