Day 1

Day 01/Part 1/index.ts

@@ -0,0 +1,37 @@
+import fs from 'node:fs';
+
+const listOne: number[] = [];
+const listTwo: number[] = [];
+const listDiff: number[] = [];
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    data.split('\n').forEach(line => {
+      const spLine = line.split('   ');
+      if (!spLine[0] || !spLine[1]) throw new Error()
+      listOne.push(parseInt(spLine[0]))
+      listTwo.push(parseInt(spLine[1]))
+    })
+
+    listOne.sort((a, b) => a - b)
+    listTwo.sort((a, b) => a - b)
+
+    if (listOne.length != listTwo.length || !listOne || !listTwo) {
+      throw `Different length of list \n 01: ${listOne.length}, 02: ${listTwo.length}`
+    }
+
+    for (let i = 0; i < listTwo.length; i++) {
+      let diff = ((listOne[i] ?? 0) - (listTwo[i] ?? 0));
+      if (diff < 0) diff *= -1
+      listDiff.push(diff)
+    }
+
+    let sum = 0;
+    listDiff.forEach(value => {
+      sum += value
+    })
+
+    console.log(sum)
+  })
+}

Day 01/Part 2/index.ts

@@ -0,0 +1,36 @@
+import fs from 'node:fs';
+
+const listOne: number[] = [];
+const listTwo: number[] = [];
+const map: Map<number, number> = new Map();
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    data.split('\n').forEach(line => {
+      const spLine = line.split('   ');
+      if (!spLine[0] || !spLine[1]) throw new Error()
+      listOne.push(parseInt(spLine[0]))
+      listTwo.push(parseInt(spLine[1]))
+    })
+
+    for(let i = 0; i<listTwo.length; i++){
+      let k = listTwo[i] ?? 0;
+      let v = 0;
+      if(map.has(k)) v = map.get(k) ?? 0
+      v++
+      map.set(k, v);
+    }
+
+    let sum = 0
+
+    for(let i = 0; i<listOne.length; i++){
+      let v = listOne[i] ?? 0
+      if(!map.has(v)) continue;
+      let n = v*(map.get(v)??0);
+
+      sum += n;
+    }
+    console.log(sum)
+  })
+}