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 a permutation of integers in range 1:n, return it's index following above pattern.

See also: 42495

Solve

Solution Stats

75 Solutions

35 Solvers

Last Solution submitted on Feb 08, 2026

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers35

George Berken Augusto Mazzei GeeTwo Hoang Minh Tri

Suggested Problems

More from this Author40

Problem Tags

Community Treasure Hunt

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

Start Hunting!