Delete Duplicate Folders in System problem solved

Author: hasibulislam999

Game Theory/1948_delete-duplicate-folders-in-system.js

@@ -0,0 +1,64 @@
+/**
+ * Title: Delete Duplicate Folders in System
+ * Description: Due to a bug, there are many duplicate folders in a file system. You are given a 2D array paths, where paths[i] is an array representing an absolute path to the ith folder in the file system.
+ * Author: Hasibul Islam
+ * Date: 06/05/2023
+ */
+
+/**
+ * @param {string[][]} paths
+ * @return {string[][]}
+ */
+class Node {
+  constructor(val, parent) {
+    (this.val = val), (this.parent = parent), (this.children = {}), this.hash;
+  }
+}
+class Trie {
+  constructor() {
+    this.root = new Node("");
+    this.hashMemo = {};
+  }
+  insert(path) {
+    let cur = this.root;
+    for (let node of path)
+      if (cur.children[node] !== undefined) cur = cur.children[node];
+      else
+        (cur.children[node] = new Node(node, cur)), (cur = cur.children[node]);
+  }
+  traverse(node = this.root) {
+    node.hash = [];
+    if (node.children)
+      for (let child of Object.values(node.children))
+        node.hash.push(this.traverse(child));
+    node.hash = node.hash.join("~");
+    if (node.hash !== "") {
+      if (this.hashMemo[node.hash] === undefined) this.hashMemo[node.hash] = [];
+      this.hashMemo[node.hash].push(node);
+      return node.val + "/[" + node.hash + "]";
+    }
+    return node.val;
+  }
+  delete(node = this.root) {
+    if (!node || node.hash === undefined) return;
+    else if (this.hashMemo[node.hash] && this.hashMemo[node.hash].length > 1)
+      for (let todelete of this.hashMemo[node.hash])
+        delete todelete.parent.children[todelete.val];
+    else for (let child of Object.values(node.children)) this.delete(child);
+  }
+  serialize(node = this.root, stack = [], res = []) {
+    if (node.val !== "") stack.push(node.val), res.push([...stack]);
+    for (let child of Object.values(node.children))
+      this.serialize(child, stack, res);
+    stack.pop();
+    return res;
+  }
+}
+
+var deleteDuplicateFolder = function (paths) {
+  let T = new Trie();
+  for (let P of paths) T.insert(P);
+  T.traverse();
+  T.delete();
+  return T.serialize();
+};