Adj Matrix

#include<bits/stdc++.h>
using namespace std;

void addEdge(vector<vector<int>> &adj, int u, int v)
{
    adj[u][v]=1;
    adj[v][u]=1;
}
void printGraph(vector<vector<int>> &adj, int V)
{
    for (int i = 0; i < V; ++i)
    {
        for(int j=0;j<V;j++)
            cout<<adj[i][j];
        cout<<endl;
    }
}
int main()
{
    int V = 5;
    vector<vector<int>> adj(V,vector<int>(V,0));
    addEdge(adj, 0, 1);
    addEdge(adj, 0, 4);
    addEdge(adj, 1, 2);
    addEdge(adj, 1, 3);
    addEdge(adj, 1, 4);
    addEdge(adj, 2, 3);
    addEdge(adj, 3, 4);
    printGraph(adj, V);
    return 0;
}