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Arrays and Strings

Master array and string problems in Python: two pointers, sliding window, prefix sums and Unicode-safe text handling

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0 / 20 tricks - Trick Book
  1. 1

    Arrays and Strings: List Mechanics, In-Place Updates, Two Pointers

    5-stop ride5 min read

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  2. 2

    Sliding Window Technique in Python: Fixed and Variable Windows

    5-stop ride5 min read

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  3. 3

    Prefix Sums and Difference Arrays in Python: Range Queries and Updates

    5-stop ride5 min read

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  4. 4

    Python String Problems: Anagrams, Palindromes, Parsing and Unicode

    5-stop ride6 min read

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Each ride has 5 stops: read the trick, answer the question, ride on. Pass with 3 of 5 correct (1 star), 4 for 2 stars, all 5 for 3 stars. Progress is saved in this browser. Prefer to read first? Open the reading version of Arrays and Strings.