Create 0872-leaf-similar-trees.js

Author: aadil42

Diff for: javascript/0872-leaf-similar-trees.js

@@ -0,0 +1,40 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * DFS | Preorder Traversal
+ * Time O(n) | Space  O(n)
+ * https://leetcode.com/problems/leaf-similar-trees/
+ * @param {TreeNode} root1
+ * @param {TreeNode} root2
+ * @return {boolean}
+ */
+var leafSimilar = function(root1, root2) {
+
+    const dfs = (node, arr) => {
+        if(!node.left && !node.right) {
+            arr.push(node.val);
+            return arr;
+        }
+        if(node.left) dfs(node.left, arr);
+        if(node.right) dfs(node.right, arr);
+
+        return arr;
+    }
+
+    const arr1 = dfs(root1, []);
+    const arr2 = dfs(root2, []);
+
+    if(arr1.length !== arr2.length) return false;
+
+    for(let i = 0; i < arr1.length; i++) {
+        if(arr1[i] !== arr2[i]) return false;
+    }
+
+    return true;
+};