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Huffman coding in Java

This is a very decent coding exercise to sharpen your coding skills. Nicely explained with diagrams and complete code. Q1. What is Huffman coding? A1. Huffman coding is a compression technique used to reduce the number of bits needed to send or store a message. For example, if you have…...

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Sorting a list of numbers by frequencies in Java using a BST tree

This extends Sorting a list of numbers by frequencies in Java using a map to use a BST instead of a Map. PROBLEM to solve: Sort a list of numbers by frequency of their occurrences. For example INPUT: [ 5, 3, 7, 7, 7, 5, 4, 8 ] OUTPUT: [7,

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Sorting a list of numbers by frequencies in Java using a map

PROBLEM to solve: Sort a a list of numbers by frequency of their occurrences. For example INPUT: [ 5, 3, 7, 7, 7, 5, 4, 8 ] OUTPUT: [7, 7, 7, 5, 5, 3, 4, 8] ALGORITHM to use 1. Group the list by count. You can do this by…...

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Generating random numbers in Java

Q1. Can you write Java code to generate random numbers between a given range? A1. E.g. 0 and 9 or 5 to 35, and so on.

The “nextInt()” method works from “0” onwards. So, “rand.nextInt(9)” will return 9 numbers between 0 and 8 inclusive. To start with 1, add…...

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♥ Finding the missing numbers Java example

Q. Can you write code to identify missing numbers in a given array of numbers? Solution 1: Assuming that the given numbers are in order

Output:

The above solution assumes that the numbers are in order (i.e. sorted). What if the numbers are random? Solution 2: Numbers are

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♥ ♦ Java coding practice problems – prime and powerful

There is no other way to pass the Java coding tests other than practicing. I have failed Java coding tests due to lack of practice. How often do you get work with tree and graph data structures? Ho often do you work with algorithms? 50+ Java coding practice problems Links:

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Posted in Algorithms, Can you write code?
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♦ Splitting input text & string processing coding Q&A

Q1. Can you write code to extract numbers from a given input text and return the sum of those numbers? Example: “1 some text 2 more text 4 more text 8” should return 15 as the sum. A The key steps are: 1. Split the given input into tokens. Split…...

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♦ Finding the perfect number

Q. Can you write code to output the perfect number between a given range? Definition: A perfect number is a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers…...

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