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排序函数：permutations()
缺点：不能按照顺序输出下一个更大的排列
from itertools import * s=['a','b','c'] for i in permutations(s,2): #任取2个元素输出
a=i[0]+i[1] print(a) ''' 输出结果 ab ac ba bc ca cb ''' s1=['1','2','3'] for ii in
permutations(s1): #全排列 a=''.join(ii) #将所有元素拼起来 print(a) ''' 输出结果 123 132 213
231 312 321 '''
组合函数：combinations()
from itertools import * s1=['1','2','3'] for ii in combinations(s1,2):
#只输出组合，不用分先后 a=''.join(ii) print(a) ''' 输出结果 12 13 23 '''
【题目】
有n个正整数a1,a2,a3,...,an,将它们连接成一排，相邻数字首尾相接，组成最大的整数。
【样例输入】
3
13 312 343
【样例输出】
343312213
【实验代码】
#暴力输出法 from itertools import * n=int(input()) ans=""
s=list(map(str,input().split())) #按照字符的形式写入 for i in permutations(s):
#每次输出一个全排列 a=''.join(i)#把这个全排列的所有元素拼起来，得到一个串 if ans<a:#比较大小 ans=a print(a)
