Day 23 Part 2

2024/23/index2.ts

@@ -0,0 +1,48 @@
+const fs = require('fs');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+const connections: { [key: string]: Array<string> }= {};
+
+input.split("\n").forEach((conn: string) => {
+    const [c1, c2] = conn.split('-');
+    connections[c1] = [c2, ...(connections[c1] || [])]
+    connections[c2] = [c1, ...(connections[c2] || [])]
+});
+
+let nets: Set<string> = new Set;
+
+for (let key in connections) {
+    const conns = connections[key];
+    conns.forEach((c2) => {
+        connections[c2].forEach((c3) => {
+            if (connections[c3].includes(key)) {
+                const arr = [key, c2, c3];
+                arr.sort();
+                nets.add(arr.join(','));
+            }
+        })
+    });
+}
+
+while (nets.size > 1) {
+    const nextNets: Set<string> = new Set;
+    for (let net of nets) {
+        const cps = net.split(',');
+        for (let i in connections) {
+            if (cps.includes(i)) {
+                continue;
+            }
+            const conns = connections[i];
+            if (cps.every((id) => conns.includes(id))) {
+                const newNet = [...cps, i];
+                newNet.sort();
+                nextNets.add(newNet.join(','));
+            }
+        }
+    }
+
+    nets = nextNets;
+}
+
+console.log(nets);