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;
}