Find number of pairwise elements in an array with difference k.

Question

Tim · Accepted Answer

Assuming no duplicates, sort an array, iterate through it and find a number a[i]+k, code:

public void find(int[]a, int k){
  if(a==null||a.length==0)return;
  if(k == 0){
    //since the elements are distinct
    return;
  }
  Arrays.sort(a);
  for(int i = 0; i =0){
     System.out.println(a[i] + " " + a[idx]);
    }
  }
}

anonymous · Answer

No sorting required.. use hash map. it is O(n) algorithm

Anonymous · Answer

def find(nums, k):
  dic = {}
  res = []
  for i in nums:
    if i not in dic:
      dic[k+i]=i
    else:
      res.append([dic[i],i])
  return res

nums = [x for x in range(1,11)]
print find(nums, 3)

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