一、题目
Problem C
Generating Fast, Sorted Permutation
Input: Standard Input
Output: Standard Output
Generating permutation has always been an important problem in computer science. In this problem you will have to generate the permutation of a given string in ascending order. Remember that your algorithm must be efficient.
Input
The first line of the input contains an integer n, which indicates how many strings to follow. The next n lines contain n strings. Strings will only contain alpha numerals and never contain any space. The maximum length of the string is 10.
Output
For each input string print all the permutations possible in ascending order. Not that the strings should be treated, as case sensitive strings and no permutation should be repeated. A blank line should follow each output set.
Sample Input
3
ab
abc
bca
二、分析
利用函数，先对字母进行排序，然后全排列顺序输出。
注意此题uva较狠指出在于最后有一行空行，A blank line should follow each output set.
小弟习惯性的处理掉了，结果WA了3次，看来画蛇添足了啊……
三、AC源代码
View Code
1 #include <iostream>
2 #include <algorithm>
3 #include <string>
4 using namespace std;
5 int main()
6 {
7 int n;
8 string str;
9 cin>>n;
10 while(n--)
11 {
12 cin>>str;
13 sort(str.begin(),str.end());
14 do
15 {
16 cout<<str<<endl;
17 }while(next_permutation(str.begin(),str.end()));
18
19 cout<<endl;
20 }
21 return 0;
22 }
