• Java
• Scala
• SQL
• Algorithms

Java

Subdomain	Challenge	Points	Solution
Introduction	Java Datatypes	10	Solution.java
Introduction	Java Output Formatting	10	Solution.java
Introduction	Java Static Initializer Block	10	Solution.java
Introduction	Java Date and Time	15	Solution.java
Introduction	Java Currency Formatter	15	Solution.java
Strings	Java Anagrams	10	Solution.java
Strings	Java String Reverse	10	Solution.java
Strings	Java Substring Comparisions	10	Solution.java
Strings	Java Regex	25	Solution.java
Strings	Java Regex 2 - Duplicate Words	25	Solution.java
Strings	Pattern Syntax Checker	20	Solution.java
Strings	Valid Username Regular Expression	20	Solution.java
Strings	Tag Content Extractor	20	Solution.java
BigNumber	Java BigDecimal	20	Solution.java
BigNumber	Java Primality Test	20	Solution.java
Data Structures	Java Comparator	10	Solution.java
Data Structures	Java Subarray	10	Solution.java
Data Structures	Java Arraylist	10	Solution.java
Data Structures	Java 2D Array	10	Solution.java
Data Structures	Java Sort	10	Solution.java
Data Structures	Java BitSet	20	Solution.java
Advanced	Prime Checker	25	Solution.java
Advanced	Java Singleton Pattern	15	Solution.java
Advanced	Java Annotations	25	Solution.java
Advanced	Covariant Return Types	20	Solution.java
Advanced	Java Lambda Expressions	30	Solution.java
Advanced	Java MD5	30	Solution.java
Advanced	Java SHA-256	30	Solution.java

Scala

Subdomain	Challenge	Points	Solution
Introduction	List Replication	10	Solution.java
Introduction	Filter Array	10	Solution.java
Introduction	Filter Positions in a List	10	Solution.java

SQL

Subdomain	Challenge	Points	Solution
Basic Select	Weather Observation Station 6	10	Solution.sql
Basic Select	Weather Observation Station 7	10	Solution.sql
Basic Select	Weather Observation Station 8	15	Solution.sql
Basic Select	Weather Observation Station 9	10	Solution.sql
Basic Select	Weather Observation Station 10	10	Solution.sql
Basic Select	Weather Observation Station 11	15	Solution.sql
Basic Select	Weather Observation Station 12	15	Solution.sql
Basic Select	Higher Than 75 Marks	15	Solution.sql
Advanced Select	Type of Triangle	20	Solution.sql
Advanced Select	The PADS	30	Solution.sql
Advanced Select	Occupations	30	Solution.sql
Advanced Select	Binary Tree Nodes	30	Solution.sql
Advanced Select	New Companies	30	Solution.sql
Aggregation	The Blunder	15	Solution.sql
Aggregation	Top Earners	20	Solution.sql
Aggregation	Weather Observation Station 2	15	Solution.sql
Aggregation	Weather Observation Station 15	15	Solution.sql
Aggregation	Weather Observation Station 16	10	Solution.sql
Aggregation	Weather Observation Station 17	15	Solution.sql
Aggregation	Weather Observation Station 18	25	Solution.sql
Aggregation	Weather Observation Station 19	30	Solution.sql
Aggregation	Weather Observation Station 20	40	Solution.sql
Basic Join	Average Population of Each Continent	10	Solution.sql
Basic Join	The Report	20	Solution.sql
Basic Join	Top Conpetitors	30	Solution.sql
Basic Join	Ollivander's Inventory	30	Solution.sql
Basic Join	Contest Leaderboard	30	Solution.sql
Alternative Queries	Draw The Triangle 1	25	Solution.sql
Alternative Queries	Draw The Triangle 2	25	Solution.sql
Advanced Join	Placements	40	Solution.sql
Advanced Join	Symmetric Pairs	40	Solution.sql
Advanced Join	Interviews	50	Solution.sql

Algorithms

Subdomain	Challenge	Points	Solution
Warmup	Staircase	10	Solution.java
Warmup	Mini-Max Sum	10	Solution.java
Warmup	Birthday Cake Candles	10	Solution.java
Warmup	Time Conversion	15	Solution.java