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Problem 793. Combinations without using nchoosek

Created by Aurelien Queffurust

You have to generate a matrix with all possible combinations of n elements taken 2 at a time, without using nchoosek(1:n,2) :

Examples

if n = 3

output =

       1     2
       1     3
       2     3

if n = 5

output = 
       1     2
       1     3
       1     4
       1     5
       2     3
       2     4
       2     5
       3     4
       3     5
       4     5

Good luck!!

Problem Group

Solution Statistics

37 correct solutions 17 incorrect solutions
Last solution submitted on Apr 18, 2016

Solution Comments