y*******n 发帖数: 99 | 1 k种不同颜色的球,个数为[n1, n2, n3, ..., n_k], 如何sample without
replacement?要求sample operation time complexity log(k)
class WeightedSample:
def __init__(self, num_balls):
pass
def sample(self):
pass # return a color in time complexity of log(k)
看了https://en.wikipedia.org/wiki/Reservoir_sampling 似乎也做不到logk, 这里
面有什么技巧吗? |
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