fork download
copy 
  1. def count(n, arr, k):
  2. 	count = 0
  3. 	seen = {}
  4.  
  5. 	for i in range(n):
  6. 		comp = k-arr[i]
  7. 		if comp in seen:
  8. 			count+=1
  9. 		seen[arr[i]] = True
  10. 	return count
  11.  
  12. if __name__=="__main__":
  13. 	n = int(input())
  14. 	k = int(input())
  15. 	arr = [int(input()) for _ in range(n)]
  16. 	ans = count(n, arr, k)
  17. 	print(ans)
  18.  
  19.  
Success #stdin #stdout 0.07s 13988KB
comments (?)
stdin
copy 
4
2
1
1
1
1
stdout
copy 
3
https://ideone.com/kdd40d
language:
Python 3 (python  3.12)
created:
1 hour ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!