Solve the Number of Recent Calls Challenge in Java
The challenge
You have a RecentCounter class which counts the number of recent requests within a certain time frame.
Implement the RecentCounter …
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Calculate the Summation of a Number in Java
The challenge
Write a program that finds the summation of every number from 1 to num. The number will always be a positive integer greater than 0.
For …
Read Article →How to Calculate all Unique Combinations of a Target using Backtracking in Java
The challenge
Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where …
Who is going to pay for the wall? in Python
The challenge
Don Drumphet lives in a nice neighborhood, but one of his neighbors has started to let his house go. Don Drumphet wants to build a wall …
Read Article →Calculate the Total Amount of Points using Java
The challenge
Our football team finished the championship. The result of each match look like “x:y”. Results of all matches are recorded …
Read Article →Calculate the biggest of 3 numbers using Java
The challenge
Task
- Given three integers
a,b,c, return the largest number obtained after inserting the following operators and brackets:+,*,() - In …
Find the missing element between two arrays in Python
The challenge
Given two integer arrays where the second array is a shuffled duplicate of the first array with one element missing, find the missing …
Read Article →How to Count an Array of Boolean Values in Java
The challenge
Consider an array/list of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep …
Read Article →How to Solve the Car Pooling Challenge in Java
The challenge
You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only drives east (ie. it cannot …
How to Repeat a String in Java
The challenge
Write a function called repeat_str which repeats the given string src exactly count times.
repeatStr(6, "I") // "IIIIII" …How to Find the Smallest Integer in the Array in Java
The challenge
Given an array of integers your solution should find the smallest integer.
For example:
- Given
[34, 15, 88, 2]your solution will return …
How to Count Odd Numbers Below N using Java
The challenge
Given a number n, return the number of positive odd numbers below n, EASY!
oddCount(7) //=> 3, i.e [1, 3, 5]
oddCount(15) //=> 7, …