Initial commit

day-1/day1-part2.ts

@@ -0,0 +1,38 @@
+import * as path from 'path'
+
+export async function day1Part2() {
+    const start = performance.now()
+    const input = await Bun.file(path.join(__dirname, 'input.txt')).text()
+    const lines = input.split('\n')
+    const column1: number[] = []
+    const column2Map = new Map()
+
+    for (const line of lines) {
+        const [left, right] = line.split('   ')
+        const n1 = Number.parseInt(left, 10)
+        const n2 = Number.parseInt(right, 10)
+        column1.push(n1)
+
+        if (column2Map.has(n2)) {
+            const v = column2Map.get(n2)
+            column2Map.set(n2, v + 1)
+        } else {
+            column2Map.set(n2, 1)
+        }
+    }
+
+    let result = 0
+    for (let i = 0; i < column1.length; i++) {
+        const left = column1[i]
+        if(!column2Map.has(left)){
+            continue
+        }
+        const multiplier = column2Map.get(left)
+
+        result += multiplier * left
+    }
+
+    const end = performance.now()
+
+    console.log({result, time: end - start})
+}