# Status Problem video Level Completes Likes 121 Print All the Subsets of a Given Set (Power Set) Hard % 1 116 Generate All Balanced Parentheses Combinations (N Pairs) Medium % 1 112 Generate All n-Bit Binary Strings Medium % 1 108 Queue with Stacks: Efficient Implementation Using Stack Operations Medium % 0 106 Reverse a Doubly-Linked List (In-place Algorithm) Medium % 0 102 Merge Sort for Linked Lists (In-place Algorithm) Medium % 0 101 Merge a Linked list into another Linked List at Alternate Positions Medium % 0 99 Construct a binary tree from given Inorder and Level Order Traversal Hard % 0 96 Print The Top View of a Binary Tree Medium % 0 93 Inorder Predecessor and Successor in Binary Search Tree Hard % 0 88 Rearrange Array: Positive and Negative Elements Alternating Hard % 0 86 Find Kth Smallest or Largest element in an Array Medium % 0 83 Find Element in Rotated Sorted Array Medium % 0 82 Find Nodes at Distance X from a Given Node in a Tree Hard % 0 81 Find Nodes X Levels Up from Leaf Nodes in a Tree Medium % 0 80 Find Nodes at Distance X from Root in a Tree Medium % 0 74 Lowest Common Ancestor in a Binary Tree (Not Binary Search Tree). Hard % 0 73 Lowest Common Ancestor in a Binary Search Tree. Medium % 0 69 Convert Sorted Singly Linked List to Balanced Binary Search Tree Medium % 1 65 Given a binary tree, Find the Maximum Path Sum between Any Two Leaves Medium % 0 57 Sort an Array According to the Order Defined by Another Array Medium % 0 56 Sort an Array - odd numbers appear first in ascending order followed by the even numbers in descending order. Medium % 0 51 Print Binary Tree Nodes in Zigzag Order: Spiral Traversal Pattern Hard % 0 50 Find the first repeated element in an array by its index Medium % 0 46 Check if One Binary Tree is a Subtree of Another Medium % 0 40 In a Binary Tree, Create Linked Lists of all the nodes at each depth Hard % 0 39 Level Order Traversal, Print each level in separate line Medium % 0 30 Swap Every Kth Node in a LinkedList Medium % 0 27 Remove Duplicates from an Unsorted Linked list Beginner % 0 25 String Compression using count of repeated characters - Run Length Encoding Beginner % 0 24 Replace Spaces with '%20' Without Using Default Functions Medium % 0 23 Find Whether Two Strings are Permutation of each other Beginner % 1 22 Find Intersection Point in Two Linked Lists Medium % 0 15 Efficiently Rearrange Positive and Negative Numbers in Array on Each Side Hard % 0 12 Efficient Methods to Find Pairs with Sum K in an Array Beginner % 0 Print All the Subsets of a Given Set (Power Set) Generate All Balanced Parentheses Combinations (N Pairs) Generate All n-Bit Binary Strings Queue with Stacks: Efficient Implementation Using Stack Operations Reverse a Doubly-Linked List (In-place Algorithm) Merge Sort for Linked Lists (In-place Algorithm) Merge a Linked list into another Linked List at Alternate Positions Construct a binary tree from given Inorder and Level Order Traversal Print The Top View of a Binary Tree Inorder Predecessor and Successor in Binary Search Tree Rearrange Array: Positive and Negative Elements Alternating Find Kth Smallest or Largest element in an Array Find Element in Rotated Sorted Array Find Nodes at Distance X from a Given Node in a Tree Find Nodes X Levels Up from Leaf Nodes in a Tree Find Nodes at Distance X from Root in a Tree Lowest Common Ancestor in a Binary Tree (Not Binary Search Tree). Lowest Common Ancestor in a Binary Search Tree. Convert Sorted Singly Linked List to Balanced Binary Search Tree Given a binary tree, Find the Maximum Path Sum between Any Two Leaves Sort an Array According to the Order Defined by Another Array Sort an Array - odd numbers appear first in ascending order followed by the even numbers in descending order. Print Binary Tree Nodes in Zigzag Order: Spiral Traversal Pattern Find the first repeated element in an array by its index Check if One Binary Tree is a Subtree of Another In a Binary Tree, Create Linked Lists of all the nodes at each depth Level Order Traversal, Print each level in separate line Swap Every Kth Node in a LinkedList Remove Duplicates from an Unsorted Linked list String Compression using count of repeated characters - Run Length Encoding Replace Spaces with '%20' Without Using Default Functions Find Whether Two Strings are Permutation of each other Find Intersection Point in Two Linked Lists Efficiently Rearrange Positive and Negative Numbers in Array on Each Side Efficient Methods to Find Pairs with Sum K in an Array 1 2 3 4 5
