LeetCode OJ 274. H-Index
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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.
就是一个快排,不过题意有点含糊,至少h citations并不一定意味着一定要有等于h citations的,并且剩下的N - h是no more than,也就是可以存在等于的情况。
void Swap(int A[], int a, int b){ int tmp = A[a]; A[a] = A[b]; A[b] = tmp; } int Partition(int* citations, int left, int right){ int pivot = citations[right]; int i, j = 0; for(i = 0; i < right; i++){ if(citations[i] >= pivot){ Swap(citations, i, j); j++; } } Swap(citations, j, right); return j; } void Quick_Sort(int* citations, int left, int right){ int pivot_position; if(left >= right){ return; } pivot_position = Partition(citations, left, right); Quick_Sort(citations, left, pivot_position - 1); Quick_Sort(citations, pivot_position + 1, right); } int hIndex(int* citations, int citationsSize) { int i; Quick_Sort(citations, 0, citationsSize - 1); for(i = citationsSize - 1; i >= 0 ; i--){ if(citations[i] >= i + 1){ return i + 1; } } return 0; }
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