# ChrisR

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I teach courses in water resources and environmental fluid mechanics.

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Problem

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...

2 days ago | 1 | 3 solvers

Solved

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...

3 days ago

Solved

What is the current time in Darwin, Australia?

Traders need to track exchange calendars and trading hours in detail, and account for time zone differences and daylight savings...

4 days ago

Solved

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...

5 days ago

Problem

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...

5 days ago | 1 | 3 solvers

Problem

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...

6 days ago | 0 | 5 solvers

Solved

Family Savings Analysis

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

7 days ago

Problem

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...

8 days ago | 1 | 4 solvers

Problem

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...

9 days ago | 0 | 4 solvers

Solved

Determine the potential energy in a springrope which hangs over from a bridge

The task is to figure out the energy a person with mass has when hung on a rope over a bridge when given the length from the sus...

11 days ago

Solved

Area of right triangle

Given a hypotenuse and a leg , calculate the area of right triangle.

11 days ago

Solved

Hofstadter Female and Male sequences

The Hofstadter Female (F) and Male (M) sequences are defined as follows Write a function to compute for a given n. See http...

12 days ago

Problem

Travel a path

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

12 days ago | 0 | 4 solvers

Solved

Instructions Following

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

13 days ago

Problem

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...

13 days ago | 0 | 6 solvers

Problem

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 ...

13 days ago | 1 | 6 solvers

Solved

Spreadsheet Column Number

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

14 days ago

Solved

snake_case to CamelCase convention

The snake_case naming convention writes words in lowercase and separates them with underscores. In CamelCase convention, the fir...

14 days ago

Solved

CamelCase to snake_case convention

The CamelCase naming convention capitalizes the first letter of each word. In snake_case convention, words are written in lowerc...

14 days ago

Solved

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 ...

14 days ago

Solved

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 ...

14 days ago

Solved

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...

14 days ago

Solved

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...

14 days ago

Solved

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...

14 days ago