stl实现全排列

#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
char perm[10000];
int main()
{
char tmp;
int num=0,i;
while((tmp=getchar())&&tmp!='\n')
if(tmp!=' ')
perm[num++]=tmp;
do
{
for(i=0;i<num;i++)
{
if(i)
printf(" ");
putchar(perm[i]);
}
printf("\n");
}while(next_permutation(perm,perm+num));
}