C Exercises: Count all distinct pairs for a specific difference
C Array: Exercise-80 with Solution
Write a program in C to count all distinct pairs for a specific difference.
Sample Solution:
C Code:
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#define MAX 1000000
int cmpfunc (const void * arr1, const void * b)
{
return ( *(int*)arr1 - *(int*)b );
}
int main()
{
int n,k;
int ctr = 0;
int i;
int arr1[] = {5, 2, 3, 7, 6, 4, 9, 8};
n = sizeof(arr1)/sizeof(arr1[0]);
k=5;
//------------- print original array ------------------
printf("The given array is: \n");
for(i = 0; i < n; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
qsort(arr1, n, sizeof(int), cmpfunc);
int l = 0;
int r = 0;
printf("The distinct pairs for difference %d are: ",k);
while(r < n)
{
if(arr1[r] - arr1[l] == k)
{
printf("[%d, %d] ",arr1[r],arr1[l]);
ctr++;
l++;
r++;
}
else if(arr1[r] - arr1[l] > k)
l++;
else
r++;
}
printf("\nNumber of distinct pairs for difference %d are: %d",k,ctr);
return 0;
}
Sample Output:
The given array is: 5 2 3 7 6 4 9 8 The distinct pairs for difference 5 are: [7, 2] [8, 3] [9, 4] Number of distinct pairs for difference 5 are: 3
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Flowchart:

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Next: The array range is [0..n-1] and the elements are in the range [0..k-1] and k<=n.
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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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