__ Problem:-__

__ __ Given a directed Graph , Design an algorithm to find out whether there is a route between nodes.

__Code:-__

#include<bits/stdc++.h>

using namespace std;

vector<int> arr[100];

// function for checking there is any edges or not

int isedge(int a,int b)

{

for(int child:arr[b])

{

if(child==a)

return 1;

return isedge(a,child);

}

return 0;

}

//Driver program

int main()

{

int n,e;

cout<<"Enter the number of vertex and Edges"<<endl;

cin>>n>>e;

int a,b;

cout<<"Enter the "<<e<<"Edges"<<endl;

for(int i=0;i<n-1;i++)

{

cin>>a>>b;

arr[a].push_back(b);

}

cout<<"Enter the vertexes to check"<<endl;

cin>>a>>b;

if(isedge(b,a))

cout<<"There is an Edge between "<<a<<" and "<<b;

else

cout<<"There is no any Edge between "<<a<<" and "<<b;

return 0;

}

__Output:-__

Enter the number of vertex and Edges

5 6

Enter the 6 Edges

1 2

3 1

3 5

5 4

2 4

2 3

Enter the vertexes to check

2 4

There is an Edge between 2 and 4

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__Key points:-__

__ MCQs:-__