Chapter 9. From A to B with Edsger and Friends


The shortest distance between two points is under construction.

 --Noelie Altito

It's time to return to the second problem from the introduction:[123] how do you find the shortest route from Kashgar to Ningbo? If you pose this problem to any map software, you'd probably get the answer in less than a second. By now, this probably seems less mysterious than it (maybe) did initially, and you even have tools that could help you write such a program. You know that BFS would find the shortest path if all stretches of road had the same length, and you could use the DAG shortest path algorithm as long as you didn't have any cycles in your graph. Sadly, the road map of China contains both cycles and roads ...

Get Python Algorithms: Mastering Basic Algorithms in the Python Language now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.