How should I practice Wallet Balance on a Selected Day?

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

Is Wallet Balance on a Selected Day associated with BharatPe?

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Problem · Array

Wallet Balance on a Selected Day

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● Easy

BharatPeFULLTIMEPHONE SCREEN

Problem statement

A wallet starts with balance 0. Its daily transactions are stored in an integer array transactions: a positive value is a credit, a negative value is a debit, and zero makes no change.

Given a zero-based index selectedDay, return the wallet balance at the end of that day. Include every transaction from day 0 through selectedDay. Return a 64-bit integer.

Function

balanceOnDay(transactions: int[], selectedDay: int) → long

Examples

Example 1

transactions = [100,-30,20,-10]selectedDay = 2return = 90

After days 0 through 2, the balance is 100 - 30 + 20 = 90.

Example 2

transactions = [-50,80,-20]selectedDay = 0return = -50

Only the first day's debit is included.

Example 3

transactions = [5,0,-2,7]selectedDay = 3return = 10

The full history sums to 5 + 0 - 2 + 7 = 10.

Constraints

1 <= transactions.length <= 5000
-10^6 <= transactions[i] <= 10^6
0 <= selectedDay < transactions.length