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Category Archives: Combinatorial

nPr represents n permutation r and value of nPr is (n!) / (n-r)!.  C #include<stdio.h>   int fact(int n) {     if (n <= 1)         return… Read More
Given a set of characters and a positive integer k, print all possible strings of length k that can be formed from the given set.… Read More
Given a string, print all permutations of it in sorted order. For example, if the input string is “ABC”, then output should be “ABC, ACB,… Read More
Given a string str, find its rank among all its permutations when sorted lexicographically. Note: The characters a string are all unique. Examples: Input: str… Read More
Given a string of length n, print all permutations of the given string. Repetition of characters is allowed. Print these permutations in lexicographically sorted order … Read More
Given a string S, the task is to write a program to print all permutations of a given string.  A permutation also called an “arrangement… Read More

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