Questions tagged [number]
This challenge is intended to be solved by using, manipulating, accepting as input, or outputting numeric values.
1,067
questions
16
votes
22answers
3k views
Size Does Matter (at least referring to bottles)
Introduction
I have an even number of bottles, all of different sizes. Unfortunately, I only know the size of the smallest bottle: 300ml.
I also know the following:
Half of the bottles are twice ...
-5
votes
2answers
207 views
Fastest N times Hello World (Java/C/ C++) [closed]
Not a new one:
Input
N, being n, 0 ≤ n ≤ 5.
Output
N times "Hello World."
Example:
Input
3
Output
Hello World.
Hello World.
Hello World.
These 2 are my ...
9
votes
23answers
2k views
Max of the reversed of two numbers
Given two real numbers (postive or negative) in the limits of float pointing number data types, i.e., (\$-3.4e38\$ to \$3.4e38\$) not inclusive, you should output the max of the two reversed numbers.
...
13
votes
6answers
404 views
Roman Numeral Counting
Roman numerals can be (mostly) written in a one column format, because each letter intersects the top and the bottom of the line. For example: I, or 1 intersects ...
13
votes
10answers
680 views
Reach the number in minimum steps
In this challenge, you are given a number x. You have to find the minimum number of steps required to reach x from 1. At a particular point, you have two choices:
1) Increment the number by 1.
2) ...
35
votes
10answers
3k views
Interpret numbers very literally
To interpret a positive integer very literally, write it in English words (without "and"), replace hyphens with spaces, replace each resulting word with its number value, and concatenate the results ...
12
votes
8answers
440 views
Output integer given a digital clock style input
Input
_ _ _ _ _ _ _ _
| _| _||_||_ |_ ||_||_|| |
||_ _| | _||_| ||_| _||_|
output
1234567890
Rules
...
14
votes
4answers
471 views
List where pinballs would exit a grid of bumpers from different entrance points
Inspired by this lumosity mini game, Pinball Recall
We start with a rectangular grid (viewed from above) with several bumpers as follows. Entrances/exits are numbered counter-clockwise starting from ...
24
votes
14answers
3k views
Are my triangles similar?
Given (in any structure; flat list, two lists of lists, a tuple of matrices, a 3D array, complex numbers,…) the coordinates for two non-degenerate triangles ...
15
votes
10answers
1k views
Digit Date Range
NOTE: Since I'm Dutch myself, all dates are in the Dutch dd-MM-yyyy format in the challenge description and test cases.
Challenge:
Inputs:
Start date \$s\$; End ...
4
votes
7answers
158 views
Replace by most recent nonzero [duplicate]
Given a non-empty list of decimal digits (0, 1, ..., 9), replace each zero by the most ...
42
votes
30answers
8k views
French license plates
Sandbox
French License Plates
French license plates come in a sequential order, following a specific pattern of numbers and letters : AB-012-CD
Challenge
Write ...
24
votes
18answers
3k views
Calculate the Ultraradical
What is the Ultraradical
The ultraradical, or the Bring radical, of a real number \$a\$ is defined as the only real root of the quintic equation \$x^5+x+a=0\$.
Here we use \$UR(\cdot)\$ to denote ...
19
votes
26answers
3k views
Convert a string of digits from words to an integer
Convert a string containing digits as words into an integer, ignoring leading zeros.
Examples
"four two" -> 42.
...
2
votes
9answers
232 views
Given a sequence of numbers, print out all possible sets such that the sum is less than a number
The problem has 3 inputs.
L: a list of all numbers
size: the size each set can be
max: the max sum amongst each set
The challenge is as follows:
Given L, size and max, construct as many sets from ...
24
votes
20answers
7k views
1, 2, 4, 8, 16, … 33?
Challenge
Write a function/program that outputs either the n'th element, or the first n elements, in the well known number ...
36
votes
50answers
7k views
I reverse the source code, you negate the input!
Blatant rip-off of a rip-off. Go upvote those!
Your task, if you wish to accept it, is to write a program/function that outputs/returns its integer input/argument. The tricky part is that if I ...
