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~ Problems
  ~ 104. Maximum Depth of Binary Tree
  ~ 112. Path Sum
  ~ 1448. Count Good Nodes in Binary Tree
  ~ 100. Same Tree
  ~ 236. Lowest Common Ancestor of a Binary Tree
  ~ 111. Minimum Depth of Binary Tree
  ~ 1026. Maximum Difference Between Node and Ancestor
  ~ 543. Diameter of Binary Tree
  ~ 199. Binary Tree Right Side View
  ~ 515. Find Largest Value in Each Tree Row
  ~ 1302. Deepest Leaves Sum
  ~ 103. Binary Tree Zigzag Level Order Traversal
  ~ 938. Range Sum of BST
  ~ 530. Minimum Absolute Difference in BST
  ~ 98. Validate Binary Search Tree
  ~ 701. Insert into a Binary Search Tree
  ~ 270. Closest Binary Search Tree Value
  ~ 547. Number of Provinces
  ~ 200. Number of Islands
  ~ 1466. Reorder Routes to Make All Paths Lead to the City Zero
  ~ 841. Keys and Rooms
  ~ 1557. Minimum Number of Vertices to Reach All Nodes
  ~ 1971. Find if Path Exists in Graph
  ~ 323. Number of Connected Components in an Undirected Graph
  ~ 695. Max Area of Island
  ~ 2368. Reachable Nodes With Restrictions
  ~ 1091. Shortest Path in Binary Matrix
  ~ 863. All Nodes Distance K in Binary Tree
  ~ 542. 01 Matrix
  ~ 1293. Shortest Path in a Grid with Obstacles Elimination
  ~ 1129. Shortest Path with Alternating Colors
  ~ 1926. Nearest Exit from Entrance in Maze
  ~ 909. Snakes and Ladders
  ~ 752. Open the Lock
  ~ 399. Evaluate Division
  ~ 433. Minimum Genetic Mutation
  ~ 1306. Jump Game III
  ~ 2101. Detonate the Maximum Bombs
  ~ 127. Word Ladder
  ~ 872. Leaf-Similar Trees
  ~ 226. Invert Binary Tree
  ~ 101. Symmetric Tree
  ~ 113. Path Sum II
  ~ 1325. Delete Leaves With a Given Value
  ~ 437. Path Sum III
  ~ 1372. Longest ZigZag Path in a Binary Tree
  ~ 102. Binary Tree Level Order Traversal
  ~ 1161. Maximum Level Sum of a Binary Tree
  ~ 637. Average of Levels in Binary Tree
  ~ 1609. Even Odd Tree
  ~ 700. Search in a Binary Search Tree
  ~ 1305. All Elements in Two Binary Search Trees
  ~ 235. Lowest Common Ancestor of a Binary Search Tree
  ~ 450. Delete Node in a BST
  ~ 997. Find the Town Judge
  ~ 1615. Maximal Network Rank
  ~ 463. Island Perimeter
  ~ 1020. Number of Enclaves
  ~ 1376. Time Needed to Inform All Employees
  ~ 2192. All Ancestors of a Node in a Directed Acyclic Graph
  ~ 990. Satisfiability of Equality Equations
  ~ 994. Rotting Oranges
  ~ 1268. Search Suggestions System
  ~ 208. Implement Trie (Prefix Tree)
  ~ 743. Network Delay Time
  ~ 787. Cheapest Flights Within K Stops