简单的全排列算法实现

1　{2,3,4,5}的全排列
2  {1,3,4,5}的全排列
3  {1,2,4,5}的全排列
4  {1,2,3,5}的全排列
5  {1,2,3,4}的全排列

12345
21345
31245
41235
51234

#include <iostream>
using namespace std;

static int n = 0;

void swapint(int *p, int *q)
{
    int tmp = *p;
    *p = *q;
    *q = tmp;
}

void fullarray(int a[], 
        int iLen,   // 数组长度
        int iStart) // 开始下标
{
    if (iLen == iStart)
    {
        for (int i = 0; i < iLen; ++i)
        {
            cout << a[i] << " ";
        }
        cout << "\n";
        n++;
    }
    else
    {
        for(int j = iStart; j < iLen; ++j)
        {
            swapint(&a[iStart], &a[j]);
            fullarray(a, iLen, iStart + 1);
            swapint(&a[iStart], &a[j]);
        }
    }
}

int main()
{
    int a[] = {1,2,3,4,5};
    fullarray(a, sizeof(a)/sizeof(int), 0);
    cout << "总共" << n << "种" << endl;

    return 0;
}