Determine if a string has all Unique Characters in 4 ways

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00:00 problem description
00:24 Brute Force technique
02:10 code walkthrough
02:44 complexity analysis
03:34 Sorting: Using sorting code walkthrough
04:10 complexity analysis
05:13 Extra Data Structure based on ASCII values of characters code walkthrough
05:52 complexity analysis
06:34 Counter in python code walkthrough
07:33 complexity analysis
  1. Chier Hu
  2. Data structure
  3. algorithm
  4. python
  5. Array
  6. Computer science
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