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牛人们帮忙看一下,为什么WA啊???谢谢了!!!

Posted by jiabiao at 2005-08-26 23:20:17 on Problem 2575
#include<stdio.h>
#include<math.h>
void main()
{
   int a[3000],n,i,j,b[3000],t,flag=1;
   while(scanf("%d",&n)!=EOF)
   {
      for(i=0;i<n;i++)
      {
         scanf("%d",&a[i]);
         if(i!=0)
         b[i-1]=abs(a[i]-a[i-1]);
      }
      for(i=0;i<n-1;i++)
        for(j=0;j<n-2-i;j++)
          if(b[j]>b[j+1])
          {t=b[j];b[j]=b[j+1];b[j+1]=t;}
      for(i=1;i<n-1;i++)
       {
        if(b[0]==1&&b[i]-b[i-1]==1&&b[n-2]==n-1)
        flag=1;
        if(b[0]!=1||b[i]-b[i-1]!=1||b[n-2]!=n-1)
        flag=0;
       }
      if(flag==1)
      printf("Jolly\n");
      else
      printf("Not jolly\n");
   }
}

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