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275. H-Index II

  • Time: $O(\log n)$
  • Space: $O(1)$
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class Solution {
 public:
  int hIndex(vector<int>& citations) {
    const int n = citations.size();
    int l = 0;
    int r = n;

    while (l < r) {
      const int m = (l + r) / 2;
      if (citations[m] >= n - m)
        r = m;
      else
        l = m + 1;
    }

    return n - l;
  }
};

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class Solution {
  public int hIndex(int[] citations) {
    final int n = citations.length;
    int l = 0;
    int r = n;

    while (l < r) {
      final int m = (l + r) / 2;
      if (citations[m] >= n - m)
        r = m;
      else
        l = m + 1;
    }

    return n - l;
  }
}

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class Solution:
  def hIndex(self, citations: list[int]) -> int:
    n = len(citations)
    return n - bisect.bisect_left(range(n), n,
                                  key=lambda m: citations[m] + m)