输入一个字符串，打印出该字符串中字符的所有排列

/*
* Copyright (c) 2011 alexingcool. All Rights Reserved.
*/
#include <iostream>
#include <algorithm>

using namespace std;

char array[] = {'a', 'b', 'c'};
const int size = sizeof array / sizeof *array;

void Perm(char *array, int pos, int last)
{
if (pos == last) {
copy(array, array + size, ostream_iterator<char>(cout, ""));
cout << endl;
}
else {
for(int i = pos; i <= last; i++) {
swap(array[i], array[pos]);
Perm(array, pos + 1, last);
swap(array[i], array[pos]);
}
}
}

void main()
{
Perm(array, 0, 2);
}