题目
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."
For example, given citations = [3, 0, 6, 1, 5], which 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, his h-index is 3.
Note: If there are several possible values for h, the maximum one is taken as the h-index.
答案
用了sort的方法，复习的时候看下其他解法。。
class Solution {
public int hIndex(int[] citations) {
int ans = 0, count = 0;
Arrays.sort(citations);
for(int i = citations.length - 1; i >= 0; i--) {
if(citations[i] >= count + 1)
ans = count + 1;
count++;
}
return ans;
}
}
