W.A in CAM5

[janani_sof]

I am trying to do the problem CAM5 and i am getting W.A. Kindly help me out.

#include<iostream>
using namespace std;
int main()
{
    int t,n,e;
    scanf("%d",&t);
    int a[100005];
    while(t--)
    {
              scanf("%d %d",&n,&e);
              for(int i=0;i<n;i++)
              a[i]=0;
              int x,y;
              int cnt=0;
              for(int i=0;i<e;i++)
              {
                      scanf("%d %d",&x,&y);
                      if(a[x]==0 && a[y]==0)
                      {
                             cnt++;
                             a[x]=1;
                             a[y]=1;
                      }
                      else if(a[x]==1)
                      a[y]=1;
                      else
                      a[x]=1;
              }
              for(int i=0;i<n;i++)
              if(a[i]==0)
              cnt++;
              printf("%d\n",cnt);
    }
    return 0;
}