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  1. # your code goes here
  2. n=int(input())
  3. arr=list(map(int, input().split()))
  4. tg=int(input())
  5. mp={}
  6. ctr=0
  7. for x in arr:
  8. 	r1=x+tg
  9. 	r2=x-tg
  10. 	if tg==0:
  11. 		ctr+=mp.get(r1, 0)
  12. 	else:
  13. 		ctr+=mp.get(r1, 0)
  14. 		ctr+=mp.get(r2, 0)
  15. 	mp[x]=mp.get(x, 0)+1
  16. print(ctr)
Success #stdin #stdout 0.08s 14104KB
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stdin
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5
10 5 7 3 8
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stdout
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3
https://ideone.com/9p1Nvz
language:
Python 3 (python  3.12)
created:
10 hours ago
visibility:
public

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