Solution: Remove Duplicate Letters
Explore how to solve the problem of removing duplicate letters from a string by using a stack and greedy algorithm. Learn to build the lexicographically smallest string with unique letters while understanding frequency mapping and stack operations for efficient coding interview solutions.
We'll cover the following...
Statement
You are given a string, s, consisting only of lowercase English letters. Your task is to remove duplicate letters so that:
Each letter appears only once in the resulting string.
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 stringbif:
In the first position where they differ, the character in
aappears earlier in the alphabet than inb.If
ais a ...