Arrays & Hashing pattern
Contains Duplicate
Given an integer array, return true if any value appears at least twice, and false if every element is distinct. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 217
- Easy
- 2 approaches
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Arrays & HashingLeetCode 217
Easy
From the first idea to the best one
- 01 Brute force O(n²)O(1) space
- 02 Optimized · set O(n)O(n) space
What you will learn
- How to read Contains Duplicate and spot the arrays & hashing pattern in it
- Brute force: O(n²) time, O(1) space
- Optimized · set: 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 Contains Duplicate 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.