Questions tagged [dijkstra]

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I'm trying to understand why anyone would prefer Floyd-Warshal over Dijkstra: Dijkstra gives a correct result, using an understandable system, combined with backtracking. Floyd-Warshal makes an ...
• 1,910
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Did Dijkstra intend for code modularization, when he wrote about separation of concerns?

First, I read an excerpt Edsger W. Dijkstra's 1974 paper "On the role of scientific thought": Let me try to explain to you, what to my taste is characteristic for all intelligent thinking. It is, ...
• 8,217
1k views

Mixing heuristic functions in A*

I have applied a custom heuristic to my A* search. It is admissible, but it is not consistent (monotonic). As such, I am not guaranteed to find the shortest path. I had assumed I could use a hybrid ...
• 574
1 vote
192 views

Is my understanding of dijkstra and plain Breadth-First Search correct?

I need to help to validate whether my understanding of when to use Dijkstra and when BFS are correct. My way of understanding BFS and Dijkstra, when to use what, am I correct? As I see it. Being ...
• 113
1 vote
1k views

Find fastest connection to a certain point

What i'm trying to implement is a program that is searching for the fastest connection from one station to other at a given time of the day. I have a number of stations n, and a number m of lines ...
• 111
14k views

Algorithm to determine the fastest route passing in all points

Given a starting point A and an end point E, I need an algorithm to determine the minimum transit route in a city that passes through all points (A, B, C, D, E) and is the fastest possible. I know I ...
• 129
1 vote
94 views

Is there a way we can write a function for Dijkstra to determine which node to enqueue and which to discard. This is for a navigation solution for people with disabilities where path to stairs may be ...
• 113
1 vote
2k views

Why does this implementation of Dijkstra's algorithm work in O(n^2)?

Here is the code I use for implementing Dijkstra's algorithm. Consider a graph with n vertices and m edges. Shouldn't it run in O(n^2 m) ? Someone may say that there are n vertices and each edge gets ...
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Shortest Path Between Two Nodes in a +10 Million Nodes Graph

I have my own knowledge graph representation, read from ConceptNet and NELL, containing tens of millions of nodes in which I want to calculate the nearest distance (if any) between two concept nodes. ...
• 151