C Exercises: Count the number of inversion in a given array
C Array: Exercise-66 with Solution
Write a program in C to count the number of inversions in a given array.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
int inv_count(int arr1[], int n)
{
int inversionCtr = 0;
printf("The inversions are: ");
for (int i = 0; i < n - 1; i++)
{
for (int j = i + 1; j < n; j++)
if (arr1[i] > arr1[j])
{
printf("(%d, %d) ",arr1[i],arr1[j]);
inversionCtr++;
}
}
return inversionCtr;
}
int main()
{
int arr1[] = { 1, 9, 6, 4, 5 };
int n = sizeof(arr1)/sizeof(arr1[0]);
int i;
//------------- print original array ------------------
printf("The given array is : ");
for(i = 0; i < n; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
printf("\nThe number of inversion can be formed from the array is: %d", inv_count(arr1, n));
return 0;
}
Sample Output:
The given array is : 1 9 6 4 5 The inversions are: (9, 6) (9, 4) (9, 5) (6, 4) (6, 5) The number of inversion can be formed from the array is: 5
Flowchart:

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Previous: Write a program in C to find the product of an array such that product is equal to the product of all the elements of arr[] except arr[i].
Next: Write a program in C to search an element in a row wise and column wise sorted matrix.
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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
Ref : https://bit.ly/3dIwfkP
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