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  1. # your code goes here
  2. n=int(input())
  3. arr=list(map(int, input().split()))
  4. ctr=0
  5. mp={}
  6. for x in arr:
  7. 	real=x%5
  8. 	r=(5-real)%5
  9. 	ctr+=mp.get(r, 0)
  10. 	mp[real]=mp.get(real, 0)+1
  11. print(ctr)
Success #stdin #stdout 0.1s 14060KB
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stdin
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6
2 2 5 5 3 3
stdout
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5
https://ideone.com/I21hM4
Count of pairs whose sum is divisible by 5
language:
Python 3 (python  3.12)
created:
5 hours ago
visibility:
public

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