Solving code from HackerRank.
1 - 2D Array
2 - Equal
3 - Grid Search
4 - Almost Sorted
5 - Bfs Shortest Reach
6 - Pairs
7 - Sherlock And Validate String
8 - Flipping Bits
9 - Common child
10 - Neetcode Contains Duplicate
11 - Neetcode Valid Anagram
12 - Neetcode 3sum
13 - Valid Parentheses
14 - Invert Binary Tree
15 - Minimum Stack
16 - Reversed Linked List
17 - Merge Two Sorted List
18 - Maximum Depth
19 - Prefix Tree
20 - Longest Substring Without Repeating Characters
21 - Linked List Cycle Detection
22 - Search Matrix
23 - Diameter of Binary Tree
24 - Balanced Binary Tree
25 - Same Binary Tree
26 - Reorderd Linked List
27 - Kth Largest Element in a Stream
28 - Number of Islands
29 - Last Stone Weight
30 - Remove Nth Node from the end of the List
28 - Number of Islands
29 - Number of Islands
30 - plusOne
31 - Climbing Tree