diff --git a/baekjoon/16947(WIP).js b/baekjoon/16947(WIP).js
new file mode 100644
index 0000000..ddc9899
--- /dev/null
+++ b/baekjoon/16947(WIP).js
@@ -0,0 +1,26 @@
+// 서울 지하철 2호선
+const input = require("fs")
+  .readFileSync("/dev/stdin")
+  .toString()
+  .trim()
+  .split("\n")
+  .map((v) => v.split(" ").map((v) => Number(v)));
+const [n] = input.shift();
+const edges = input.map(([a, b]) => {
+  if (a < b) {
+    return [a, b];
+  } else {
+    return [b, a];
+  }
+});
+const next = new Array(n).fill(null).map(() => new Array(0));
+const count = new Array(n + 1).fill(0);
+
+for (const [a, b] of edges) {
+  next[a].push(b);
+  next[b].push(a);
+}
+
+console.log(next);
+
+// 순환 구간을 어떻게 판단?