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Compute Fibonacci Number

Compute the _n_-th Fibonacci Number f(0) = 0, f(1) = 1, f(2) = 1, f(3) = 2, ... f(42) = 267914296

5 years ago

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Polite numbers. Politeness.

A polite number is an integer that sums of two or more consecutive positive integers. Politeness of a positive integer is a num...

5 years ago

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Narcissistic number ?

Inspired by Problem 2056 created by Ted. In recreational number theory, a narcissistic number is a number that is the sum of ...

5 years ago

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Determine if a Given Number is a Triangle Number

*Description:* Determine if the elements of an input array are triangle numbers and return the result as an array with the sa...

5 years ago

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Triangle sequence

A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

5 years ago

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Side of an equilateral triangle

If an equilateral triangle has area A, then what is the length of each of its sides, x? <<http://upload.wikimedia.org/wikipe...

5 years ago

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Side of a rhombus

If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<http://upload.wikimedia.org/wikipe...

5 years ago

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Find a Pythagorean triple

Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

5 years ago

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Can't wait for NewYear ball drop !

Given an input string of the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', return a string message indicating how many days, hours...

5 years ago

Problem

Can't wait for NewYear ball drop !

Given an input string of the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', return a string message indicating how many days, hours...

5 years ago | 1 | 23 solvers

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Days until next NewYear ball drop

Given a date string in the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', calculate the number of *days* until the dropping of the ...

5 years ago

Problem

Days until next NewYear ball drop

Given a date string in the form 'yyyy-mm-dd' or 'yyyy-mm-dd hh:mm:ss', calculate the number of *days* until the dropping of the ...

5 years ago | 1 | 25 solvers

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Back to basics 6 - Column Vector

Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector, output true or false whether it is a colu...

5 years ago

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Find the sum of the elements in the "second" diagonal

Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.

5 years ago

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Sum of diagonal of a square matrix

If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12

5 years ago

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Area of an Isoceles Triangle

An isosceles triangle has equal sides of length x and a base of length y. Find the area, A, of the triangle. <<http://upload...

5 years ago

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Area of an equilateral triangle

Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

5 years ago

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Length of the hypotenuse

Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<http://upload....

5 years ago

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Is this triangle right-angled?

Given any three positive numbers a, b, c, return true if the triangle with sides a, b and c is right-angled. Otherwise, return f...

5 years ago

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Length of a short side

Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

5 years ago

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Dimensions of a rectangle

The longer side of a rectangle is three times the length of the shorter side. If the length of the diagonal is x, find the width...

5 years ago

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Which doors are open?

There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

5 years ago

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Tell me the slope

Tell me the slope, given a vector with horizontal run first and vertical rise next. Example input: x = [10 2];

5 years ago

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Is this triangle right-angled?

Given three positive numbers a, b, c, where c is the largest number, return *true* if the triangle with sides a, b and c is righ...

5 years ago

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Solve the Sudoku Row

*Description* A simple yet tedious task occurs near the end of most Sudoku-solving algorithms, computerized or manual. The ta...

5 years ago

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Multielement indexing of a row array

The row array birthRateChina stores the China birth rate (per 1000 people) for years 2000 to 2012. Write a statement that create...

5 years ago

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Quote Doubler

Given a string s1, find all occurrences of the single quote character and replace them with two occurrences of the single quote ...

5 years ago

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Average valid values of arrays

Given a 1D array (column or row vector), compute the average of valid values. Valid values are defined via two thresholds: minVa...

5 years ago

Problem

Average valid values of arrays

Given a 1D array (column or row vector), compute the average of valid values. Valid values are defined via two thresholds: minVa...

5 years ago | 0 | 35 solvers

Solved

Elapsed Time

Given two date strings d1 and d2 of the form yyyy/mm/dd HH:MM:SS (assume hours HH is in 24 hour mode), determine how much time, ...

5 years ago