LC 274. H-Index

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.

Runtime: 4 ms, faster than 72.66% of C++ online submissions for H-Index.

STL的应用。

#define ALL(x) (x).begin(),(x).end()

#include <vector>

#include <algorithm>

using namespace std;

class Solution {

public:

  int hIndex(vector<int>& citations) {

    sort(ALL(citations));

    reverse(ALL(citations));

    int idx = citations.size()+;

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

      if(citations[i] < i+) {

        idx = i+;

        break;

      }

    }

    return idx-;

  }

};

巴特西

LC 274. H-Index

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