Solutions for Hackerrank challenges

These are my solutions and may not be the best solution. Feel free to suggest inprovements.

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Here is the list of C# solutions.

Counting Valleys

Jumping on the Clouds

Repeated String

Flipping the Matrix

Hash Tables: Ransom Note

Sherlock and Anagrams

Sorting: Bubble Sort

Fraudulent Activity Notifications

Merge Sort: Counting Inversions

Sorting: Comparator

Frequency Queries

Arrays: Left Rotation

Minimum Swaps 2

Array Manipulation

Strings: Making Anagrams

Alternating Characters

Sherlock and the Valid String

Special String Again

Minimum Absolute Difference in an Array

Reverse Shuffle Merge

Hash Tables: Ice Cream Parlor

Minimum Time Required

Maximum Subarray Sum

Crossword Puzzle

Recursive Digit Sum

Castle on the Grid

Largest Rectangle

Balanced Brackets

Recursion: Davis' Staircase

Find the nearest clone

Poisonous Plants

Balanced Forest

Kruskal (MST): Really Special Subtree

Connected Cells in a Grid

DFS: Connected Cell in a Grid

Time Complexity: Primality

Friend Circle Queries

Climbing the Leaderboard

The Hurdle Race

Extra Long Factorials

Non-Divisible Subset

Queen's Attack II

Organizing Containers of Balls

Bigger is Greater

Morgan and a String

Find Merge Point of Two Lists

Recursion: Fibonacci Numbers

Project Euler #244: Sliders

Cycle Detection

Swap Nodes [Algo]

Queues: A Tale of Two Stacks

Snakes and Ladders: The Quickest Way Up

The Coin Change Problem

Sherlock and Cost

Construct the Array

Sam and Substrings

Forming a Magic Square

The Time in Words

Matrix Layer Rotation

Absolute Permutation