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Longest Substring Without Repeating Characters

intermediatelayer B5 · Sliding window5 tests

Write lengthOfLongestSubstring(s) returning the length of the longest contiguous stretch of s in which no character appears twice.

  • Return a number, not the substring itself
  • The empty string answers 0
  • Spaces, digits and symbols are ordinary characters here
  • One pass over the string is enough

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