poj2255

简单题

View Code

   
     

    
      #include 
    
      <
    
      iostream
    
      >
    
      
#include 
    
      <
    
      cstdio
    
      >
    
      
#include 
    
      <
    
      cstdlib
    
      >
    
      
#include 
    
      <
    
      cstring
    
      >
    
      

    
      using
    
       
    
      namespace
    
       std;


    
      #define
    
       maxn 27
    
      


    
      char
    
       pre[maxn], 
    
      in
    
      [maxn], post[maxn];

    
      int
    
       len;


    
      int
    
       find(
    
      int
    
       l, 
    
      int
    
       r, 
    
      char
    
       ch)
{
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       l; i 
    
      <
    
       r; i
    
      ++
    
      )
 
    
      if
    
       (
    
      in
    
      [i] 
    
      ==
    
       ch)
 
    
      return
    
       i;
 
    
      return
    
       
    
      -
    
      1
    
      ;
}


    
      void
    
       make(
    
      int
    
       prel, 
    
      int
    
       prer, 
    
      int
    
       inl, 
    
      int
    
       inr)
{
 
    
      if
    
       (prel 
    
      >=
    
       prer)
 
    
      return
    
      ;
 
    
      if
    
       (prel 
    
      ==
    
       prer 
    
      -
    
       
    
      1
    
      )
 {
 printf(
    
      "
    
      %c
    
      "
    
      , pre[prel]);
 
    
      return
    
      ;
 }
 
    
      int
    
       pos 
    
      =
    
       find(inl, inr, pre[prel]);
 make(prel 
    
      +
    
       
    
      1
    
      , prel 
    
      +
    
       pos 
    
      -
    
       inl 
    
      +
    
       
    
      1
    
      , inl, pos);
 make(prel 
    
      +
    
       pos 
    
      -
    
       inl 
    
      +
    
       
    
      1
    
      , prer, pos 
    
      +
    
       
    
      1
    
      , inr);
 printf(
    
      "
    
      %c
    
      "
    
      , pre[prel]);
}


    
      int
    
       main()
{
 
    
      //
    
      freopen("t.txt", "r", stdin);
    
      

    
       
    
      while
    
       (scanf(
    
      "
    
      %s%s
    
      "
    
      , pre, 
    
      in
    
      ) 
    
      !=
    
       EOF)
 {
 len 
    
      =
    
       strlen(pre);
 make(
    
      0
    
      , len, 
    
      0
    
      , len);
 printf(
    
      "
    
      \n
    
      "
    
      );
 }
 
    
      return
    
       
    
      0
    
      ;
}