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# LY Cao

2,125 total contributions since 2011

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This problem is designed to test your luck, and therefore the contents of your function are irrelevant. In order to do so, the t...

2 years ago

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Just take it easy for a second or two!
Your code needs to take 'exactly' one second or 'exactly' two seconds to run (depending on the input) — accurate to ±0.5 millise...

2 years ago

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Wait a second!
Your code needs to take 'exactly' one second to run — accurate to ±0.5 milliseconds. The input will be the number of millis...

2 years ago

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Tautology
Check if the given expression is always true. For example, the sentence '~(A & B) == (~A | ~B)' is always true. Chara...

2 years ago

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Shorten pathname
Given a pathname string, return a condensed version by replacing intermediate folders with '..'. *Example* If fullpat...

2 years ago

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Big data
Optimize this line of code: B = sum(gradient(corrcoef(A)).^2); for a matrix A with size(A,2)>>size(A,1) *Description:...

2 years ago

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One track five lanes
Find the minimum number of lane changes necessary to cross the entire track without running into any obstacles <<http://www.a...

2 years ago

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Five steps to enlightenment
This problem asks you to identify valid variations of the famous <https://en.wikipedia.org/wiki/Sum_and_Product_Puzzle sum and p...

2 years ago

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The sliding puzzle: 3D
This is an extension of <https://www.mathworks.com/matlabcentral/cody/problems/42842 problem 42842>. In this case, the puzzle is...

2 years ago

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Five-dimensional maze
*Description* The traditional maze is 2-dimensional: the navigator can move in the positive or negative directions along two ...

2 years ago

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Pandigital Multiples of 11 (based on Project Euler 491)
A "Pandigital number of order X" is one that contains all of the numbers from 0 to X, but with no leading zeroes. If X>9, the c...

2 years ago

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Inscribed Pentagon? 2
Your function will be provided with the five vertices of a pentagon (p) as well as the center point (cp) and radius (r) of a cir...

2 years ago

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Ned's Queens
A tribute to Cody's five-year anniversary should also celebrate the people behind Cody, and in this particular case, our illustr...

2 years ago

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Recaman Sequence - III
I want to create a Recaman sequence where the nth number will be 1. So from which integer should I start the Recaman sequence? ...

2 years ago

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Circumscribed Pentagon?
Building off of <https://www.mathworks.com/matlabcentral/cody/problems/44368 Problem 44368>, your function will be provided with...

2 years ago

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Hexagonal numbers on a spiral matrix
Put hexagonal numbers in a ( m x m ) spiral matrix and return the sum of its diagonal elements. Formula of hexagonal numbers ...

2 years ago

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Birthday cake
It's Cody's 5th birthday, and you've been tasked with putting the candles on the cake. Your goal is to maximize the distance bet...

2 years ago

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Cache me Outside
The test suite includes a simple recursive Fibonacci sequence generator, but it's terribly inefficient. One simple method for im...

2 years ago

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Is this a valid Tic Tac Toe State?
For the game of <https://en.wikipedia.org/wiki/Tic-tac-toe Tic Tac Toe> we will be storing the state of the game in a matrix M. ...

2 years ago

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Pair Primes
Let's define pair primes as follow; * *For 2 digits numbers:* 11 and 17 are pair primes because both of them are 2 digits pri...

2 years ago

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Digit concentration in Champernowne's constant
Consider the first 50 digits of Champernowne's constant 0.12345678910111213141516171819202122232425262728293... The...

2 years ago

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"Cody" * 5 == "CodyCodyCodyCodyCody"
*Alice*: What? *"Cody" * 5 == "CodyCodyCodyCodyCody"*? You've gotta be kidding me! *Bob*: No, I am serious! Python supports...

2 years ago

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Group-wise Euclidean distance
*Input*: * *x* —— An array of size *n-by-d*, where each row vector denotes a point in a d-dimensional space; * *g* —— A gro...

2 years ago

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An asteroid and a spacecraft
&#128640 Imagine a non-relativistic simple situation. Assume positions p0, p1, p2, and p3 are three dimensional Cartesian ...

2 years ago

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Sums of Distinct Powers
You will be given three numbers: base, nstart, and nend. Write a MATLAB script that will compute the sum of a sequence of both ...

2 years ago

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5th Time's a Charm
Write a function that will return the input value. However, your function must fail the first four times, only functioning prope...

2 years ago

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Pi Digit Probability
Assume that the next digit of pi constant is determined by the historical digit distribution. What is the probability of next di...

2 years ago

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Parse me a Lisp
*Description* In Lisp and its variants, function calls are done using parenthesis where the first item in the parenthesis is ...

2 years ago

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Acid and water
&#9878; &#9878; &#9878; &#9878; &#9878; &#9878; &#9878; &#9878; Assume that there is a 100 liter tank. It is initially fi...

2 years ago

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Number of Even Elements in Fibonacci Sequence
Find how many even fibonacci numbers are available in the first d numbers. Consider the following first 14 numbers 1 1 2...

2 years ago