Flash cards
Review the key moves
1/3
Core idea
What is the main idea behind DSA Practice: Trace State?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Order
Put the learning moves in the order that makes the concept easiest to apply.
- Read the code or evidence panel before answering.
Open the puzzle, solve it, then come back for the next repetition.
DSA Practice: Trace State
Open the puzzle, solve it, then come back for the next repetition.
| Focus | Details |
|---|---|
| Language | DSA |
| Problem | Contains Duplicate |
| Difficulty | Easy |
| Puzzle mode | trace |
| Goal | Follow the changing variables and identify the state that must be true. |
Bugl practice
Start Contains Duplicate practice
Practice Task
- Read the code or evidence panel before answering.
- Submit the answer in the Bugl puzzle UI.
- Use the explanation to name the exact rule or pattern you missed.
Problem brief: Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.