Problem 65. Word Counting and Indexing

Created by Cody Team
Appears in MATLAB Fundamentals - Programming Constructs

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You are given a list of strings, each being a list of words divided by spaces. Break the strings into words, then return a master word table of all the words and an indexed version of each string.
The master list should have no repeated entries and should be sorted in alphabetical order. The index list must be an array cell of index of each cell member corresponding to the same value in the master list. 
For Example
If str_list = {'one two three','two one four zero'}
then
word_table = {'four','one','three','two','zero'}
str_index_list = {[2 4 3],[4 2 1 5]}.
Notice that no words are repeated in word_table, and each string in the string_list can be regenerated by referencing into the word_table using the string_index_list.

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Last Solution submitted on Mar 06, 2025

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14 Comments

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Varoujan on 2 Jun 2015

Something is broken on the third test case. I think the blank line between the 2nd and 3rd line of text is what's messing it up.
I submitted a solution that works for the first two cases and outputs perfect result (including the index output) for the last case on my desktop.

Somebody at the Cody team should check their test cases.

Jan on 30 Mar 2017

There is a workaround for the broken 3rd test case:
Because of the empty line, the size of sl is 2x2 instead of 1x4. So to bring sl into proper shape, just do str_list = str_list(:)' at the beginning of your code. This will leave the input for the first two test cases unchanged.

Andrew Dobrovolc on 29 Jun 2017

Thank you Jan for the workaround for the third test case.

jo gayong on 10 Jul 2019

Test suite doesn't check whether str_index_list is correct or not. It's incomplete.

Simon Thomas on 19 Sep 2019

There seems to be no check on the word indexing part of the problem. I passed the test suite without indexing at all.

Stephan Allgeier on 17 Dec 2019

If non-vector input lists are valid inputs (test case 3), this should be stated explicitly in the problem description

Rafael S.T. Vieira on 12 Jun 2020

I know people are complaining about indexes, but the problem did not state how indexes should be created. And if there is no requirement, anything can be true.

Li Kehan Li on 17 Jun 2020

tough for me to create the right index.

Drake Madison on 19 Aug 2020

Problem has been broken for YEARS!!!! Needs to be fixed or removed!!!! word index lists are never even checked. Third test case has a bug in input.

Dyuman Joshi on 29 Aug 2021

The test suite has been modified to check the indexing cell array as well. Further modifications will be done shortly.

Piotr Balik on 3 Sep 2021

Last test is interesting! Nice brainscratcher

Marco Riani on 31 Dec 2021

I must say I do not agree with the bad comments which have been given to this test. I think it is explained properly and the tests seem to me appropriate.

arsenic 陈 on 8 Mar 2022

https://blog.csdn.net/qq_44846756/article/details/116567963

have the answer

Dianne Valera on 26 Apr 2022

enjoyed this problem!

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Problem 65. Word Counting and Indexing

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Problem 65. Word Counting and Indexing

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