19 lines
342 B
Python
19 lines
342 B
Python
N = int(input())
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c = 0
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for i in range(N):
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s = input()
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beforehead = s[0]
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befores = set()
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befores.add(beforehead)
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for t in s:
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if t == beforehead:
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continue
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elif t in befores:
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break
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else:
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beforehead = t
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befores.add(t)
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else:
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c+=1
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print(c) |