Problem 109. Check if sorted

Created by AMITAVA BISWAS

Solve Later

Check if sorted.

Example:

 Input  x = [1 2 0]
 Output y is 0

Solve

Solution Stats

7289 Solutions
3722 Solvers

Last Solution submitted on Apr 05, 2020

Last 200 Solutions

Problem Comments

10 Comments

10 Comments

Show 7 older comments

Vivek on 30 May 2013

Sort means ascending or descending or both? Not clear

Geoffrey Akien on 7 Jul 2013

I agree! The code is significantly different for those possible cases.

Pascal Geschwill on 7 Jan 2014

Unfortunately, way too easy!

Matt Wolinsky on 10 Sep 2014

I agree it's not clear ... but
y = ~var(nonzeros(sign(diff(x))));
works for both ascending/descending cases.
(The test suite clarifies that ascending is the intended case)

Wang Yunhe on 16 Mar 2015

y = ~var(nonzeros(sign(diff(x)))); amazing~ ！nice idea

Sam Marshalik on 22 Jan 2016

There is a sort array command in MATLAB.

Muhammad M Sahari on 20 Dec 2016

if you are not familiar with array, will be difficult

Gan Wee Ting on 20 Dec 2016

nice

Jack Knoll on 6 Apr 2017

hehe

Georgios Stoumpis on 13 Jun 2017

The solution "y = issorted(x);" with a metric of 12 is not the leading solution. "Fair Play" is something unknown to cheaters!

Solution Comments

Solution 1185914

1 Comment

1 Comment

Informaton on 11 May 2017

Is it supposed to be sorted in ascending or descending order? I'll just pick randomly ...

Solution 1094297

1 Comment

1 Comment

TAYALAN SIVALINGAM on 29 Dec 2016

Solution 1028104

1 Comment

1 Comment

David Verrelli on 3 Sep 2018

This user (mohamed elbesealy) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV

Solution 932479

1 Comment

1 Comment

Oliver Penn on 6 Aug 2016

Similar to monotonically increasing problem.

Solution 788198

1 Comment

1 Comment

Alexey Sinitsin on 4 Dec 2015

That was hard

Solution 358715

1 Comment

1 Comment

Marcel on 24 Nov 2013

thank you Emilio

Solution 355411

1 Comment

1 Comment

Emilio on 19 Nov 2013

haha

Solution 327348

1 Comment

1 Comment

Shuo on 2 Oct 2013

Additional sort command takes extra node...

Solution 103932

2 Comments

2 Comments

Norbert Marwan on 2 Sep 2016

The leading solution (solution 103932) is wrong and doesn't work. The error is that the output argument "ans" is not assigned.

Jan Orwat on 2 Sep 2016

@Norbert, this trick worked in Cody before, now it doesn't. I wrote trick, cause it was a way to have a little bit lower Cody size. It was questioned why it's not banned, because it favours bad programming practices, so changes were made.

Solution 59623

2 Comments

2 Comments

Viktor on 11 Mar 2012

Hard one :)

Frequency Domain on 23 Jul 2013

facepalm

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basic matlab sort

Problem 109. Check if sorted

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Last 200 Solutions

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Problem 109. Check if sorted

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Last 200 Solutions

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Problem Recent Solvers3722

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