How should I practice Changing Username?

Start by reading the full statement, solve the visible examples, then compare the pattern against related TikTok online assessment problems in FastPrep.

Is Changing Username associated with TikTok?

FastPrep tags this as a TikTok online assessment coding practice problem when the problem catalog has that company and stage context.

Changing Username

TikTok● MediumOA

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Problem statement

A TikTok user has a username represented by a string of lowercase English letters, username. The user wants to transform their username to explore possible variations. The user can perform the following operations on the username multiple times, in any order:

Replace an occurrence of 'cc' with 'a'.
Replace an occurrence of 'dd' with 'b'.

The user may also choose not to apply any operations, leaving the username unchanged.

Given the string username, determine the total number of distinct usernames that can be generated by applying these transformations. Since the result can be large, return the total count modulo 10⁹+7.

Function

distinctUsernames(username: String) → int

Examples

Example 1

username = "ccc"return = 3

The possible usernames that can be generated are:

"ccc" → "ac"
"ccc" → "ca"
"ccc" (No operation is applied)

Hence the answer is 3.

Problem statement

Function

Examples

Example 1

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