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  1. # thg nào chép code tao méc admin
  2. a=int(input())
  3. b = [int(x) for x in input().split()]
  4. c = [b[0]]
  5. for i in b[1:]:
  6.     if i!=c[-1]:
  7.         c.append(i)
  8. a=len(c)
  9. dpa = []
  10. dpb = [0] * (a+1)
  11. for i in range(2,a+1):
  12.     dp=[]
  13.     for j in range(a-i+1):
  14.         if c[j] == c[j+i-1]:
  15.             dp.append(min(dpb[j], dpb[j+1], dpa[j+1])+1)
  16.         else:
  17.             dp.append(min(dpb[j], dpb[j+1])+1)
  18.     dpa, dpb = dpb, dp
  19. print(dpb[0])
  20.  
Success #stdin #stdout 0.04s 9624KB
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https://ideone.com/BPIYsW
language:
Python 3 (python  3.9.5)
created:
141 days ago
visibility:
secret

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