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| import random | |
| TEST_N = 10000000 | |
| def calc(target): | |
| rate_max = 1 | |
| rate_min = 0 | |
| while True: | |
| rate = dt = (rate_max + rate_min)/2.0 | |
| hit = 0 | |
| for i in xrange(TEST_N): | |
| if random.random() < rate: | |
| hit += 1 | |
| rate = dt | |
| rate += dt | |
| now = hit * 1.0 / TEST_N | |
| if abs(now - target) < 0.0001: | |
| return dt | |
| if now > target: | |
| rate_max = dt | |
| else: | |
| rate_min = dt | |
| if rate_max < rate_min: | |
| return dt | |
| rate = calc(0.1) | |
| print "rate:", rate |
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