feat: SPEEDRUN day 4

Signed-off-by: Florian BOUILLON <f.bouillon@aptatio.com>

2023/day-4/part-2.ts

@@ -0,0 +1,37 @@
+// note: this runs using bun!
+const file = Bun.file('./input.txt')
+const text = await file.text()
+
+const games = text.split('\n')
+	.map((game) => {
+		const [prefix, data] = game.split(':', 2)
+		const [_, id] = prefix.split(/ +/g, 2)
+		const [winningListTxt, chosenListTxt] = data.split('|')
+		const winningNumbers = winningListTxt.trim().split(/ +/g).map((it) => parseInt(it.trim()))
+		const choseNumbers = chosenListTxt.trim().split(/ +/g).map((it) => parseInt(it.trim()))
+		const points = winningNumbers.reduce((p, c) => p + (choseNumbers.includes(c) ? 1 : 0), 0)
+		const finalPoints = Math.max(0, 1 << (points - 1))
+		return {
+			id: parseInt(id),
+			winning: winningNumbers,
+			chosen: choseNumbers,
+			score: points,
+			points: finalPoints
+		}
+	})
+
+function processGame(id: number) {
+	const game = games[id - 1]
+	let finalScore = 1
+	for (let idx = id; idx < id + game.score; idx++) {
+		finalScore += processGame(idx + 1)
+	}
+	return finalScore
+}
+
+let result = 0
+for (const game of games) {
+	console.log('processing game', game.id)
+	result += processGame(game.id)
+}
+console.log(result)