Cerinta completa

Given an array of integers and a target value, determine the number of pairs of array elements that have a difference equal to the target value.

Example

There are three values that differ by : , , and . Return .

Function Description

Complete the pairs function below.

pairs has the following parameter(s):

  • int k: an integer, the target difference
  • int arr[n]: an array of integers

Returns

  • int: the number of pairs that satisfy the criterion

Input Format

The first line contains two space-separated integers and , the size of and the target value.
The second line contains space-separated integers of the array .

Constraints

  • each integer will be unique

Sample Input

STDIN       Function
-----       --------
5 2         arr[] size n = 5, k =2
1 5 3 4 2   arr = [1, 5, 3, 4, 2]

Sample Output

3

Explanation

There are 3 pairs of integers in the set with a difference of 2: [5,3], [4,2] and [3,1]. .

Limbajul de programare folosit: java8

Cod:

import java.util.Arrays;
import java.util.Scanner;
import java.util.Set;
import java.util.stream.Collectors;

public class Solution {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int k = sc.nextInt();
		int[] arr = new int[n];
		for (int i = 0; i < arr.length; i++) {
			arr[i] = sc.nextInt();
		}
		System.out.println(solve(arr, k));

		sc.close();
	}

	static int solve(int[] arr, int k) {
		Set<Integer> numbers = Arrays.stream(arr).boxed().collect(Collectors.toSet());

		return (int) Arrays.stream(arr).filter(number -> numbers.contains(number + k)).count();
	}
}

Scor obtinut: 1.0

Submission ID: 464602856

Link challenge: https://www.hackerrank.com/challenges/pairs/problem

Pairs