• Java
• Python
• SQL
• Regex

Java

Subdomains

• Introduction
• Data Structures
• Object Oriented Programming
• Exception Handling
• Strings

Java Introduction

Number	Challenge	Points	Solution
1	Welcome to Java!	3	Java
2	Java Stdin and Stdout I	5	Java
3	Java If-Else	10	Java
4	Java Stdin and Stdout II	10	Java
5	Java Output Formatting	10	Java
6	Java Loops I	10	Java
7	Java Loops II	10	Java
8	Java Datatypes	10	Java
9	Java End-of-file	10	Java
10	Java Static Initializer Block	10	Java
11	Java Int to String	10	Java
12	Java Date and Time	15	Java
13	Java Currency Formatter	15	Java

Data Structures

Number	Challenge	Points	Solution
1	Java 1D Array	5	Java
2	Java Subarray	10	Java
3	Java Arraylist	10	Java
4	Java 1D Array (Part 2)	25	Java
5	Java Hashset	10	Java
6	Java Generics	15	Java
7	Java Priority Queue	20	Java

Object Oriented Programming

Number	Challenge	Points	Solution
1	Java Inheritance I	5	Java
2	Java Inheritance II	10	Java
3	Java Abstract Class	10	Java
4	Java Interface	10	Java
5	Java Method Overriding	10	Java

Exception Handling

Number	Challenge	Points	Solution
1	Java Exception Handling (Try-catch)	10	Java
2	Java Exception Handling	15	Java

Java Strings

Number	Challenge	Points	Solution
1	Java Strings Introduction	5	Java
2	Java Substring	5	Java
3	Java Substring Comparisons	10	Java
4	Java String Reverse	10	Java
5	Java Anagrams	10	Java
6	Java String Tokens	15	Java
7	Pattern Syntax Checker	20	Java
8	Java Regex	25	Java

Python

Subdomains

• Introduction
• Basic Data Types
• Strings

Python Introduction

Number	Challenge	Points	Solution
1	Say "Hello, World!" With Python	5	Python
2	Python If-Else	10	Python
3	Arithmetic Operators	10	Python
4	Python: Division	10	Python
5	Loops	10	Python
6	Write a function	10	Python
7	Print Function	20	Python

Basic Data Types

Number	Challenge	Points	Solution
1	List Comprehensions	10	Python
2	Find the Runner-Up Score!	10	Python
3	Nested Lists	10	Python
4	Finding the percentage	10	Python
5	Lists	10	Python
6	Tuples	10	Python

Python Strings

Number	Challenge	Points	Solution
1	sWAP cASE	10	Python
2	String Split and Join	10	Python
3	What's Your Name?	10	Python
4	Mutations	10	Python
5	Find a string	10	Python
6	String Validation	10	Python
7	Text Alignment	10	Python
8	Text Wrap	10	Python
9	Designer Door Mat	10	Python
10	String Formatting	10	Python
11	Alphabet Rangoli	20	Python
12	Capitalize!	20	Python
13	The Minion Game	40	Python
14	Merge the Tools!	40	Python

SQL

Subdomains

• Basic Select
• Advanced Select
• Aggregation
• Basic Join

Basic Select

Number	Challenge	Points	Solution
1	Revising the Select Query I	10	MySQL
2	Revising the Select Query II	10	MySQL
3	Select All	10	MySQL
4	Select By ID	10	MySQL
5	Japanese Cities' Attributes	10	MySQL
6	Japanese Cities' Names	10	MySQL
7	Weather Observation Station 1	15	MySQL
8	Weather Observation Station 3	10	MySQL
9	Weather Observation Station 4	10	MySQL
10	Weather Observation Station 5	30	MySQL
11	Weather Observation Station 6	10	MySQL
12	Weather Observation Station 7	10	MySQL
13	Weather Observation Station 8	15	MySQL
14	Weather Observation Station 9	10	MySQL
15	Weather Observation Station 10	10	MySQL
16	Weather Observation Station 11	15	MySQL
17	Weather Observation Station 12	15	MySQL
18	Higher Than 75 Marks	15	MySQL
19	Employee Names	10	MySQL
20	Employee Salaries	10	MySQL

Advanced Select

Number	Challenge	Points	Solution
1	Type of Triangle	20	MySQL

Aggregation

Number	Challenge	Points	Solution
1	Revising Aggregations - The Count Function	10	MySQL
2	Revising Aggregations - The Sum Function	10	MySQL
3	Revising Aggregations - Averages	10	MySQL
4	Average Population	10	MySQL
5	Japan Population	10	MySQL
6	Population Density Difference	10	MySQL
7	The Blunder	15	MySQL
8	Top Earners	20	MySQL
9	Weather Observation Station 2	15	MySQL
10	Weather Observation Station 13	10	MySQL
11	Weather Observation Station 14	10	MySQL
12	Weather Observation Station 15	15	MySQL
13	Weather Observation Station 16	10	MySQL
14	Weather Observation Station 17	15	MySQL
15	Weather Observation Station 18	25	MySQL
16	Weather Observation Station 19	30	MySQL
17	Weather Observation Station 20	40	MySQL

Basic Join

Number	Challenge	Points	Solution
1	Population Census	10	MySQL
2	African Cities	10	MySQL
3	Average Population of Each Continent	10	MySQL

Regex

Subdomains

• Introduction

Regex Introduction

Number	Challenge	Points	Solution
1	Matching Specific String	5	Python
2	Matching Anything But a Newline	5	Python
3	Matching Digits & Non-Digit Characters	5	Python
4	Matching Whitespace & Non-Whitespace Character	5	Python
5	Matching Word & Non-Word Character	5	Python
6	Matching Start & End	5	Python