字符串全排列代码

Permutation(
char
 a[], 
int
 start, 
int
 end)

{

    
int
 i;

    
char
 temp;

    
if
(start 
==
 end)

    {

        
for
(i 
=
 
0
; i 
<=
 end; i
++
)

            printf(
"
 %c 
"
,a[i]);

        printf(
"
/n
"
);

    }

    
else


    {

        
for
(i 
=
 start; i 
<=
 end; i
++
)

        {

            temp
=
a[start]; a[start]
=
a[i]; a[i]
=
temp;

            Permutation(a, start
+
1
, end);

            temp
=
a[start]; a[start]
=
a[i]; a[i]
=
temp;

        }

    }

}



第二种：


void
 Permutation(char
* pStr, char
* pBegin)


{


      
if
(!pStr || !pBegin)


            
return
;




      
// if pBegin points to the end of string,
 

      
// this round of permutation is finished, 
 

      
// print the permuted string
 

      
if
(*pBegin == '/0'
)


      
{


            
printf("%s/n"
, pStr);


      
}


      
// otherwise, permute string
 

      
else
 

      
{


            
for
(char
* pCh = pBegin; *pCh != '/0'
; ++ pCh)


            
{


                  
// swap pCh and pBegin
 

                  
char
 temp = *pCh;


                  
*pCh = *pBegin;


                  
*pBegin = temp;




                  
Permutation(pStr, pBegin + 1);




                  
// restore pCh and pBegin

                  PS:改变字符串顺序后必须还原回来！

                  temp = *pCh;
                  *pCh = *pBegin;
                  *pBegin = temp;
            }
      }
}