Hello coders, In this post, you will learn how to solve the **Permutations of Strings in C Hacker Rank Solution**. This problem is a part of the **HackerRank C Programming** Series.

We also provide Hackerrank solutions in C++, Java programming, and Python Programming languages so whatever your domain we will give you an answer in your field.

You can practice and submit all HackerRank problem solutions in one place. Find a solution for other domains and Sub-domain. I.e. Hacker Rank solution for HackerRank C Programming, HackerRank C++ Programming, HackerRank Java Programming, HackerRank Python Programming, HackerRank Linux Shell, HackerRank SQL Programming, and HackerRank 10 days of Javascript.

As you already know that this site does not contain only the Hacker Rank solutions here, you can also find the solution for other problems. I.e. Web Technology,Data Structures, RDBMS Programs, Java Programs Solutions, Fiverr Skills Test answers, Google Course Answers, Linkedin Assessment, and Coursera Quiz Answers.

## Permutations of Strings in C Hacker Rank Solution

### Problem

Strings are usually ordered in lexicographical order. That means they are ordered by comparing their leftmost different characters. For example * abc < abd*, because

*. Also*

**c < d***because*

**z > yyy***. If one string is an exact prefix of the other it is lexicographically smaller, e.g.,*

**z > y***.*

**gh < ghij**Given an array of strings sorted in lexicographical order, print all of its permutations in strict lexicographical order. If two permutations look the same, only print one of them. See the ‘note’ below for an example.

Complete the function next_permutation which generates the permutations in the described order.

For example, * s = [ab, bc, cd]*. The six permutations in correct order are:

ab bc cd ab cd bc bc ab cd bc cd ab cd ab bc cd bc ab

**Note:** There may be two or more of the same string as elements of * s*.

For example,

*. Only one instance of a permutation where all elements match should be printed. In other words, if*

**s = [ab, ab, bc]***, then print either*

**s[0]==s[1]***or*

**s[0] s[1]***but not both.*

**s[1] s[0]**A three element array having three discrete elements has six permutations as shown above. In this case, there are three matching pairs of permutations where * s[0] = ab* and

*are switched. We only print the three visibly unique permutations:*

**a[1] = ab**ab ab bc ab bc ab bc ab ab

**Input Format :**

The first line of each test file contains a single integer * n*, the length of the string array

*.*

**s**Each of the next

*lines contains a string*

**n***.*

**s[i]****Constraints :**

- 2<=n<=9
- a<=s[i]<=10
- s[i] contains only lowercase English letters.

**Output Format :**

Print each permutation as a list of space-separated strings on a single line.

**Sample Input 0 :**

2ab cd

**Sample Output 0 :**

ab cd cd ab

**Sample Input 1 :**

3a bc bc

**Sample Output 1 :**

a bc bc bc a bc bc bc a

**Explanation 1**

This is similar to the **note** above. Only three of the six permutations are printed to avoid redundancy in output.

### Permutations of Strings in C Hacker Rank Solution

#include <stdio.h> #include <stdlib.h> #include <string.h> void swap(char **s, int i, int j) { char * tmp = s[i]; s[i] = s[j]; s[j] = tmp; } void reverse(char **s, int start, int end) { while(start<end) { swap(s,start++,end--); } } int next_permutation(int n, char **s) { for(int i=n-2;i>-1;i--) { if(strcmp(s[i+1],s[i])>0) { //get min max for(int j=n-1;j>i;j--) { if(strcmp(s[j],s[i])>0) { //do swap swap(s,i,j); // do reverse reverse(s,i+1,n-1); return 1; } } } } return 0; } int main() { char **s; int n; scanf("%d", &n); s = calloc(n, sizeof(char*)); for (int i = 0; i < n; i++) { s[i] = calloc(11, sizeof(char)); scanf("%s", s[i]); } do { for (int i = 0; i < n; i++) printf("%s%c", s[i], i == n - 1 ? '\n' : ' '); } while (next_permutation(n, s)); for (int i = 0; i < n; i++) free(s[i]); free(s); return 0; }

**Disclaimer: **The above Problem **(Permutations of Strings in C )** is generated by **Hackerrank** but the Solution is Provided by **Chase2Learn**. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

#### Is HackerRank good for C?

HackerRank**HackerRank offers you to solve these programming challenges in any of various programming languages such as C, Java, Python, Ruby, etc**. Apart from this, participants can solve the problems in various computer science domains like algorithms, machine learning, and artificial intelligence.

#### What is meant by HackerRank?

HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses. Developers compete by writing programs according to provided specifications. Wikipedia

#### Is HackerRank good for beginners?

**HackerRank is very good for beginners** so even if you want to print your first program “Hello World!” then definitely HackerRank gives this opportunity to you. It has a pretty good UI with boilerplate code pre-written that helps beginners to start competitive coding.

#### What is C programming in simple words?

C is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C’s features cleanly reflect the capabilities of the targeted CPUs. Wikipedia

#### Where can I find HackerRank solutions in C?

in this post you will get all the *solutions* of *HackerRank C* Problems.

Finally, we are now, in the end, I just want to conclude some important message for you

**Note:-** I compile all programs, if there is any case program is not working and showing an error please let me know in the comment section. If you are using adblocker, please disable adblocker because some functions of the site may not work correctly.

Please share our posts on social media platforms and also suggest to your friends to Join Our Groups. Don’t forget to subscribe.