.

2021/7.js

@@ -0,0 +1,15 @@
+function day7(input, part2) {
+    input = input.split(",").num()
+
+    let max = input.max()
+    let costs = []
+
+    for (let i = 0; i < max; i++) {
+        costs[i] = input.map((e) => {
+            let dist = Math.abs(e - i)
+            return part2 ? dist * (dist + 1) / 2 : dist
+        }).sum()
+    }
+
+    return costs.min()
+}

2021/8.js

@@ -0,0 +1,32 @@
+function day8(input, part2) {
+    let lines = input.split("\n").map((e) => e.split(" ").splitOnElement("|").map((e) => e.map((e) => e.split("").sort())))
+
+    if (!part2) {
+        return lines.map((e) => e[1].count((e) => [2, 4, 3, 7].includes(e.length))).sum()
+    }
+
+    let sum = 0
+
+    for (let line of lines) {
+        let samples = line.flat()
+
+        let n1 = samples.find((e) => e.length == 2)
+        let n7 = samples.find((e) => e.length == 3)
+        let n4 = samples.find((e) => e.length == 4)
+        let a235 = samples.filter((e) => e.length == 5)
+        let a069 = samples.filter((e) => e.length == 6)
+        let n8 = samples.find((e) => e.length == 7)
+
+        let n6 = a069.find((e) => n1.sub(e).length == 1)
+        let n9 = a069.find((e) => n4.sub(e).length == 0)
+        let n0 = a069.find((e) => e != n6 && e != n9)
+
+        let n2 = a235.find((e) => n4.sub(e).length == 2)
+        let n3 = a235.find((e) => n1.sub(e).length == 0)
+        let n5 = a235.find((e) => e != n2 && e != n3)
+
+        sum += +line[1].map((e) => [n0, n1, n2, n3, n4, n5, n6, n7, n8, n9].findIndex((n) => n.join("") == e.join(""))).join("")
+    }
+
+    return sum
+}