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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. public class Main {
  5.  
  6.     public static void main(String[] args) {
  7.         int[] b = {1, 5, 3, 4, 2};
  8.         int k = 2;
  9.          int count = 0;
  10.         Map<Integer, Integer> freqMap = new HashMap<>();
  11.         for (int j = 0; j < b.length; ++j) {
  12.             int target = b[j] + k;
  13.             if (freqMap.containsKey(target)) {
  14.                 count += freqMap.get(target);
  15.             }
  16.             freqMap.put(b[j], freqMap.getOrDefault(b[j], 0) + 1);
  17.         }
  18.         System.out.print(count);
  19.  
  20.     }
  21. }
  22.  
Success #stdin #stdout 0.1s 52740KB
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https://ideone.com/xFJIN1
language:
Java (12.0.1)
created:
7 hours ago
visibility:
public

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