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  1. # your code goes here
  2. n=int(input())
  3. A=list(map(int,input().split()))
  4. target=int(input())
  5. counter=0
  6. mp={}
  7. for j in range(n):
  8.     r1=A[j]+target
  9.     r2=A[j]-target
  10.     if target==0:
  11.         counter+=mp.get(r1,0)
  12.     else:
  13.         counter+=mp.get(r1,0)
  14.         counter+=mp.get(r2,0)
  15.     mp[A[j]]=mp.get(A[j],0)+1
  16. print(counter)
Success #stdin #stdout 0.08s 14124KB
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stdin
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5
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2
stdout
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3
https://ideone.com/u6dMBQ
language:
Python 3 (python  3.12)
created:
11 days ago
visibility:
public

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