Python实现Pat 1032. Sharing (25)

谁践踏了优雅 2022-06-04 06:49 145阅读 0赞

### [题目][Link 1] ###

Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given \{32, 321, 3214, 0229, 87\}, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321-3214 with respect to different orders of combinations of these segments, and the smallest number is 0229-321-3214-32-87.

Input Specification:

Each input file contains one test case. Each case gives a positive integer N (<=10000) followed by N number segments. Each segment contains a non-negative integer of no more than 8 digits. All the numbers in a line are separated by a space.

Output Specification:

For each test case, print the smallest number in one line. Do not output leading zeros.

Sample Input:  
5 32 321 3214 0229 87  
Sample Output:  
22932132143287

### 解答 ###

排序题，关键在于字符串的大小比较。比较两个字符串大小时如32和321，如果有相同前缀，则删除较长的字符串中的前缀，并比较剩下的数的大小，即32和321的比较结果应该是32和1的比较结果。

from functools import cmp_to_key
    def cmpt(s1,s2):
         len1=len(s1)
         len2=len(s2)
         maxl=max(len1,len2)
         for i in range(maxl):
             if s1[i%len1]!=s2[i%len2]:
                 return  int(s1[i%len1])-int(s2[i%len2])
         else:
             return 0
    line0=input().split(' ')[1:]
    line0.sort(key=cmp_to_key(cmpt))
    num=''
    for e in line0:
        num+=e
    count=0
    #剔除无效的‘0’
    for e in num:
        if e=='0':
            count+=1
        else:
            break
    num=num[count:]
    #特殊情况
    if not num:
        num='0'
    print (num)

又错了一个小点。不管了  
![这里写图片描述][SouthEast]

[Link 1]: https://www.patest.cn/contests/pat-a-practise/1038
[SouthEast]: /images/20220604/44127ae6afe14e3db66ab55c6cea8d99.png