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/*
Challenge 207
Task 2: H-Index
Submitted by: Mohammad S Anwar
You are given an array of integers containing citations a researcher has
received for each paper.
Write a script to compute the researcher’s H-Index. For more information
please checkout the wikipedia page.
The H-Index is the largest number h such that h articles have at least h
citations each. For example, if an author has five publications,
with 9, 7, 6, 2, and 1 citations (ordered from greatest to least),
then the author’s h-index is 3, because the author has three publications
with 3 or more citations. However, the author does not have four
publications with 4 or more citations.
Example 1
Input: @citations = (10,8,5,4,3)
Output: 4
Because the 4th publication has 4 citations and the 5th has only 3.
Example 2
Input: @citations = (25,8,5,3,3)
Output: 3
The H-Index is 3 because the fourth paper has only 3 citations.
*/
#include <algorithm>
#include <iostream>
#include <vector>
int h_index(std::vector<int>& articles) {
std::sort(articles.rbegin(), articles.rend());
for (size_t i = 0; i < articles.size(); i++)
if (articles[i] < i+1)
return i+1-1;
return -1;
}
int main(int argc, char* argv[]) {
argv++; argc--;
std::vector<int> articles;
for (int i = 0; i < argc; i++)
articles.push_back(atoi(argv[i]));
std::cout << h_index(articles) << std::endl;
}
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