#include<stdio.h>

int main()
{
    long int i,j,L,M,count;
    int Tree[10001];
    scanf("%d %d",&L,&M);
    if (L!=0&&M!=0)
    {
       for (i=0;i<=L;i++)
         Tree[i]=1;
       for (i=0;i<M;i++)
      {
        long int Begin,End;
        scanf("%d %d",&Begin,&End);
        for (j=Begin;j<=End;j++)
          Tree[j]=0;
       }
       count=0;
       for (i=0;i<=L;i++)
          if (Tree[i]==1)
             count++;
    printf ("%d\n",count);
   }
   }

• Re:大家能帮我看看么？怎么会WA?谢过～ (596) huacuilaifa 2012-03-16 21:22:39