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  1. a =[1,2,3,4,5,6]
  2. n = len(a)
  3. c0 = 0 
  4. c1 = 0 
  5. c2 = 0 
  6. for i in range(n):
  7.     if a[i] % 3 == 0 :
  8.         c0 +=1 
  9.     elif a[i] % 3 == 1:
  10.         c1 +=1
  11.     else:
  12.         c2 +=1 
  13. print(c0*(c0 -1 )// 2 + c1 * c2)
Success #stdin #stdout 0.11s 14160KB
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https://ideone.com/vF9E6d
đầu ra phải là 3
language:
Python 3 (python  3.12)
created:
8 days ago
visibility:
public

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