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技术江湖 程序人生

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微信红包算法

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用python实现的微信红包算法,有些地方还是没有搞明白,如果有人知道还请指教

算法精要

主要在于随机数的生成

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#这一句是重点,不知道为什么
#如果比2.0小则前面的红包是小,后面大
#如果比2.0大则前面是大红包,后面是小红包
max = remainAmount / remainSize * 2.0

源代码

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#! encoding:utf-8

import random

import math


def getMoney(remainAmount,remainSize):
    if remainSize == 1:
        money = round(remainAmount * 100) / 100
    else: 
        min = 0.01
        #这一句是重点,不知道为什么
        #如果比2.0小则前面的红包是小,后面大
        #如果比2.0大则前面是大红包,后面是小红包
        max = remainAmount / remainSize * 2.0
        #print remainAmount,remainSize,max

        money = random.random() * max
        money = money <= min and min or money
        money = math.floor(money * 100) / 100;

    return money

#模拟发放
def simulateRedPacket(amount,num):
    remainSize = num
    remainAmount = amount

    #初始化数组
    results = [0 for x in xrange(0,num)]

    #模拟发红包
    for x in xrange(0,num):
        money = getMoney(remainAmount,remainSize)
        remainSize  -= 1
        remainAmount -= money
        results[x] = money


    #计算发放总额
    sum = 0
    for x in results:
        sum += x

    if amount - sum > 0.01:
        #发放结果
        pass
    print results
    print ", ".join([" = ".join(["金额",str(amount)])," = ".join(["数量",str(num)])," = ".join(["已发放",str(sum)])," = ".join(["差额",str(amount - sum)])])

if __name__ == '__main__':
    for x in xrange(1,2000):
        #金额
        amount = round(random.random() * 100) * 1000 / 100
        #红包数量
        num = random.randint(1,100)

        simulateRedPacket(amount,num)