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Problem · Array

Evaluate a Blackjack Hand

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● Easy

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Problem statement

Given a blackjack hand in cards, return whether the cards can total exactly 21.

Cards 2 through 10 use their numeric values.
J, Q, and K each count as 10.
Each A may independently count as 1 or 11.

The hand may contain any positive number of cards.

Function

isBlackjack(cards: String[]) → boolean

Examples

Example 1

cards = ["A","K"]return = true

The Ace counts as 11, giving 21.

Example 2

cards = ["K","Q"]return = false

The total is 20.

Constraints

1 <= cards.length <= 52
Every card is one of A, 2 through 10, J, Q, or K.