取出列表中第N大的数

array=list(range(10))
random.shuffle(array)
print(array)
def func1(array,n):
    d,k={},n
    while k>0:
        maxnum,maxindex=-float("inf"),0
        for index,value in enumerate(array):
            if index not in d:
                if value>=maxnum:
                    maxnum=value
                    maxindex=index
        d[maxindex]=maxnum
        k-=1
    return list(d.values())[2]#因为python现在的版本字典默认是有序的,所以可以这么用

def list2bucket(li,i):
    buckets=[[] for _ in range(10)]
    for val in li:
        digit=val//(10**i)%10
        buckets[digit].append(val)
    return buckets

def bucket2lit(buckets):
    li=[]
    for bucket in buckets:
        for val in bucket:
            li.append(val)
    return li


def radix_sort(li):
    max_val=max(li)
    i=0
    while 10**i<=max_val:
        li=bucket2lit(list2bucket(li,i))
        i+=1
    return li

print(radix_sort(array)[-3])