Code : All connected components

#include <bits/stdc++.h>
using namespace std;
void dfs(int **arr,int V,int sv,bool *visit,vector<int> *ans){
    //cout<<sv<<" ";
    ans->push_back(sv);
    visit[sv]=true;
    for(int i=0;i<V;i++){
        if(i==sv){
            continue;
        }
        if(arr[i][sv]==1 && !visit[i]){
            dfs(arr,V,i,visit,ans);
        }
    }
}
void pdfs(int **arr,int V){
     bool *visit=new bool[V];
    for(int i=0;i<V;i++){
        visit[i]=false;
    }
    int idx=0;
    for(int i=0;i<V;i++){
        if(!visit[i]){
            vector<int> *ans=new vector<int> ();
            dfs(arr,V,i,visit,ans);
            sort(ans->begin(),ans->end());
            for(int j=0;j<ans->size();j++){
            cout<<ans->at(j)<<" ";
            }
            cout<<endl;
        }
    }
    delete [] visit;
}
int main()
{
  int V, E;
    cin >> V >> E;
    int **arr=new int*[V];
    for(int i=0;i<V;i++){
        arr[i]=new int[V];
        for(int j=0;j<V;j++){
            arr[i][j]=0;
        }
    }
    for(int i=0;i<E;i++){
        int f,s;cin>>f>>s;
        arr[f][s]=1;
        arr[s][f]=1;
    }
   
    pdfs(arr,V);
    for(int i=0;i<V;i++){
        delete [] arr[i];
    }
    delete [] arr;
  return 0;
}