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Grokking the Coding Interview Patterns in Go

Solution: Longest Happy String

Explore how to construct the longest happy string from characters a, b, and c by using heaps to prioritize characters and avoid repetition. Understand the step-by-step process, constraints, and efficient heap operations to generate a valid result string while mastering the longest happy string pattern in Go.

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Statement

A string is considered happy if it meets the following conditions:

  1. It comprises only the characters 'a', 'b', and 'c'.

  2. It does not contain the substrings "aaa", "bbb", or "ccc".

  3. The total occurrences of:

    1. The character 'a' does not exceed a.

    2. The character 'b' does not exceed b.

    3. The character 'c' does not exceed c.

You are given three integers, a, b, and c, representing the maximum allowable occurrences of 'a', 'b', and 'c', respectively. Your task is to return the longest possible happy string. If there are multiple valid longest happy strings, return any one of them. If no such string can be formed, return an empty string "".

Note: A substring is a contiguous sequence of characters within a string.

Constraints:

  • 0≤0 \leq a, b, c ≤100\leq 100

  • a+b+c>0a + b + c > 0 ...