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Challenges related to elementary arithmetic.

10 votes
3 answers
502 views

Verify the birth number

A Norwegian Birth Number consists of 11 digits, composed the following way: DDMMYYiiikk DD is the day (from 01-31) MM is the month (from 01-12) YY is the year (from 00-99). It's not differentiated …
Stewie Griffin's user avatar
13 votes
7 answers
612 views

Find the optimal sliding door width

Sliding doors have varying prices based on the width of the doors. The different prices are as follows: 60 - 80 cm: ¤150 81 - 100 cm: ¤200 101 - 120 cm: ¤220 When buying a closet you would obvi …
Stewie Griffin's user avatar
9 votes
2 answers
333 views

Solve a mathematical expression from alternating sides

Create a program that solves a mathematical expression using the elements from alternating sides of the expression. The way it’s done is, instead of reading from left to right, you read the first char …
Stewie Griffin's user avatar
22 votes
14 answers
2k views

Calculate the bounded cumulative sum of a vector

The cumulative sum of a vector is calculated by simply taking the sum of all previous elements. For instance: vec = [1 1 1 -1 -1 -1 -1 -1 1 1 1 1 -1] cum_vec = [1 2 3 2 1 0 -1 -2 -1 0 …
Stewie Griffin's user avatar
21 votes
11 answers
845 views

Sort a concatenated sequence

Consider a sequence based on recurrence relations, f(n) = f(n-1)+f(n-2), starting with f(1) = x1, f(2) = x2. For x1 = 2, x2 = 1, the sequence begins like this: 2 1 3 4 7 11 18 29 47 76 123 …
Stewie Griffin's user avatar
23 votes
5 answers
1k views

Write a Morse Calculator

Write a program or function that takes a mathematical expression in Morse code as input, and returns the solution in Morse code. Valid operations are plus: + and minus: _ (underscore). You can assume …
Stewie Griffin's user avatar
13 votes
6 answers
538 views

The unique multiplication spiral

This one is inspired by Calvin's Hobbies recent multiplication table challenge. Write a function or program that takes an integer N as input and prints or returns a N-by-N unique multiplication spira …
Stewie Griffin's user avatar
18 votes
12 answers
2k views

Calculate the volume of an object

You can determine the volume of objects based on a given set of dimensions: The volume of a sphere can be determined using a single number, the radius (r) The volume of a cylinder can be determined …
Stewie Griffin's user avatar
9 votes
6 answers
1k views

Calculate the Kronecker sum of two matrices

In the examples below, A and B will be 2-by-2 matrices, and the matrices are one-indexed. A Kronecker product has the following properties: A⊗B = A(1,1)*B A(1,2)*B A(2,1)*B A(2,2)*B …
Stewie Griffin's user avatar
29 votes
6 answers
4k views

1+1 = 10, 1+2 = 3

Write a function or program than can do simple arithmetic (addition, subtraction, multiplication and division) in both base 10 and base 2. …
Stewie Griffin's user avatar
32 votes
21 answers
3k views

How much present did you get for Christmas?

Yes, how much, not how many... As we all know, a large present is far better than a small one. Therefore, the value of the presents should always be measured in total volume, not number of presents, …
Stewie Griffin's user avatar
38 votes
14 answers
6k views

The sum is always 15

Write a program or function that takes an array of non-negative integers as input and outputs a set of vectors/arrays with the elements of the input array in order, split so that each vector sums up t …
Stewie Griffin's user avatar
19 votes
2 answers
882 views

Dames, do some math!

The order of operations, PEMDAS, is a basic rule in mathematics telling us which order operations should be performed: "Parentheses, Exponents, Multiplication and Division, and Addition and Subtracti …
Stewie Griffin's user avatar