Leetcode274.H-IndexH指数

原题的中文翻译不是很好，所以给出英文版。

Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index.

According to the definition of h-index on Wikipedia: "A scientist has index h if h of his/her N papers have at least h citations each, and the other N − h papers have no more than h citations each."

Example:

Input: citations = [3,0,6,1,5] Output: 3 Explanation: [3,0,6,1,5] means the researcher has 5 papers in total and each of them had received 3, 0, 6, 1, 5 citations respectively. Since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, her h-index is 3.

Note: If there are several possible values for h, the maximum one is taken as the h-index.

我的理解：

h指数就是在总N篇文章中有h篇文章中引用次数至少为h。

剩下的N-h篇文章的引用次数不超过h。

找最大的h，最大的h为N，所以从h = N开始遍历验证。

  class Solution {

  public:

	  int hIndex(vector<int>& citations)

	  {

		  sort(citations.begin(), citations.end());

		  int ans = citations.size();

		  for (int i = 0; i < citations.size(); i++)

		  {

			  if (ans <= citations[i])

			  {

				  break;

			  }

              //文章数-1, h指数-1

			  else

			  {

				  ans--;

			  }

		  }

		  return ans;

	  }

  };

巴特西

Leetcode274.H-IndexH指数

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