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  1. n=int(input())
  2. A=list(map(int, input().split()))
  3. target=int(input())
  4. counter=0
  5. mp={}
  6. for j in range(n):
  7.     r=target + A[j]
  8.     counter+=mp.get(r, 0)
  9.     mp[A[j]]=mp.get(A[j], 0) + 1
  10. print(counter)
Success #stdin #stdout 0.09s 14172KB
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stdin
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5
10 5 7 3 8
2
stdout
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2
https://ideone.com/Rj6XFi
language:
Python 3 (python  3.12)
created:
11 days ago
visibility:
public

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