How should I practice Assign Sequential Loan Identifiers?

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

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Problem · Array

Assign Sequential Loan Identifiers

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● Easy

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Problem statement

Assign a loan identifier to every transaction in an ordered batch.

Process transactionRefs from left to right. The transaction at index i receives identifier i + 1. Each row receives a distinct identifier; repeated reference strings are still separate transactions.

Return the assigned identifiers in the same order as the input transactions.

Function

assignLoanIds(transactionRefs: String[]) → int[]

Examples

Example 1

transactionRefs = ["txn-a","txn-b","txn-c","txn-d"]return = [1,2,3,4]

The transactions receive consecutive identifiers in input order.

Example 2

transactionRefs = ["retry","retry","settled"]return = [1,2,3]

Each transaction row receives its own identifier, even when reference strings repeat.

Example 3

transactionRefs = ["only-transaction"]return = [1]

The first transaction receives identifier 1.

Constraints

1 <= transactionRefs.length <= 100000.
Every transaction reference is a nonempty string of at most 100 characters.
The returned identifiers fit in a signed 32-bit integer.