Write a program or algorithm , to print the Permutation of given string taking r at a time. Be commented to explain it.

Question

Suppose , input is "alphabet" , and r is 5,
then you have to print , Permutation taking 5 at a time.
I can print the permutation taking all at a time ,but for doing this(taking r at a time) , complexity increases too much.
Here is my approach :-
1.)Find the all the combination taking r at at a time.
2.)print all the permutation of individual combination taking all at a time.

Did anyone has any other approach to this problem??

Answer 1

Asking or telling? A simple course should teach you how to do that.

Answer 2

is java more harder than any other language

Answer 3

Nope Yogi