Pairs
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;
public class Solution {
// Complete the pairs function below.
static int pairs(int k, int[] arr) {
HashSet<Integer> d = new HashSet<Integer>();
for (int i = 0; i < arr.length; i++) {
d.add(arr[i]);
}
int count = 0;
for (int i : d) {
if (d.contains(i + k)) {
count++;
}
}
return count;
}
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) throws IOException {
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
String[] nk = scanner.nextLine().split(" ");
int n = Integer.parseInt(nk[0]);
int k = Integer.parseInt(nk[1]);
int[] arr = new int[n];
String[] arrItems = scanner.nextLine().split(" ");
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
for (int i = 0; i < n; i++) {
int arrItem = Integer.parseInt(arrItems[i]);
arr[i] = arrItem;
}
int result = pairs(k, arr);
bufferedWriter.write(String.valueOf(result));
bufferedWriter.newLine();
bufferedWriter.close();
scanner.close();
}
}
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