Grokking 75: Top Coding Interview Questions
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Solution: H-Index
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Problem Statement

Given an integer array citations where citations[i] represents the number of times a researcher's i<sup>th</sup> paper has been cited, return the researcher's h-index.

The h-index is defined as the maximum number h such that the researcher has h papers with at least h citations each.

Examples

Example 1

  • Input: citations = [4, 3, 0, 1, 5]
  • Expected Output: 3
  • Justification: The researcher has 3 papers with at least 3 citations each.

Example 2

  • Input: citations = [10, 8, 5, 4, 3, 7, 2, 1]
  • Expected Output: 4

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