15
votes
7answers
1k views
Decimal “XOR” operator
Many programming language provide operators for manipulating the binary (base-2) digits of integers. Here is one way to generalize these operators to other bases:
Let x and y be single-digit numbers ...
13
votes
11answers
761 views
Output Distinct Factor Cuboids
Output Distinct Factor Cuboids
Today's task is very simple: given a positive integer, output a representative of each cuboid formable by its factors.
Explanations
A cuboid's volume is the product ...
14
votes
16answers
2k views
What's this constructed number's starter?
A number of programming languages construct large integers through 'concatenating' the digit to the end of the existing number. For example, Labyrinth, or Adapt. By concatenating the digit to the end, ...
24
votes
31answers
4k views
Round away from zero
Round away from zero
Inspired by Round towards zero.
Given a number input via any reasonable method, round the number "away from zero" - positive numbers round up, and negative numbers round down.
...
41
votes
17answers
6k views
First Number to Contain Each Letter
Given a single letter from A to Z (except J and K) as input, output the smallest non-negative integer containing that letter in its written form. Assume numbers never contain the word "and", so ...
16
votes
12answers
5k views
Divide Numbers by 0
We've all been told at some point in our lives that dividing by 0 is impossible. And for the most part, that statement is true. But what if there was a way to perform the forbidden operation? Welcome ...
14
votes
59answers
3k views
Round towards zero
This is a simple task. Given a positive or negative real number, round it to the next whole integer closer to zero.
The challenge
Take input through any reasonable form (stdin, function, etc.) of ...
20
votes
9answers
2k views
Levenshtein Neighbours
Most square numbers have at least 1 different square number with which their Levenshtein distance is exactly 1. For a given square \$x\$, each square that meets this condition is called a Levenshtein ...
15
votes
18answers
2k views
Simplification of numbers
How, you can’t remember the 6 or 7-digit phone number that appeared on the TV screen for a second?! Using the special technique described below, you will turn into a walking phonebook!
Obviously, the ...
8
votes
6answers
939 views
Determine Beckett Grading Service (BGS) Final Grade
Introduction:
Beckett Grading Service (aka BGS), is a company which encapusulates and grades Trading Card Game (TCG) cards (i.e. sport cards, Magic The Gathering, Pokémon, Yu-Gi-Oh, etc. etc.). The ...
9
votes
17answers
1k views
Alphanumeric Line and Curve Counting
Given an input string, write a program that outputs the total number of lines and curves it has.
The Challenge
Take input from STDIN, or any other input method.
...
-4
votes
4answers
105 views
One square root function for unsigned numbers [closed]
One square root function for unsigned numbers
Write the function sqrti(x) that from one not negative integer number x, it returns the integer square root of that number truncate to the 0 digit, so ...
25
votes
54answers
6k views
Integer Lists of Noah
Introduction:
I think we've all heard of it, but here a very brief summary: Noah gathered two of every species of animal on the planet, male and female, to save in his Ark during a great flood. The ...
7
votes
17answers
1k views
Tesco's Burger Relish Best Before End date number
Given a date between 2010-01-01 and 2099-12-31 as three integers (please state your order if not [year,month,day]), answer with Tesco's corresponding five-digit ...
-6
votes
4answers
192 views
Is this number a palindrome? [closed]
Input
A single integer in your language's preferred format. This format is non-negotiable (no input as strings, arrays of digits, etc.), but standard I/O formats do apply if otherwise it would be ...
37
votes
31answers
14k views
Do the 26 richest billionaires own as much wealth as the poorest 3.8 billion people?
Introduction:
A few days ago I read this post with the same title when I came across it in the HNQ. In this question it is being discussed if the claim of president-candidate Bernie Sanders, who ...
12
votes
3answers
469 views
Implement a strongly Darboux function
According to Wikipedia, a strongly Darboux function is
one for which the image of every (non-empty) open interval is the whole real line
In other words, a function \$f\$ is strongly Darboux if ...
23
votes
19answers
3k views
Analog is Obtuse!
