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Grokking the Coding Interview Patterns in C++

Remove Duplicate Letters

Explore how to remove duplicate letters from a string while ensuring each letter appears once and the result is lexicographically smallest. This lesson helps you understand stack applications and implement an efficient C++ solution for this common coding interview problem.

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Statement

You are given a string, s, consisting only of lowercase English letters. Your task is to remove duplicate letters so that:

  1. Each letter appears only once in the resulting string.

  2. The resulting string is the smallest in lexicographical order among all possible results that satisfy the above condition.

Return the final string.

A string, a, is considered lexicographically smaller than string b if:

    ...