Problem 42495. N-th permutation.

Let write some permutations of positive integers.

    1:    1 2 3 4 5 6 ...
    2:    2 1 3 4 ...
    3:    1 3 2 4 ...
    4:    2 3 1 4 ...
    5:    3 1 2 4 ...
    6:    3 2 1 4 ...
   25:    1 2 3 5 4 ...
  120:    5 4 3 2 1 6 7 ...

Given an index, find appropriate permutation and truncate sorted part on the right side.

example:

323:    3 5 1 6 4 2 7 8 9 10 ...
>> n = 323;
>> whichperm(n)
ans = 
       3 5 1 6 4   

See also: 42494

Solution Stats

50.0% Correct | 50.0% Incorrect
Last Solution submitted on Jul 24, 2023

Problem Comments

Solution Comments

Show comments


Problem Recent Solvers32

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!