#### Route Between Nodes

This problem asks for the shortest route between two nodes in a graph. The input is a list of nodes and their connections. The output should be the shortest route between the two given nodes.

#### Problem

```Given a directed graph, design an algorithm to find out whether there is a route between two nodes.
Example input:
A -> B
A -> C
B -> D
C -> D
Example output:
Yes```

#### Solution

This solution is in C#. Our A.I. can create solutions in multiple languages.
```using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace InterviewQuestions.Ch1
{
public static class Q3RouteBetweenNodes
{
public static bool IsRouteBetweenNodes(GraphNode start, GraphNode end)
{
if (start == null || end == null)
return false;

if (start == end)
return true;

Queue<GraphNode> queue = new Queue<GraphNode>();
queue.Enqueue(start);

while (queue.Count > 0)
{
GraphNode node = queue.Dequeue();
node.Visited = true;

foreach (GraphNode child in node.Children)
{
if (child == end)
return true;

if (!child.Visited)
queue.Enqueue(child);
}
}

return false;
}
}
}```

A.I. Evaluation of the Solution

The candidate's solution correctly implements a breadth-first search to find a route between two nodes in a graph. The solution is complete and correctly handles edge cases such as null input values.

Evaluated at: 2022-12-07 08:15:47