Problem: Sort Colors

med

30 min

Explore how to efficiently sort an array containing red, white, and blue objects represented by 0, 1, and 2. This lesson helps you implement a one-pass, constant space algorithm using the two pointers technique to group colors in the required order.

Statement

You are given an array nums of length n, where each element represents an object colored either red, white, or blue. The integers 0, 1, and 2 are used to represent red, white, and blue, respectively.

Sort the array in place so that all objects of the same color are grouped together, arranged in the order: red (0), white (1), and blue (2).

You must solve this problem without using any library sort function.

Note: Could you come up with a one pass algorithm using only constant extra space?

Constraints:

$n$ $==$ colors.length
$1 \leq$ $n$ $\leq 300$
colors[i] is either 0, 1, or 2

Problem: Sort Colors

med

30 min

Statement

Sort the array in place so that all objects of the same color are grouped together, arranged in the order: red (0), white (1), and blue (2).

You must solve this problem without using any library sort function.

Note: Could you come up with a one pass algorithm using only constant extra space?

Constraints:

$n$ $==$ colors.length
$1 \leq$ $n$ $\leq 300$
colors[i] is either 0, 1, or 2

Problem: Sort Colors

Statement

Examples

Understand the problem

Figure it out!

Try it yourself

Problem: Sort Colors

Statement

Examples

Understand the problem

Figure it out!

Try it yourself