2020 Account Balance with Monthly Card Fees
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DRWFULLTIMEOAProblem statement
An account records transactions during calendar year 2020. Arrays A and D describe the transactions: A[i] is the signed amount, and D[i] is its date in YYYY-MM-DD format.
Every amount contributes directly to the account balance. A negative amount is a card payment.
The account normally pays a fee of 5 for each of the twelve months. The fee for a month is waived only when that month contains at least three card payments whose combined absolute value is at least 100.
Starting from balance 0, return the final balance after all transactions and all applicable monthly fees.
Function
solution(A: int[], D: String[]) → intExamples
Example 1
A = [100,-30,-40,-30]D = ["2020-01-01","2020-01-10","2020-01-20","2020-01-30"]return = -55The transaction amounts sum to 0. January has three card payments totaling 100, so its fee is waived. The other eleven monthly fees total 55.
Example 2
A = [100]D = ["2020-12-01"]return = 40No month qualifies for a waiver, so twelve fees totaling 60 are subtracted from the transaction total of 100.
Constraints
A.length == D.length.- Every value in
Dis a valid date in calendar year2020usingYYYY-MM-DDformat.