剑指offer--字符串排列

#include<iostream>
using namespace std;
void Permutation(char* pstr, char* pbegin)
{
  if (*pbegin == '\0')
    printf("%s\n", pstr);
  else
  {
    for (char* pch = pbegin; *pch != '\0'; ++pch)
    {
      char temp = *pch;
      *pch = *pbegin;
      *pbegin = temp;
      Permutation(pstr, pbegin + 1);
      temp = *pch;
      *pch = *pbegin;
      *pbegin = temp;
    }
  }
}

void Permutation(char* pstr)
{
  if (pstr == NULL)
    return;
  Permutation(pstr, pstr);
}
int main()
{
  char str[] = "abc";
  Permutation(str);
  system("pause");
  return 0;
}