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因为你定义了a[1000][2];其实这里可以不用这么多的空间。修改的代码如下,就可以AC了

Posted by feima at 2008-11-04 10:38:41 on Problem 2665
In Reply To:高手认为??? Posted by:for_love at 2007-06-11 19:26:12
#include<iostream>
using namespace std;
int main()
{
    long l,s,sum;
	int a, b;
	long i, m;
    
    while(cin>>l>>m&&l!=0&&m!=0)
    {
      sum=0;
      s=0;
      for(i=0;i<m;i++)
      {
	   cin>>a>>b;
	   s=b-a+s+1;
      }
     sum=l+1-s;
   cout<<sum<<endl;
    }
	return 0;
}

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