add third day

3.2.ts

@@ -0,0 +1,47 @@
+import { open } from 'node:fs/promises';
+
+const file = await open('./inputs/3');
+let sum = 0
+let input = (await file.readFile()).toString().split('\n')
+let numbers : {value: number, indices: number[]}[][] = []
+
+input.forEach((line, index) => {
+    const regex1 = (/\d+/gmd);
+    let match;
+    numbers.push([])
+    while ((match = regex1.exec(line)) !== null) {
+        if(match.indices == undefined) throw new Error('no indices')
+        numbers[index].push({value:Number(match['0']),indices:match.indices[0]})
+    }
+})
+
+input.forEach((line, index) => {
+    const regex1 = (/\*/gm);
+    let match: RegExpExecArray | null;
+    while ((match = regex1.exec(line)) !== null) {
+        const partNumbers = []
+        if( match === null) throw new Error('match is null')
+
+        let part = numbers[index].find(e=>e.indices[1] == match!.index)
+        if(part !== undefined) partNumbers.push(part) 
+
+        part = numbers[index].find(e=>e.indices[0] == match!.index+1)
+        if(part !== undefined) partNumbers.push(part) 
+
+        if(index > 0){
+            const parts = numbers[index-1].filter(e=>e.indices[0] <= match!.index+1 && e.indices[1] >= match!.index)
+            partNumbers.push(...parts) 
+        }
+
+        if(index < input.length -1){
+            const parts = numbers[index+1].filter(e=>e.indices[0] <= match!.index+1 && e.indices[1] >= match!.index)
+            partNumbers.push(...parts) 
+        }
+        
+
+        if(partNumbers.length == 2){
+            sum += partNumbers[0].value * partNumbers[1].value 
+        }
+    }
+})
+console.log(sum)