# Rafael S.T. Vieira

Computer Scientist in love with Computer Graphics.

**Programming Languages:**

Python, C, Java, PHP, Javascript, MATLAB, SQL, HTML, CSS, Arduino, Shell

**Spoken Languages:**

English, French, Portuguese

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**Content Feed**

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Compute the nth Pythagorean prime

Pythagorean primes have the form p = 4n+1, where n is an integer, and they can be written as the sum of squares of two integers....

2 mesi fa

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Word Ladder

Given a set of words, and two other words - start and destination, Find the smallest chain from start to the destination such...

2 mesi fa

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Kolakoski Sequence

This is a modified version of the kolakoski sequence. Refer to the problem <https://www.mathworks.com/matlabcentral/cody/p...

2 mesi fa

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Quarantine Days

In these quarantine days, a list of what Max may do on a typical day is given in a table with the starting hour to ending hour. ...

2 mesi fa

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Sub-sequence - 03

Given three sequences, find the length of the longest common subsequence. It is similar to the previous problem -- <https...

2 mesi fa

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Sub-sequence - 02

Given two sequences, find the length of the longest common subsequence. a=[1,1,1,1,1,2,3,1,4] b=[2,3,0,0,9,5,4,1] longe...

2 mesi fa

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Sub-sequence - 01

Find the length of the longest increasing subsequence in the given array. a=[2,4,2,1,3,5,6] longest increasing subsequen...

2 mesi fa

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The Tortoise and the Hare - 02

Previous problem <https://www.mathworks.com/matlabcentral/cody/problems/45425-the-tortoise-and-the-hare-01> Suppose in an inf...

2 mesi fa

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volume of a rectangle prism

volume of a rectangle prism using "b" as base, "h" as height and "w" as width.

2 mesi fa

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Coin Distribution - 02

Prev prob <https://www.mathworks.com/matlabcentral/cody/problems/45385-coin-distribution> Given a set of coins and an amount,...

2 mesi fa

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Count the ways to draw non-intersecting chords between points on a circle

There are 9 ways to draw non-intersecting chords between four points on the perimeter of a circle (including no chords at all). ...

2 mesi fa

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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 ...

2 mesi fa

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List modest numbers up to n

After determining the nude numbers, or the numbers that openly display some of their divisors as their digits, one would think t...

2 mesi fa

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Find numbers in the Popular Computing Z-sequence

Here’s a quick one. In 1977 the magazine Popular Computing sought “problem situations for which the computer is the best (if not...

2 mesi fa

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Determine whether a number is a fibodiv number

The number 14 is a fibodiv number because you can divide it into 1 and 4, use those numbers as the seeds for a Fibonacci sequenc...

2 mesi fa

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Fill a rectangle with 1x1 and 2x2 tiles

A 3x2 rectangle can be filled with 1x1 and 2x2 tiles in three ways: The colors merely distinguish the sizes of the tiles. A 3...

2 mesi fa

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Classify product/digit-sum sequences

Cody Problem 53120 involved a sequence in which a term is computed by multiplying the previous two terms and adding the digits o...

2 mesi fa

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Compute the Sequence of the Day

A sequence starts with 1 and 2, and each subsequent term is the sum of the digits of the product of the previous two terms. As a...

2 mesi fa

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List the dopey numbers

If vile numbers have binary representations that end with an even number of zeros (even vile), then numbers with binary represe...

2 mesi fa

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List the vile numbers

Evil numbers, the subject of Cody Problem 2733 have an even number of ones in their binary representations, whereas odious numbe...

2 mesi fa

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Sum the elements in rows of the Levine triangle

The Levine triangle starts as follows: Row 0: 2 Row 1: 1 1 Row 2: 1 2 Row 3: 1 1 2 To construct each row, r...

2 mesi fa

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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...

2 mesi fa

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Find the nth nude number

The number 672 is a nude number because it openly displays three of its divisors: 6, 7, and 2. In other words, a nude number is ...

2 mesi fa

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Acid and water

⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ Assume that there is a 100 liter tank. It is initially fi...

2 mesi fa

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Easy Sequences 24: Number of Coprime Lattice Points

Given a number 'n', you were tasked to mark and count all coprime lattice points at the first quadrant bounded by the points (0,...

2 mesi fa