Arrays & Hashing pattern
Encode and Decode Strings
Design encode(list<string>) → string and decode(string) → list<string> so that the original list is recovered exactly. The strings may contain ANY characters, including whatever you pick as a delimiter. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 271
- Medium
- 2 approaches
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Arrays & HashingLeetCode 271
Medium
From the first idea to the best one
- 01 Naive delimiter (why it breaks) O(N)O(N) space
- 02 Optimized · length prefix O(N)O(N) space
What you will learn
- How to read Encode and Decode Strings and spot the arrays & hashing pattern in it
- Naive delimiter (why it breaks): O(N) time, O(N) space
- Optimized · length prefix: O(N) time, O(N) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Arrays & Hashing
See Encode and Decode Strings run, step by step
Sign in and this page opens on the animation, with all 13 Arrays & Hashing problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.