Destroy It!, C++ (gcc)

Destroy It!

#include <bits/stdc++.h>
using namespace std;
vector<int> ans;
vector<int> ans2;
vector<int> v[200005];
int vis[200005];
void DFS(int node,int check)
{
    if(check==1) ans.push_back(node);
    else         ans2.push_back(node);
    vis[node]=1;
    for(int i=0;i<v[node].size();i++)
    {
        if(vis[v[node][i]]==0)
        {
            DFS(v[node][i],-1*check);
        }
    }
}
int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int n,m,x,y;
        scanf("%d%d",&n,&m);
        for(int i=0;i<=n;i++) v[i].clear(),vis[i]=0;
        for(int i=0;i<m;i++)
        {
            scanf("%d%d",&x,&y);
            v[x].push_back(y);
            v[y].push_back(x);
        }
        
        ans.clear();
        ans2.clear();
        DFS(1,1);
        if(ans.size()<=n/2)
        {
            printf("%d\n",ans.size());
            for(int i=0;i<ans.size();i++) printf("%d ",ans[i]);
            printf("\n");
        }
        else
        {
            if(ans2.size()<=n/2)
            {               
                printf("%d\n",ans2.size());
                for(int i=0;i<ans2.size();i++) printf("%d ",ans2[i]);
                printf("\n");
            }
        }
    }
}


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