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- #ох, сколько я такого говна нарешал) Прям удивительно что впервые пишу работающую прогу
- n = int(input())
- even = [0]
- odd = [0]
- it = 0
- for i in range(n):
- now = int(input())
- if now == 0:
- it += 1
- even += [0]
- odd += [0]
- elif now % 2 == 0:
- even[it] += 1
- else:
- odd[it] += 1
- res = 0
- for i in range(len(even)):
- for j in range(i + 1, len(even)):
- res += even[i] * even[j] + odd[i] * odd[j]
- print(res)
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