HackerRank

Random HackerRank challenges

Java

Strings

• Aho-Corasick aka "Determining DNA Health" at HR HARD
• Lexicographically Minimal Splice aka "Morgan and a String" at HR EXPERT
• Regex Count aka "Count Strings" at HR HARD

Graphs

• Cut the Tree at HR MEDIUM
• Graph Components aka "Journey to the Moon" at HR MEDIUM

Binary Search Trees

• Add, delete, k^th largest aka "Delete k^th largest node from a BST" at HR EXPERT
• Lowest Common Ancestor at HR EASY

Sorting

• Counting Sort Median aka "Fraudulent Activity Notifications" at HR MEDIUM

Dynamic Programming

• The Maximum Subarray at HR MEDIUM

C++

See HackerRank.cpp repo