Try to implement permutation full search that often appears in competition pros with python

at first

I am writing an article as an output because I learned the permutation full search while learning the algorithm. I am still a young student, so please point out any mistakes.

What is permutation full search?

This is a full search method that enumerates all the lists in which the elements are rearranged for a list containing different elements. For example, if you search [1,2,3] in a permutation, [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1] , 2], [3,2,1] get 6 permutations.

Implementation example

permutations.rb


from itertools import permutations
list=[1,2,3]
per=permutations(list,2)
for i in per:
    print(i)

output

ans.py


(1, 2)
(1, 3)
(2, 1)
(2, 3)
(3, 1)
(3, 2)

point

-Generate permutations using the library itertools.permutations. -Since permutations is an iterator, it cannot be output as it is. For example, the above code does not print as print (per) -By specifying a number in the second argument of permutations, you can generate a permutation that includes that number.

Competitive Pro Example

https://atcoder.jp/contests/abc150/tasks/abc150_c

This is a good question for beginners who can understand permutation full search. Let's also learn how to use the index function here

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