adj matrix245

#include<iostream>
using namespace std;
int main()
{
    int v,a,b,k=1;
    cout<<"number of vertex: ";
    cin>>v;
    int m[v][v];
    for(int i=0;i<=v;i++)
    {
        for(int j=0;j<=v;j++)
        {
            m[i][j]=0;
        }
    }

    while(1)
    {
    cout<<"edge : "<<k<<endl;
    cin>>a>>b;
    if(a>v || b>v)
    {
        cout<<"please input valid input"<<endl;
    }
    else if(a==0 && b==0)
    {
        break;
    }
    else
    {
        m[a][b]=1;
        m[b][a]=1;
        k++;
    }
    }
     for(int i=1;i<=v;i++)
    {
        for(int j=1;j<=v;j++)
        {
            cout<<m[i][j]<<" ";
        }
        cout<<endl;
    }

}