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Python:实现ugly numbers丑数算法(附完整源码)


Python:实现ugly numbers丑数算法

def ugly_numbers(n: int) -> int:

ugly_nums = [1]

i2, i3, i5 = 0, 0, 0
next_2 = ugly_nums[i2] * 2
next_3 = ugly_nums[i3] * 3
next_5 = ugly_nums[i5] * 5

for i in range(1, n):
next_num = min(next_2, next_3, next_5)
ugly_nums.append(next_num)
if next_num == next_2:
i2 += 1
next_2 = ugly_nums[i2] * 2
if next_num == next_3:
i3 += 1
next_3 = ugly_nums[i3] * 3
if next_num == next_5:
i5 += 1
next_5 = ugly_nums[i5] * 5
return ugly_nums[-1]


if __name__ == "__main__":
from doctest import testmod

testmod(verbose=True)
print(f"{ugly_numbers(200) = }")


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