How should I practice Comment Word and Substring Search?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Rippling phone screen problems in FastPrep.

Is Comment Word and Substring Search associated with Rippling?

FastPrep tags this as a Rippling phone screen coding practice problem when the problem catalog has that company and stage context.

Comment Word and Substring Search

Rippling● MediumINTERNPHONE SCREEN

Learn

Problem statement

You are given parallel arrays commentIds and comments. Each comment has a unique integer ID and a text string. Return the IDs of comments matching the search word.

In WORD mode, the query must equal a complete space-delimited word.
In SUBSTRING mode, the query may occur inside a longer word.

Text and queries use lowercase English letters; text may also contain spaces. A word is a maximal nonempty run of letters. Return each matching ID once, in the same order as the input comments. The collection is fixed for this call.

Function

searchComments(commentIds: int[], comments: String[], word: String, mode: String) → int[]

Examples

Example 1

commentIds = [41,7,20]comments = ["red bird","bluebird red","blue bird"]word = "bird"mode = "WORD"return = [41,20]

Only complete tokens match; bluebird does not.

Example 2

commentIds = [41,7,20]comments = ["red bird","bluebird red","blue bird"]word = "bird"mode = "SUBSTRING"return = [41,7,20]

The substring follow-up also matches bluebird.

Example 3

commentIds = [8,3]comments = ["green green","blue"]word = "green"mode = "WORD"return = [8]

Repeated occurrences in one comment still produce one ID.

Constraints

0 <= commentIds.length = comments.length <= 1000.
Comment IDs are unique integers between 0 and 10^9.
The total number of text characters is at most 10^5.
1 <= word.length <= 100.
Texts contain lowercase English letters and spaces; the query contains lowercase English letters only.
mode is WORD or SUBSTRING.