Virtual Card Transaction Validator

Determine whether a transaction may be authorized for a virtual card.
A transaction is valid exactly when the card is active, transactionDay is no later than expirationDay, the amount is positive, and the amount does not exceed remainingLimit.

Function
isVirtualCardTransactionValid(active: boolean, expirationDay: int, transactionDay: int, remainingLimit: int, amount: int) → boolean

Examples
Example 1
active = true
expirationDay = 30
transactionDay = 20
remainingLimit = 500
amount = 120
return = true
The active card has not expired and has enough remaining limit.
Example 2
active = true
expirationDay = 30
transactionDay = 31
remainingLimit = 500
amount = 120
return = false
The transaction occurs after the expiration day.
Example 3
active = false
expirationDay = 30
transactionDay = 20
remainingLimit = 500
amount = 120
return = false
An inactive card cannot authorize a transaction.

Constraints
0 <= transactionDay, expirationDay <= 10^9.
0 <= remainingLimit <= 10^9.
-10^9 <= amount <= 10^9.

There's no algorithm here. It's four conditions joined with AND, and the whole game is getting each comparison exactly right. Active must be true. transactionDay <= expirationDay, so a transaction on the expiration day is valid, and using strict less-than breaks it. amount > 0, so zero and negative amounts are invalid, and the constraints explicitly allow negatives down to -10^9. amount <= remainingLimit, so spending exactly the remaining limit is valid. The common pitfall is only checking the limit and forgetting that a negative amount is always under it. Another is off-by-one on the day check. Values reach 10^9, so nothing overflows a 32-bit int in these comparisons, but don't add or subtract them anyway. Return the single boolean expression directly. If your head goes foggy mid-assessment, StealthCoder can read the prompt and hand you the clean one-liner.

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