# 贪心算法-找零问题

1分，2分，5分，1角，2角，5角，1元面值硬币，怎么找零给顾客硬币数最少

```python
'''
贪心思路：从面值最大的开始找起
'''
d=[0.01,0.02,0.05,0.1,0.2,0.5,1.0]

d_num=input('零钱数量：')
d_num=[int(i) for i in d_num.split(' ')] #每个币种数量

sum_cash=sum([d[i]*d_num[i] for i in range(len(d_num))]) #硬币总面值
print('硬币总面值:',sum_cash)

back_cash=input('找零钱数：')
back_cash=float(back_cash)


if back_cash>sum_cash:
    print('无法找零')
else:
    sum_cash=sum_cash-back_cash
    i=6 #尝试遍历7个币种，从面值最大的开始，
    while i>=0:
        if back_cash>=d[i]:
            n=int(back_cash/d[i]) #需要找i号币数量
            if n>=d_num[i]:#如果没那么多数量，全部取出
                n=d_num[i]
            back_cash-=n*d[i]
            print('%d号币:%f,找回%d个'%(i,d[i],n))
        i-=1
```

```
零钱数量：12 11 11 11 11 11 11
硬币总面值: 20.69
找零钱数：1.8
6号币:1.000000,找回1个
5号币:0.500000,找回1个
4号币:0.200000,找回1个
3号币:0.100000,找回1个
```


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