14 lines
278 B
Python
14 lines
278 B
Python
n = int(input())
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uniforms = []
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for _ in range(n):
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h, a = input().split(' ')
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uniforms.append([h,a])
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count = 0
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for idx_i, i in enumerate(uniforms):
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for idx_j, j in enumerate(uniforms):
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if idx_i != idx_j and i[0] == j[1]:
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count += 1
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print(count)
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