Dutor

#include <iostream>
#include <algorithm>
using namespace std;
 
void Perm(char * s)
{
	static char* st = s;
	if(!*(s+1))
	{
		cout<<st<<endl;
		return ;
	}
	else
	{
		for(char *t = s; *t; ++t)
		{
			swap(*s, *t);
			Perm(s + 1);
			swap(*s, *t);
		}
	}
}

#include <iostream>
#include <algorithm>
#include <set>
using namespace std;
 
void Perm(char * s)
{
	static char* st = s;
	if(!*(s+1))
	{
		cout<<st<<endl;
		return ;
	}
	else
	{
		set<char> Set;
		for(char *t = s; *t; ++t)
		{
			size_t size = Set.size();
			Set.insert(*t);
			if(size != Set.size())
			{
				swap(*s, *t);
				Perm(s + 1);
				swap(*s, *t);
			}
		}
	}
}