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Grokking the Coding Interview Patterns in C++

Sort Colors

Explore how to apply the two pointers technique to sort an array containing three colors represented by 0, 1, and 2. This lesson teaches you to solve the problem in place, efficiently arranging the colors without additional space or built-in sorting methods.

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Statement

Given an array, colors, which contains a combination of the following three elements:

  • 0 (Representing red)

  • 1 (Representing white)

  • 2 (Representing blue)

Sort the array in place so that the elements of the same color are adjacent, and the final order is: red (0), then white (1), and then blue (2).

Note: You are not allowed to use any built-in sorting functions. The goal is to solve this efficiently without extra space.

Constraints:

  • ...