[ PS ] : Clone Graph

Author: uraflower

clone-graph/uraflower.js

@@ -0,0 +1,31 @@
+// Definition for a _Node.
+function _Node(val, neighbors) {
+    this.val = val === undefined ? 0 : val;
+    this.neighbors = neighbors === undefined ? [] : neighbors;
+};
+
+/**
+ * 그래프를 깊은 복사하여 반환하는 함수
+ * @param {_Node} node
+ * @return {_Node}
+ */
+const cloneGraph = function (node) {
+    if (!node) return null;
+
+    function dfs(node, visited) {
+        const current = new _Node(node.val);
+        visited.set(node, current);
+
+        node.neighbors.forEach((neighbor) => {
+            const clonedNeighbor = visited.has(neighbor) ? visited.get(neighbor) : dfs(neighbor, visited);
+            current.neighbors.push(clonedNeighbor);
+        });
+
+        return current;
+    }
+
+    return dfs(node, new Map()); // visited: 원본 노드를 key, 클론한 노드를 value로 하는 맵
+};
+
+// 시간복잡도: O(V + E) (모든 노드와 간선을 한 번씩 순회)
+// 공간복잡도: O(V) (visited 맵 + 재귀 호출 스택)