poj2602

高精度加法，putchar(),getchar()比scanf(),printf()快。效率相差10多倍。

View Code

   
     

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

    
      using
    
       
    
      namespace
    
       std;


    
      #define
    
       maxn 1000006
    
      


    
      int
    
       f1[maxn], f2[maxn];

    
      char
    
       ans[maxn];


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

    
       
    
      int
    
       n;
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      n);
 getchar();
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      <
    
       n; i
    
      ++
    
      )
 {
 f1[i] 
    
      =
    
       getchar() 
    
      -
    
       
    
      '
    
      0
    
      '
    
      ;
 getchar();
 f2[i] 
    
      =
    
       getchar() 
    
      -
    
       
    
      '
    
      0
    
      '
    
      ;
 getchar();
 }
 
    
      int
    
       temp 
    
      =
    
       
    
      0
    
      ;
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       n 
    
      -
    
       
    
      1
    
      ; i 
    
      >=
    
       
    
      0
    
      ; i
    
      --
    
      )
 {
 ans[i] 
    
      =
    
       ((f1[i] 
    
      +
    
       f2[i] 
    
      +
    
       temp) 
    
      %
    
       
    
      10
    
      ) 
    
      +
    
       
    
      '
    
      0
    
      '
    
      ;
 temp 
    
      =
    
       (f1[i] 
    
      +
    
       f2[i] 
    
      +
    
       temp) 
    
      /
    
       
    
      10
    
      ;
 }
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      <
    
       n; i
    
      ++
    
      )
 putchar(ans[i]);
 putchar(
    
      '
    
      \n
    
      '
    
      );
 
    
      return
    
       
    
      0
    
      ;
}