PKU 1509 Glass Beads

字符串最小表示：

 

  
    

   
     
   
     #include
   
     <
   
     stdio.h
   
     >
   
     
#include
   
     <
   
     string
   
     .h
   
     >
   
     

   
     int
   
      min(
   
     int
   
      a,
   
     int
   
      b)
{
 
   
     if
   
     (a
   
     <
   
     b) 
   
     return
   
      a;
 
   
     else
   
      
   
     return
   
      b;
}

   
     int
   
      main()
{
 
   
     char
   
      str[
   
     10001
   
     ],s[
   
     20002
   
     ];
 
   
     int
   
      k,p1,p2,len;
 
   
     int
   
      T,ans;
 scanf(
   
     "
   
     %d
   
     "
   
     ,
   
     &
   
     T);
 
   
     while
   
     (T
   
     --
   
     )
 {
 scanf(
   
     "
   
     %s
   
     "
   
     ,str);
 len
   
     =
   
     strlen(str);
 memset(s,
   
     '
   
     \0
   
     '
   
     ,
   
     sizeof
   
     (s));
 strcpy(s,str);
 strcpy(s
   
     +
   
     len,str);
 p1
   
     =
   
     0
   
     ,p2
   
     =
   
     1
   
     ,k
   
     =
   
     0
   
     ;
 
   
     while
   
     (
   
     1
   
     )
 {
 
   
     if
   
     (s[p1
   
     +
   
     k]
   
     ==
   
     s[p2
   
     +
   
     k])
 {
 k
   
     ++
   
     ;
 
   
     if
   
     (k
   
     ==
   
     len)
 {
 ans
   
     =
   
     min(p1,p2);
 
   
     break
   
     ;
 }
 }
 
   
     else
   
      
   
     if
   
     (s[p1
   
     +
   
     k]
   
     >
   
     s[p2
   
     +
   
     k])
 {
 p1
   
     =
   
     p1
   
     +
   
     k
   
     +
   
     1
   
     ;
 k
   
     =
   
     0
   
     ;
 
   
     if
   
     (p1
   
     ==
   
     p2) p1
   
     ++
   
     ;
 }
 
   
     else
   
     
 {
 p2
   
     =
   
     p2
   
     +
   
     k
   
     +
   
     1
   
     ;
 k
   
     =
   
     0
   
     ;
 
   
     if
   
     (p2
   
     ==
   
     p1) p2
   
     ++
   
     ;
 }
 
   
     if
   
     (p1
   
     >=
   
     len)
 {
 ans
   
     =
   
     p2;
 
   
     break
   
     ;
 }
 
   
     if
   
     (p2
   
     >=
   
     len)
 {
 ans
   
     =
   
     p1;
 
   
     break
   
     ;
 }
 }
 printf(
   
     "
   
     %d\n
   
     "
   
     ,ans
   
     +
   
     1
   
     );
 }
 
   
     return
   
      
   
     0
   
     ;
}