求字符串的所有子集

// 字符串的组合输出.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "string.h"
#include <stdlib.h>
#include <vector>
#include <iostream>
using namespace std; 


/*
* 输出 
* 1
* 12
* 123
* 1234
* 124
* 13
* 134
* 14
* 2
* 23
* 234
* 24
* 3
* 34
* 4
*/


void print(std::vector<char> &vec) //输入参数为需要打印的数组，以及要打印的长度
{
    std::vector<char>::iterator itr;
    for (itr = vec.begin(); itr != vec.end(); ++itr)
    {
        cout << *itr;
    }
    cout << endl;
}

void reSort(char *pArray, int len, std::vector<char> &vector)
{
    print(vector);

    if (len <= 0)
        return;

    for (int idx = 0; idx < len; idx++)
    {
        vector.push_back(pArray[idx]);
        reSort(&pArray[idx+1], len-idx-1, vector);
        vector.pop_back();
    }
}

void MainReSort(char *pArray, int len)
{
    std::vector<char> vector;

    for (int idx=0; idx<len; idx++)
    {
        vector.push_back(pArray[idx]);
        reSort(&pArray[idx+1], len-idx-1, vector);
        vector.pop_back();
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    char src[] = {"1234"};

    MainReSort(src, 4);

    return 0;
}