K-th largest element in an array

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

For example,
Given [3,2,1,5,6,4] and k = 2, return 5.

Note: 
You may assume k is always valid, 1 ≤ k ≤ array‘s length.

Credits:
Special thanks to @mithmatt for adding this problem and creating all test cases.

Runtime: 12ms

 1 class Solution {
 2 public:
 3     int findKthLargest(vector<int>& nums, int k) {
 4         int n = nums.size();
 5         if(n == 0 || k > n) return 0;
 6         
 7         sort(nums.begin(), nums.end());
 8         return nums[n - k];
 9     }
10 };

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K-th largest element in an array

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原文地址：http://www.cnblogs.com/amazingzoe/p/4850618.html