6. Dutch National Flag

Medium

Topics

Helpful tools to learn & understand

Visualize LogicActive Simulator

Watch key transitions, pointers, and variables update step-by-step.

Open

Check Solutions

Read clean, documented implementations across multiple patterns.

View Code

Thinkpad (Draw & Note)

Sketch diagrams on an infinite canvas and draft notes directly inline.

Draw

Example 1:

Input: nums = [0, 1, 0, 2, 1, 2]

Output: [0, 0, 1, 1, 2, 2]

Explanation: The array is rearranged such that all 0s come first, followed by 1s, and then 2s.

Example 2:

Input: nums = [2, 0, 1]

Output: [0, 1, 2]

Explanation: The array is sorted in ascending order with 0s, 1s, and 2s.

Example 3:

Input: nums = [0, 0, 0]

Output: [0, 0, 0]

Explanation: The array is already sorted with all 0s.

Example 4:

Input: nums = [2, 2, 2]

Output: [2, 2, 2]

Explanation: The array is already sorted with all 2s.

Example 5:

Input: nums = [1, 1, 1]

Output: [1, 1, 1]

Explanation: The array is already sorted with all 1s.

Constraints:

•
•

Time Complexity

O(n)

Space Complexity

O(1)