Grokking the Coding Interview: Patterns for Coding Questions
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 Sujay
Why O(1)?

Sujay

Jan 26, 2025

  1. We need to iterate through the entire string at least once to count the occurrences of each character. This step alone requires O(n) time, where n is the length of the string.
  2. In the worst case, we might have a string with n-1 repeating characters and a unique character at the end. This means we would need to scan through almost the entire string again to find that unique character

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