How to Sort Array by Frequency in Java
The challenge
Sort elements in an array by decreasing frequency of elements. If two elements have the same frequency, sort them by increasing value. …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Calculate String Rotation in Java
The challenge
Write a function that receives two strings and returns n, where n is equal to the number of characters we should shift the first string …
Read Article →Compare Strings by Sum of Chars in Java
The challenge
Compare two strings by comparing the sum of their values (ASCII character code).
- For comparing treat all letters as UpperCase
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How to Add Two Integers Without Arithmetic Operator in Java
The challenge
Given two integers a, b, find The sum of them, BUT You are not allowed to use the operators + and –
- The numbers (a,b) may be positive …
Counting Method VarArgs in Java
The challenge
Count how many arguments a method is called with.
Examples
args_count(1, 2, 3) -> 3
args_count(1, 2, 3, 10) -> 4
The solution in …
Read Article →How to Sum Consecutives in Java
The challenge
You are given a list/array which contains only integers (positive and negative). Your job is to sum only the numbers that are the same …
Read Article →Replacing Occurences of Words in Java
The challenge
You are given a string. You must replace any occurrence of the sequence coverage by covfefe, however, if you don’t find the word …
Convert String to LeetSpeak in Java
The challenge
Your task is to write a function toLeetSpeak that converts a regular english sentence to Leetspeak.
More about LeetSpeak You can read at …
Read Article →Ordered Count of Characters in Python
The challenge
Count the number of occurrences of each character and return it as a list of tuples in order of appearance. For empty output return an …
Read Article →Credit Card Issuer Checking in Java
The challenge
Given a credit card number we can determine who the issuer/vendor is with a few basic knowns.
Complete the function getIssuer() that …
Find Count of Most Frequent Item in an Array in Java
The challenge
Complete the function to find the count of the most frequent item of an array. You can assume that input is an array of integers. For an …
Read Article →Return Nth Smallest Element in Java
The challenge
Given an array/list [] of integers, Find the Nth smallest element in this array of integers
- Array/list size is at least 3 . …