adjmatt.cpp

#include <iostream>
using namespace std;

class graph{
   //int v,e;
   int vertices;
   int** adjmat;
   public:
   graph(int v,int e){
     if(v<=0){
        cout<<"invalid"<<endl;
        vertices=0;
        adjmat=nullptr;
        return;
     }
     vertices=v;
     adjmat = new int*[v];
     for(int i=0;i<v;i++){
        adjmat[i]=new int[v];
        for(int j=0;j<v;j++){
            adjmat[i][j]=0;
        }
     }
     cout<<"input"<<endl;
     int u,ver;
     for(int i=0;i<e;i++){
        cout<<i<<endl;

        cin>>u>>ver;

        if(u<0 || u>=v || ver<0 || ver>=v){
            cout<<"invalid"<<endl;
            i--;
            continue;
        }
        adjmat[u][ver]=1;
        adjmat[ver][u]=1;

     }
    }

     ~graph(){
      if(vertices>0 && adjmat) {
        for(int i=0;i<vertices;i++){
            delete[] adjmat[i];
        }
        delete[] adjmat;
       }
     }
    
     void display(){
        if(vertices<=0) return;
        cout<<"display"<<endl;
        for(int i=0;i<vertices;i++){
            for(int j=0;j<vertices;j++){
               cout<<adjmat[i][j]<<" ";

            }
            cout<<endl;
        }
     }

    
};

int main(){
    int v,e;
    cout<<"v,e"<<endl;
    cin>>v>>e;
    
    graph ob(v,e);
    ob.display();
    return 0;
}