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Compute a sequence with the whyphi sieve
A few problems on Cody involve sieving. For example, Cody Problem 45367 involves the famous Sieve of Eratosthenes. CP 50811uses ...

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Compute the area of a Q
A figure resembling a Q (as in “quadrature”) is constructed in the following way: A right triangle is drawn with the left vertex...

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List the smallest numbers with n distinct prime factors
The author of a book I am reading asked a mathematician what it feels like to be sixty. He wrote He replied, “Sixty, sandwiched...

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Find primes and integers that solve an equation
Write a function to find all primes and non-negative integers that solve the equation where is an integer. If there are no...

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Determine whether a property description closes
The arrival of summer makes think back to the summers I spent working for my father’s engineering firm. For the first several s...

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Classify numbers as abundant, deficient, or perfect
A number is perfect if the sum of its proper divisors (i.e., divisors excluding the number itself) is equal to itself. For examp...

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Family Savings Analysis
Given the bank accounts of individuals defined by a list of tuples containing the last name, first name, and savings: accounts ...

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Hofstadter Q sequence
The Hofstadter G sequence is defined as follows: The first elements of the sequence are 1, 1, 2, 3, 3, 4, 5, 5, 6, 6. Write ...

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Travel a path
In Cody Problem 60251, minnolina asks us to determine the end point given a string indicating unit movements forward, backward, ...

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Add non-triangular numbers
The nth triangular number is the sum of the first n positive integers. The sequence of triangular numbers starts 1, 3, 6, 10, 15...

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Compute the area of a lune
Write a function to compute the area of the shaded moon-shaped region in the figure below—that is, the area of a smaller circle ...

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Maximizing Stock Profit
As a stock exchange broker focusing on a single transaction, your goal is to maximize profit by buying a stock at a low price an...

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Minimize a quadratic function
Write a function to minimize the function . The coefficients a, b, and c will be positive. Give the coefficients in a vector coe...

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Hofstadter H sequence
The Hofstadter G sequence is defined as follows: The first elements of the sequence are 0, 1, 1, 2, 3, 4, 4, 5, 5, 6. Write ...

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Hofstadter G sequence
The Hofstadter G sequence is defined as follows: The first elements of the sequence are 0, 1, 1, 2, 3, 3, 4, 4, 5, 6. Write ...

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Stern-Brocot Sequence
The Stern-Brocot diatomic sequence is defined as follows: The first elements of the sequence are 0, 1, 1, 2, 1, 3, 2, 3, 1, 4...

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Interval Compression
Given a set of integers, the task is to create a list of closed intervals where each interval includes its endpoints. For exampl...

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Final Stone Weight
You are given an array with weights of stones. The objective is to determine the weight of the final stone remaining after all c...

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Problema

Rotate matrix 60 degrees
Given a 2*m-1 by 4*m-3 matrix in which certain elements form a hexagon of side length m, rotate the hexagon 60 degrees countercl...

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Instructions Following
Complete the function follow(s) which, for a given string (containing only the letters 'f', 'b', 'l', 'r'), calculates the final...

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Find Next Strictly Greater Element
Given an array of numbers, create a new array where each element represents the next strictly greater element to the right of th...

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Find the number of diagonals in a n sided polygon.
Find the number of diagonals in a n sided polygon.

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Finding the Most Frequent Letter in a Text
You are given a text containing various English letters, digits and punctuation symbols. Your task is to find the most frequentl...

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Spreadsheet Column Number
Spreadsheet uses an alphabetic naming system for columns, starting with 'A', 'B', 'C', etc. The column names continue like 'AB',...

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Integer Persistence, Product
Let's construct a sequence as follows: is a given natural number, and is the product of the digits of . The persistence of i...

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Perfect shuffle
We call "perfect shuffle" the process of cutting a deck of cards into two equal halves, and then perfectly interleaving them: on...

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Find the triplet
Given an array x of size n > 3 and an integer N, return the indices of three elements in the array that sum up to the given inte...

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Battery Charge Indicator
Write a function called battery_charge that visually represents the charge of a battery. The function takes an integer paramete...

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Find the largest sum of any contiguous subarray
Given an array of N integers, find the contiguous subarray (which must contain at least one number) with the maximum sum and ret...

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Remove Unique Elements
Given a list of integers, we want to keep only the non-unique elements in this list. To do this, we need to remove all the uniqu...

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