uva-10098

　　 所有的排列,但是要不重复

#include<stdio.h>
#include<iostream>
#include<sstream>
#include<queue>
#include<map>
#include<memory.h>
#include <math.h>
#include<time.h>
#include <stdlib.h>
#include <algorithm>
using namespace std;
#define N 12
int vis[N];
char a[N];
char b[N];
int length;
int n;
int final = 0;
void dfs(int cur)
{
	if(cur == length)
	{
		for(int i = 0; i < cur; i++)
			cout << b[i];
		cout << endl;
		return;
	}
	for(int i = 0; i < length; i++)
	{
		if(!i || a[i] != a[i - 1])
		{
			int c1 = 0, c2 = 0;
			for(int j = 0; j < cur; j++)
				if(b[j] == a[i])
					c1++;

			for(int j = 0; j < length; j++)
				if(a[j] == a[i])
					c2++;
			if(c1 < c2)
			{
				b[cur] = a[i];
				dfs(cur + 1);
			}
		}

	}
}
void sort()
{
	for(int i = 0; i < length; i++)
	{
		for(int j = 1; j < length - i; j++)
		{
			if(a[j] < a[j - 1])
			{
				char cc = a[j];
				a[j] = a[j - 1];
				a[j - 1] = cc;
			}
		}
	}

}
int main(const int argc, char** argv)
{
	freopen("d:\1.txt", "r", stdin);
	cin >> n;
	while (n--)
	{
		memset(a, 0, sizeof(a));
		scanf("%s", a);
		length = strlen(a);
		sort();
		dfs(0);
		//if(n != 0)
			cout << endl;
	}
	return 0;
}

　　

#include<stdio.h>
#include<iostream>
#include<sstream>
#include<queue>
#include<map>
#include<memory.h>
#include <math.h>
#include<time.h>
#include <stdlib.h>
#include <algorithm>
using namespace std;
#define N 12
int vis[N];
char a[N];
char b[N];
int length;
int n;
int final = 0;
void dfs(int cur)
{
	if(cur == length)
	{
		for(int i = 0; i < cur; i++)
			cout << b[i];
		cout << endl;
		return;
	}
	for(int i = 0; i < length; i++)
	{
		if(!i || a[i] != a[i - 1])
		{
			int c1 = 0, c2 = 0;
			for(int j = 0; j < cur; j++)
				if(b[j] == a[i])
					c1++;

			for(int j = 0; j < length; j++)
				if(a[j] == a[i])
					c2++;
			if(c1 < c2)
			{
				b[cur] = a[i];
				dfs(cur + 1);
			}
		}

	}
}
void sort()
{
	for(int i = 0; i < length; i++)
	{
		for(int j = 1; j < length - i; j++)
		{
			if(a[j] < a[j - 1])
			{
				char cc = a[j];
				a[j] = a[j - 1];
				a[j - 1] = cc;
			}
		}
	}

}
int main(const int argc, char** argv)
{
	freopen("d:\1.txt", "r", stdin);
	cin >> n;
	while (n--)
	{
		memset(a, 0, sizeof(a));
		scanf("%s", a);
		length = strlen(a);
		sort();
		do
		{
			cout << a << endl;
		} while (next_permutation(a, a + length));
		cout << endl;
	}
	return 0;
}

　　想看库函数源码了。。。。。