poj2665

简单题

View Code

   
     

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

    
      using
    
       
    
      namespace
    
       std;


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

    
       
    
      int
    
       l, m;
 
    
      while
    
       (scanf(
    
      "
    
      %d%d
    
      "
    
      , 
    
      &
    
      l, 
    
      &
    
      m) 
    
      !=
    
       EOF 
    
      &&
    
       
    
      !
    
      (l 
    
      ==
    
       
    
      0
    
       
    
      &&
    
       m 
    
      ==
    
       
    
      0
    
      ))
 {
 
    
      int
    
       ans 
    
      =
    
       l 
    
      +
    
       
    
      1
    
      ;
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      <
    
       m; i
    
      ++
    
      )
 {
 
    
      int
    
       a, b;
 scanf(
    
      "
    
      %d%d
    
      "
    
      , 
    
      &
    
      a, 
    
      &
    
      b);
 ans 
    
      -=
    
       b 
    
      -
    
       a 
    
      +
    
       
    
      1
    
      ;
 }
 printf(
    
      "
    
      %d\n
    
      "
    
      , ans);
 }
 
    
      return
    
       
    
      0
    
      ;
}