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Remove Duplicate Characters

Problem

Given a string Str which may contain lowercase and uppercase characters. The task is to remove all duplicate characters from the string and find the resultant string. The order of remaining characters in the output should be the same as in the original string.

Example 1:

Input:["HappyNewYear"]

Output:"HapyNewYr"

Example 2:

Input:["HappyBirthday"]

Output:"HapyBirthd"

Constraints:

1 ≤ N ≤ 105

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Remove Duplicate Characters

MediumMed•510 views

Problem

Given a string Str which may contain lowercase and uppercase characters. The task is to remove all duplicate characters from the string and find the resultant string. The order of remaining characters in the output should be the same as in the original string.