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  1. def main():
  2. 	n = int(input())
  3. 	k = int(input())
  4. 	arr = [int(input()) for _ in range(n)]
  5. 	count = 0
  6. 	mp = {}
  7. 	for i in range(n):
  8. 		comp = k+arr[i]
  9. 		if comp in mp:
  10. 			count+=mp[comp]
  11. 		if arr[i] in mp:
  12. 			mp[arr[i]]+=1
  13. 		else:
  14. 			mp[arr[i]]=1
  15. 	print(count)
  16. 	return 
  17.  
  18.  
  19. if __name__=="__main__":
  20. 	main()
  21.  
Success #stdin #stdout 0.07s 13992KB
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https://ideone.com/MjFMUk
language:
Python 3 (python  3.12)
created:
1 hour ago
visibility:
public

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