Geeksforgeeks

Error

Given an array **A[] **and positive integer **K**, the task is to count total number of pairs in the array whose sum is divisible by **K**.

**Example 1:**

**Input :**
A[] = {2, 2, 1, 7, 5, 3}, K = 4
**Output :** 5
**Explanation : **
There are five pairs possible whose sum
is divisible by '4' i.e., (2, 2),
(1, 7), (7, 5), (1, 3) and (5, 3)

**Example 2:**

**Input :**
A[] = {5, 9, 36, 74, 52, 31, 42}, K = 3
**Output :** 7
**Explanation : **
There are seven pairs whose sum is divisible by 3,
i.e, (5, 9), (9, 36), (74, 52), (36, 42), (74, 31),
(31, 5) and (5, 52).

You don't have to read input or print anything. Your task is to complete the function **countKdivPairs()** which takes the array, it's size and an integer K as input and returns the count of pairs whose sum is divisible by K.

1 <= N <=10^6

1 <= A[i] <= 10^6

1 <= K <= 100

We are replacing the old Disqus forum with the new Discussions section given below.

Click here to view old Disqus comments.

Click here to view old Disqus comments.

Login to report an issue on this page.

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

YesLoading...

Count pairs in array divisible by K

...