directed undirected graph

#include<bits/stdc++.h>
using namespace std;
#define suni ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define pb push_back
#define F first
#define S second
#define endl "\n"
//undirected
const int mx=1e5+10;
vector<int> adjm[mx];
int main()
{
    suni;
    int n,m;
    cin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int u,v;
        cin>>u>>v;
        adjm[u].pb(v);
        adjm[v].pb(u);
    }
    for(int i=1; i<=n; i++)
    {
       cout<<i<<" ";
        for(auto u : adjm[i]) cout<<u<<" ";
        cout<<endl;
    }
}

//directed
/*const int mx=1e5+10;
vector<int> adjm[mx];
int main()
{
    suni;
    int n,m;
    cin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int u,v;
        cin>>u>>v;
        adjm[u].pb(v);
        adjm[v].pb(u); //undirected;
    }
    for(int i=1; i<=n; i++)
    {
       cout<<i<<" ";
        for(auto u : adjm[i]) cout<<u<<" ";
        cout<<endl;
    }
}*/