from functools import reduce def multiply(arr): return reduce(lambda x, y: x*y, arr, 1) def func(arr, m): if m == len(arr): return multiply(arr) elif m == 0: return multiply([1 - p for p in arr]) else: result = 0 for i, p in enumerate(arr[:len(arr) - m + 1]): # перебор по индексу + ограничиваю перебор справа числом M result += multiply([1 - p for p in arr[:i]]) * p * func(arr[(i+1):], m-1) return result def calculate_and_print(arr, m): if arr is None or len(arr) == 0 or m < 0 or m > len(arr): print('Invalid data') else: print('arr={}, m={}, res={}'.format(arr, m, func(arr, m))) calculate_and_print([0, 1, 0], 0) calculate_and_print([0.2, 1, 1], 1) calculate_and_print([0.2, 1, 1], 2) calculate_and_print([0.2, 1, 1], 3) calculate_and_print([0.5, 0.5, 0.5], 0) calculate_and_print([0.5, 0.5, 0.5], 1) calculate_and_print([0.5, 0.5, 0.5], 2) calculate_and_print([0.5, 0.5, 0.5], 3)
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