Problem 39. Which values occur exactly three times?

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Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if

 x = [1 2 5 2 2 7 8 3 3 1 3 8 8 8]

then

 y = [2 3]

Solve

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Last Solution submitted on Feb 06, 2025

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Luyu Wang on 10 Jul 2018

the in-build function tabulate cannot used in here.

Mitchell on 27 Nov 2023

I never thought I could use this line of code for this problem but what do you know

Long Runjia Yu on 11 Feb 2024

i have used a loop construct for this but apparently there are far faster ways (length: 20ish instead of 80-100)

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Problem 39. Which values occur exactly three times?

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Primes and Rough Numbers, Basic ideas

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Problem 39. Which values occur exactly three times?

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Last 200 Solutions

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Primes and Rough Numbers, Basic ideas

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