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#include<stdio.h>
size_t arithmetic_triplets(int *arr,size_t sz,int diff)
{
size_t count = 0;
for(size_t i = 0; i < sz; ++i)
{
for(size_t j = i+1; j < sz; ++j)
{
for(size_t k = j+1; k < sz; ++k)
{
if((arr[j] - arr[i] == diff) && (arr[k] - arr[j] == diff))
count++;
}
}
}
return count;
}
int main(void)
{
int arr1[] = {0,1,4,6,7,10};
int arr2[] = {4,5,6,7,8,9};
size_t sz1 = sizeof(arr1)/sizeof(*arr1);
size_t sz2 = sizeof(arr2)/sizeof(*arr2);
printf("%d\n", arithmetic_triplets(arr1,sz1,3));
printf("%d\n", arithmetic_triplets(arr2,sz2,2));
return 0;
}
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