Find the shortest route using Bellman’s principle.

Bellman's principle of optimality is a key concept in dynamic programming used to solve shortest path problems. One popular algorithm based on this principle is the Bellman-Ford algorithm. This algorithm can find the shortest path from a source node to all other nodes in a weighted graph, even in the presence of negative weight edges, provided there are no negative weight cycles.

Here's a Python implementation of the Bellman-Ford algorithm:

```python
class Graph:
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