LEETCODEMedium

H-Index

풀이일 2025 · 03 · 26기록 1 ms · 54.5 MB원문 leetcode ↗

ArraySortingCounting Sort

문제

Given an array of integers citations where citations[i] is the number of citations a researcher received for their i^th paper, return the researcher's h-index.

According to the definition of h-index on Wikipedia: The h-index is defined as the maximum value of h such that the given researcher has published at least h papers that have each been cited at least h times.

Example 1:

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, their h-index is 3.

Example 2:

Input: citations = [1,3,1]
Output: 1

Constraints:

n == citations.length
1 <= n <= 5000
0 <= citations[i] <= 1000

풀이 TypeScript

function hIndex(citations: number[]): number {
  const sorted = citations.sort((a, b) => b - a)
  for(let i = 0; i < sorted.length; i++) {
    if(sorted[i] < i + 1) return i
  }
  return sorted.length
}

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