Gelöst

Return a list sorted by number of occurrences
Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x. Ties are resolved by a ...

etwa 5 Jahre vor

Gelöst

Encode Roman Numerals
Create a function taking a non-negative integer as its parameter and returning a string containing the Roman Numeral representat...

etwa 5 Jahre vor

Gelöst

Roman numbers: how old is that building?
The front of old buildings sometimes show the year when they were built in roman numbers. These number are rather confusing and ...

etwa 5 Jahre vor

Gelöst

Find the logic
There exists one logic in between input and output. Find it (easy math). Example 1: x=13 then y=339; Example 2: x=26...

etwa 5 Jahre vor

Gelöst

Bit calculation
Give me the count of numbers from 1 to n having their last two bits as 0. For example function y = ret_count(4) y = x...

etwa 5 Jahre vor

Gelöst

Compute the sum of reciprocals of quadratics
Write a function to compute the following sum: See also Cody Problem 46000.

etwa 5 Jahre vor

Gelöst

Rock Paper Scissors Lizard Spock

etwa 5 Jahre vor

Gelöst

Pick the die most likely to win
After discussing Rock, Paper, Scissors, Lizard, Spock in The Simpsons and their Mathematical Secrets, Simon Singh writes that in...

etwa 5 Jahre vor

Gelöst

Matrix convolution
A certain convolution step involves an elementwise multipication between two 3x3 matrices and taking the resulting sum of the el...

etwa 5 Jahre vor

Gelöst

All flights lead to Idaho Falls
Using spherical trigonometry and great circle paths, determine the distance (in kilometers) and the initial flight heading (from...

etwa 5 Jahre vor

Gelöst

Compute the effective conductivity of a heterogeneous aquifer
Slow flow through soil or another porous medium follows Darcy’s law, which relates the flow of water to the gradient in piezome...

etwa 5 Jahre vor

Gelöst

Compute a sum involving the totient over divisors of a number
Write a function to compute the following sum: where is the totient function. The sum is computed over the divisors of (inc...

etwa 5 Jahre vor

Gelöst

Nuclear Binding Energy
Compute the approximate nuclear binding energy in MeV using the least-squares fit of the semi-emirical mass formula. Round to th...

etwa 5 Jahre vor

Gelöst

Count numbers whose reciprocals' decimal expansions terminate

etwa 5 Jahre vor

Gelöst

List Proth primes

etwa 5 Jahre vor

Gelöst

Median computation (★★★)
See easy edition of this problem. However, now you must compute the median of any real-valued vector without using the in-built...

etwa 5 Jahre vor

Gelöst

Approximate functions 2 (★★★★)

etwa 5 Jahre vor

Gelöst

Eliminate redundant numbers in text
Occasionally someone might write text such as Briefly explain one (1) common problem that can result from the constant use of ...

etwa 5 Jahre vor

Gelöst

Identify Ruth-Aaron numbers
After Hank Aaron hit his 715th home run and passed Babe Ruth’s total of 714, Carl Pomerance noticed that the union of the prime ...

etwa 5 Jahre vor

Gelöst

Uranium–Lead Dating

etwa 5 Jahre vor

Gelöst

Solve an ODE: equation C
Write a function to solve the following ordinary differential equation: with and . The parameter is a constant. The functi...

etwa 5 Jahre vor

Gelöst

Count unique orderings of vertices of a polygon
Cody Problem 2671 asks us to determine whether four points can be the corners of a rectangle. The points are not necessarily inp...

etwa 5 Jahre vor

Gelöst

Compute a sum of Ramanujan
Srinivasa Ramanujan defined the following function: Write a function to compute for various values of . See also Cody Proble...

etwa 5 Jahre vor

Gelöst

Compute the harmonic numbers
The nth <https://mathworld.wolfram.com/HarmonicNumber.html harmonic number> is defined as the sum of the reciprocals of the inte...

etwa 5 Jahre vor

Gelöst

Find the smallest integer m such that n divides m!
Write a function that takes an integer and finds the smallest integer whose factorial is divisible by . For example, if , then...

etwa 5 Jahre vor

Gelöst

Reverse Boggle
*Description* In the classic Parker Brothers game <http://en.wikipedia.org/wiki/Boggle Boggle>, players find words from a 4x4...

etwa 5 Jahre vor

Gelöst

Determine when snow started
R.P. Agnew posed the following problem: It starts snowing in the morning and continues steadily throughout the day. A snowplow t...

etwa 5 Jahre vor

Gelöst

Code breaker, Part II: Operation Orthos
You have been tasked with decoding several batches of coded messages that have been intercepted. Based on previous intellig...

etwa 5 Jahre vor

Gelöst

Code breaker, Part I: Operation Phoenix
You have been tasked with decoding a set of coded messages that have been intercepted. Based on previous intelligence that ...

etwa 5 Jahre vor

Gelöst

Implement a ROT13 cipher
Replace each character in string s1 with the character that is shifted 13 positions from it (wrap back to the beginning if neces...

etwa 5 Jahre vor