#### Route between two nodes in a directed graph

This technical problem deals with finding a route between two nodes in a directed graph. An example input is given, as well as the desired output.

#### Problem

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

#### Solution

This solution is in C++. Our A.I. can create solutions in multiple languages.
by kayakane
```#include <iostream>
#include <vector>
#include <queue>

using namespace std;

class Node {
public:
Node(int val) : val(val) {}
int val;
vector<Node*> children;
};

bool isRoute(Node* start, Node* end) {
if (start == end) return true;
queue<Node*> q;
q.push(start);
while (!q.empty()) {
Node* curr = q.front();
q.pop();
for (Node* child : curr->children) {
if (child == end) return true;
q.push(child);
}
}
return false;
}

int main() {
Node* a = new Node(1);
Node* b = new Node(2);
Node* c = new Node(3);
Node* d = new Node(4);
a->children.push_back(b);
b->children. push_back(c);
c->children.push_back(d);
cout << isRoute(a, d) << endl;
cout << isRoute(a, c) << endl;
cout << isRoute(a, a) << endl;
cout << isRoute(a, b) << endl;
cout << isRoute(d, a) << endl;
return 0;
}```

A.I. Evaluation of the Solution

The candidate's solution is correct and demonstrates a level of completeness. The candidate has correctly implemented a breadth-first search algorithm to find whether there is a route between two nodes in a directed graph.

Evaluated at: 2022-12-11 12:15:32