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Tag: breadth-first-search

Time Limit Exceed for BFS algorithm

It is leetcode #200, number of islands. My code is It works fine. But when I change the bfs function into It gives me the Time Limit Exceeded error, what could the reasons be? I think these two codes are nearly identical? Answer You are visiting the same state many times: Change to the following:

BFS algorithm in Python

Guys! Can someone help me with this bfs code? I can’t understand how to solve this queue line. Answer To extend your queue with all nodes not yet seen on the path, use set operations: or use a generator expression: Lists don’t support subtraction. You don’t really need to filter the nodes, however, your code would work with a simple:

How to trace the path in a Breadth-First Search?

How do you trace the path of a Breadth-First Search, such that in the following example: If searching for key 11, return the shortest list connecting 1 to 11. Answer You should have look at http://en.wikipedia.org/wiki/Breadth-first_search first. Below is a quick implementation, in which I used a list of list to represent the queue of paths. This prints: [‘1’, ‘4’,

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