Permutations of Strings in C – Hacker Rank Solution In C :
Permutations of Strings in C
Problem :
- Objective
- Task
- Example
- Input Format
- Sample Input 0
- Sample Output 0
- Solution
- Explanations
Objective :
ab cd bc
bc ab cd
bc cd ab
cd ab bc
cd bc ab
For example, s = [ab, ab, bc]. Only one instance of a permutation where all elements match should be printed. In other words, if s[0]==s[1] , then print either s[0] s[1] or s[1] s[0] but not both.
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 a[1] = ab are switched. We only print the three visibly unique permutations:
ab bc ab
bc ab ab
Task:
The first line of each test file contains a single integer n, the length of the string array s.
Each of the next n lines contains a string s[i].
For example, s = [ab, ab, bc]. Only one instance of a permutation where all elements match should be printed. In other words, if s[0]==s[1] , then print either s[0] s[1] or s[1] s[0] but not both.
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 n lines contains a string s[i].
Sample Input 0:
2
ab
cd
Sample Output 0:
ab cd
cd ab
Permutations of Strings in C Hacker Rank Solution
Solution Solution :
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int lexicographic_sort(const void *a, const void *b) {
const char **ia = (const char **)a;
const char **ib = (const char **)b;
return strcmp(*ia, *ib);
}
/* A utility function two swap two strings a and b */
void swap(char **a, char **b) {
char *t = *a;
*a = *b;
*b = t;
}
/*
* This function finds the index of the smallest string
* which is greater than ‘first’ and is present in s[l..h]
*/
int find_ceil(char **s, char *first, int l, int h) {
/* initialize index of ceiling element */
int ceil_index = l;
/*
* Now iterate through rest of the elements and find
* the smallest character greater than ‘first’
*/
for (int i = l+1; i <= h; i++)
if ((strcmp(s[i], first) > 0) && (strcmp(s[i], s[ceil_index]) < 0))
ceil_index = i;
return ceil_index;
}
int next_permutation(int n, char **s) {
int theres_more = 1;
int i;
/*
* Find the rightmost string which is smaller than its next
* character. Let us call it ‘first str’
*/
for (i = n-2; i >= 0; i–)
if (strcmp(s[i], s[i+1]) < 0)
break;
/*
* If there is no such string, all are sorted in decreasing order,
* means we just found the last permutation and we are done.
*/
if (i == -1) {
theres_more = 0;
} else {
/*
* Find the ceil of ‘first char’ in right of first character.
* Ceil of a character is the smallest character greater than it
*/
int ceil_index = find_ceil(s, s[i], i + 1, n – 1);
/* Swap first and second strings */
swap(&s[i], &s[ceil_index]);
/* Sort the string on right of ‘first char’ */
qsort(s + i + 1, n – i – 1, sizeof(s[0]), lexicographic_sort);
}
return theres_more;
}
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Explanations : Click Me To Get Explain Video
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What is #Include<stdio.h> ?
#include<stdio.h> is used to included header file in c programming language. It is a Mandetory. It is also Compiler Directives to Include INPUT/OUTPUT related function in our Program. The stdio.h is a file with “.h” extension which is contain the prototypes [not definition] of standard input-output functions used in c program.
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What is int main() ?
‘int main’ means our perform must come thusme whole number at the top of the execution and that we do so by returning zero at the top of the program. zero is that the normal for the “successful execution of the program”.
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What is Printf and Scanf ?
The printf() and scanf() functions area unit used for input and output in C language. each functions area unit inherent library functions, outlined in stdio.h (header file).
What is Compiler ?
The language processor that reads the whole program written in application-oriented language as a full in one go and interprets it into identical program in machine language is named a Compiler. Example: C, C++, C#, Java. compilers/assemblers area unit themselves package, and reside where they were put in on the pc. that additionally implies that you just will have as many/few of every as you wish.
How Permutations of Strings in C – Hacker Rank Solution program works?
- The #include is a preprocessor command that tells the compiler to include the contents of stdio.h (standard input and output) file in the program.
- The stdio.h file contains functions such as scanf() and printf() to take input and display output respectively.
- If you use the printf() function without writing #include <stdio.h>, the program will not compile.
- The execution of a C program starts from the main() function.
- printf() is a library function to send formatted output to the screen. In this program, printf() displays Hello, World! in C text on the screen.
- The return 0; statement is the “Exit status” of the program. In simple terms, the program ends with this statement.
The #include could be a preprocessor command that tells the compiler to incorporate the contents of stdio.h (standard input and output) enter the program.
The stdio.h file contains functions like scanf() and printf() to require input and show output severally.
If you utilize the printf() perform while not writing #include , the program won’t compile.
The execution of a program starts from the main() perform.
printf() could be a library perform to send formatted output to the screen. during this program, printf() displays hello, World! in C text on the screen.
The return 0; statement is the “Exit status” of the program. In straightforward terms, the program ends with this statement.
Hackerrank Answer Permutations of Strings in C – Hacker Rank Solution
Permutations of Strings in C – Hacker Rank Solution may be a sample program designed to acquaint users with most programming languages. Beginners ar introduced to the essential syntax of a programing language by learning the way to print out “Hello World” on the device screen. printf(“Hello World”); This line tells the compiler to show the message “Hello World” on the screen. This line is termed an announcement in C. each statement is supposed to perform some task.
Conclusion :
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