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  • Understanding Time complexity calculation for Dijkstra Algorithm
    As per my understanding, I have calculated time complexity of Dijkstra Algorithm as big-O notation using adjacency list given below It didn't come out as it was supposed to and that led me to unde
  • Why doesnt Dijkstras algorithm work for negative weight edges?
    Can somebody tell me why Dijkstra's algorithm for single source shortest path assumes that the edges must be non-negative I am talking about only edges not the negative weight cycles
  • Negative weights using Dijkstras Algorithm - Stack Overflow
    Variants of Dijkstra's Algorithm The key is there are 3 kinds of implementation of Dijkstra's algorithm, but all the answers under this question ignore the differences among these variants Using a nested for -loop to relax vertices This is the easiest way to implement Dijkstra's algorithm The time complexity is O (V^2)
  • Difference between Prims and Dijkstras algorithms?
    What is the exact difference between Dijkstra's and Prim's algorithms? I know Prim's will give a MST but the tree generated by Dijkstra will also be a MST Then what is the exact difference?
  • Dijkstras algorithm in python - Stack Overflow
    I am trying to implement Dijkstra's algorithm in python using arrays This is my implementation
  • Does dijkstras algorithm relax the edges of the shortest path in order . . .
    He claims that Dijkstra's algorithm relaxes the edges of every shortest path in the graph in the order in which they appear on the path, and therefore the path-relaxation property applies to every vertex reachable from the source
  • algorithm - Bellman-Ford vs Dijkstra: Under what circumstances is . . .
    76 After a lot of Googling, I've found that most sources say that the Dijkstra algorithm is "more efficient" than the Bellman-Ford algorithm But under what circumstances is the Bellman-Ford algorithm better than the Dijkstra algorithm? I know "better" is a broad statement, so specifically I mean in terms of speed and also space if that applies
  • C++ - what data structures for Dijkstras should I use?
    To implement Dijkstra's: You need a priority queue (aka sorted list) and a set (which could be implemented as a list) The priority queue that keeps the current boundary and you pick the next item to be processed as the item in the queue with the shortest path (so the priority is distance to city) You need a set to keep track of the cities you have already reached The algorithm needs a way
  • Difference and advantages between dijkstra A star
    It says A* is faster than using dijkstra and uses best-first-search to speed things up A* is basically an informed variation of Dijkstra A* is considered a "best first search" because it greedily chooses which vertex to explore next, according to the value of f(v) [f(v) = h(v) + g(v)] - where h is the heuristic and g is the cost so far Note that if you use a non informative heuristic
  • Why is the time complexity of Dijkstra O ( (V + E) logV)
    I was reading about worst case time complexity for the Dijkstra algorithm using binary heap (the graph being represented as adjacency list) According to Wikipedia and various stackoverflow questions, this is O((V + E) logV) where E - number of edges, V - number of vertices





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