An analog clock has 2 hands*: Hour and minute.
These hands circle the clock's face as time goes by. Each full rotation of the minute hand results in 1/12th of a rotation of the hour hand. 2 full ...
5
votes
0answers
180 views
Fastest way to iterate over sublattice of discrete lattice
I need to construct a functor that iterates over the linear representation of a sub-lattice of size \$d_x,d_y,d_z,d_q\$ embedded in a lattice of size \$n_x,n_y,n_z,n_q\$. The sub-lattice corner is ...
13
votes
4answers
441 views
Distributing parliament seats
Introduction
In a general election, one would like to calculate a constant price per parliament seat. This means that for N >= 0 seats to be distributed and a ...
21
votes
6answers
983 views
Subtract the Folded Matrix
Challenge:
Given an NxN matrix where \$N\geq2\$ and one of eight distinct 'folding options', output a 2D array/list with the subtracted values.
The eight folding options are: left-to-right; right-to-...
12
votes
7answers
392 views
Print the total length of all “quoted” characters
Rules
In this challenge, I'm going to redefine the definition of "quotes" a bit.
Quotation marks (AKA quotes) are any identical characters used in pairs in various writing systems to set off direct ...
11
votes
6answers
912 views
Group Integers by Originality
Introduction:
I collect twisty puzzles. Most twisty puzzles are produced and sold by Chinese companies. Most well-known companies ask permission from puzzle designers to produce their designs and ...
14
votes
31answers
2k views
Incremental Ranges!
Your task is to, given two positive integers, \$x\$ and \$n\$, return the first \$x\$ numbers in the incremental ranges sequence.
The incremental range sequence first generates a range from one to \$...
20
votes
22answers
2k views
Rotated Position of Integers
Challenge:
Input:
A sorted list of positive integers.
Output:
The amount of integers which are still at the exact same index, after rotating the digits in each integer its index amount of times ...
8
votes
4answers
610 views
Leading and Suffering Numbers
Introduction:
In Dutch, the words leading and suffering, being 'leiden' and 'lijden' respectively, are pronounced the same way. One is written with a "short ei", and one with a "long ij", as we ...
34
votes
18answers
2k views
Count rotary dial pulses in a phone number (including letters)
In your grandparents' day, dialing a phone number was done with a rotary dial like this:
To dial each digit, put your finger in the corresponding hole, pull it over to the finger stop, and release it....
18
votes
22answers
2k views
To exponential digit growth and beyond!
Challenge
Given a base \$1 < b < 10\$ and an index \$t \ge 1\$, output term \$x_t\$, defined as follows:
\$x_1 = 11_{10}\$
\$x_{i+1}\$ is obtained by converting \$x_i\$ to base \$b\$ and then ...
-3
votes
11answers
304 views
Convert a number into “bracket” numerals
"Bracket" numerals are a type of 'numerals' I made up once, and thought would be a nice challenge here. Basically, you convert the input number into base 6, and then transliterate the ...
18
votes
15answers
2k views
Divisor Rich and Poor Numbers
Introduction
In the strange world of integer numbers, divisors are like assets and
they use to call "rich" the numbers having more divisors than their reversal, while they call "poor" the ones having ...
20
votes
16answers
3k views
Cuban Primes
Given a natural number \$n\$, return the \$n\$-th cuban prime.
Cuban Primes
A cuban prime is a prime number of the form
$$p = \frac{x^3-y^3}{x-y}$$
where \$y>0\$ and \$x = 1+y\$ or \$x = 2+y\$
...
13
votes
12answers
404 views
Find all \$k\$-smooth pairs
Introduction
In number theory, we say a number is \$k\$-smooth when its prime factors are all at most \$k\$. For example, 2940 is 7-smooth because \$2940=2^2\cdot3\cdot5\cdot7^2\$.
Here, we define a ...
30
votes
19answers
5k views
Is it a Munchausen Number?
A Munchausen Number in base \$b\$, also known as a Perfect digit-to-digit invariant or PDDI is a peculiar type of positive integer where the sum of its base-\$b\$ digits raised to themselves is equal ...
