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export const cardOrder = "A, K, Q, J, T, 9, 8, 7, 6, 5, 4, 3, 2"
.split(", ")
.reverse();
export const score = (hand: string) => {
const cards = hand.split("");
// five of a kind
if (hand.match(new RegExp(cards[0], "g"))?.length === cards.length) return 6;
// four of a kind
for (const card of cards) {
if (hand.match(new RegExp(card, "g"))?.length === 4) return 5;
}
// full house
let threeMatching = cards.some(
(card) => hand.match(new RegExp(card, "g"))?.length === 3
);
let twoMatching = cards.find(
(card) => hand.match(new RegExp(card, "g"))?.length === 2
);
if (threeMatching && twoMatching) return 4;
if (threeMatching) return 3;
let twoMatchingUnique = cards.find(
(card) =>
card !== twoMatching && hand.match(new RegExp(card, "g"))?.length === 2
);
if (twoMatchingUnique) return 2;
if (twoMatching) return 1;
return 0;
};
export const main = async (lines: string[]): Promise<number | string> => {
const hands: { hand: string; bid: number }[] = lines
.map((line) => {
const [hand, bidS] = line.split(" ");
const bid = parseInt(bidS);
return { hand, bid };
})
.sort(({ hand: handOne }, { hand: handTwo }) => {
const scoreOne = score(handOne);
const scoreTwo = score(handTwo);
if (scoreOne === scoreTwo) {
let [cardOneScore, cardTwoScore] = [-1, -1];
let i = 0;
while (cardOneScore === cardTwoScore && i < handOne.length) {
cardOneScore = cardOrder.indexOf(handOne[i]);
cardTwoScore = cardOrder.indexOf(handTwo[i]);
i++;
}
return cardOneScore - cardTwoScore;
}
return scoreOne - scoreTwo;
});
return hands.reduce((acc, { bid }, i) => acc + bid * (i + 1), 0);
};
//
const isrun = process.argv.length > 1 && process.argv[1] === import.meta.path;
if (isrun) {
const file = Bun.file("./problem.txt");
const text = await file.text();
const lines = text.split("\n").filter((x) => x && x.length);
console.log("=== COMPUTATION ===\n");
const answer = await main(lines);
console.log("\n=== /COMPUTATION ===\n");
console.log("=== ANSWER TO P1 ===");
console.log(answer);
}
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