Day 11 Mark

day 11/day_11_mark.js

+range = x => [...Array(x).keys()]
+
+stones = input.split(' ').map(Number)
+
+blink = () => {
+	newStones = stones
+	stones.map((x,i) => {
+		if(x == 0){
+			newStones[i] = 1
+		} else {
+			word = x.toString()
+			if(word.length % 2 == 0){
+				newStones[i] = Number(word.substring(0, word.length/2)) + ' ' + Number(word.substring(word.length/2))
+			} else {
+				newStones[i] = x*2024
+			}
+		}
+	})
+	stones = newStones.join(' ').split(' ')
+	//console.log(stones.join(' '))
+}
+
+range(25).map(blink)
+
+output1 = stones.length
+
+////
+
+evolution = {}
+evolution[0] = [1]
+
+revealEvolution = stone => {
+	if(!Object.keys(evolution).includes(stone.toString())){
+		word = stone.toString()
+		if(word.length % 2 == 0){
+			evolution[stone.toString()] = [Number(word.substring(0, word.length/2)), Number(word.substring(word.length/2))]
+		} else {
+			evolution[stone.toString()] = [stone * 2024]
+		}
+	}
+	return evolution[stone.toString()]
+}
+
+evolutionStep = (stone, step) => {
+	if(step > 0 && !evolution[stone.toString()]){
+		revealEvolution(stone).map(x => evolutionStep(x, step-1))
+	}
+}
+
+input.split(' ').map(Number).map(stone => evolutionStep(stone, 75))
+
+x0 = {}
+
+input.split(' ').map(Number).map(stone => x0[stone] = 1)
+
+iteration = (x, step) => {
+	if(step > 0){
+		x1 = {}
+		Object.keys(x).map(k => revealEvolution(k.toString()).map(y => x1[y] ? x1[y] += x[k] : x1[y] = x[k]))
+		return iteration(x1, step-1)
+	} else {
+		return x
+	}
+}
+
+x1 = iteration(x0, 75)
+
+output1 = Object.keys(x1).reduce((t,k) => t + x1[k],0) 
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