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Recent questions tagged dijkstrasalgorithm
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Made Easy Workbook
Suppose that you are running Dijkstra’s algorithm on the edgeweighted diagram below, starting from vertex A. The Table gives ‘Distance’ and ‘Parent’ entry of each vertex after vertex E has been deleted from the priority queue and relaxed. Vertex Distance Parent A 0 Null B 2 A C 13 F D 23 A E 11 F F 7 B G 36 F H 19 E What could be the possible value of expression x+y?
asked
Mar 10
in
Algorithms
by
noob_coder
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657
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algorithms
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made easy
can anyone explain how dijkstras will behave as BFS whwn a graph is unweighted?
asked
Jan 26
in
Algorithms
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screddy1313
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481
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programminginc
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3
Dijkstra's Algorithm on negative weight cycle
Somebody please clarify me, will dijkstra’s algorithm terminate if there is a negative cycle present? (as far as I know, it doesn't give correct result as it keep updating the value, so in that logic it sould fall into infinite loop and wont terminate. Is this correct?)
asked
Jan 25
in
Algorithms
by
anisha007
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209
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123
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dijkstrasalgorithm
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4
#SELF DOUBT
Prove dijkstra’s algorithm using Heap is O((n+E)logn) where n is no.of vertices and E is number of edges? Book : Fundamentals of Computer Algorithms By sahni page : 263
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Nov 28, 2018
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Algorithms
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OneZero
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31
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dijkstrasalgorithm
timecomplexity
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5
Data Structure Decrease Key Extract Min
Why Decrease Key operation we do only on edges and Extract Min operation do only on vertices? (I mean why Decrease key cannot operate on both edges and vertices?)
asked
Oct 30, 2018
in
DS
by
srestha
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108
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dijkstrasalgorithm
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Massachusetts Institute of Technology Professors Ronald L. Rivest and Sivan Toledo
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Jul 30, 2018
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Algorithms
by
Rishav Kumar Singh
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124
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greedyalgorithm
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1
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7
Space Complexity of Dijkastra's algorithm
I read that the space complexity of Dijasktra is $O(V^2)$ . (http://igraph.wikidot.com/algorithmspacetimecomplexity) But how ????
asked
Jul 5, 2018
in
Algorithms
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Hardik Maheshwari
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93
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592
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dijkstrasalgorithm
shortestpath
spacecomplexity
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True/False
Which of the following statements related to graphs are True? Consider a graph with Positive distinct edges 1.If we add a Positive Integer to all edges, then there are chances to get more than one shortest paths between 2 vertices 2.If we add a Positive Integer ... 4.If we add a Negative Integer to all edges, then there are chances to get more than one longest paths between 2 vertices
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Jun 9, 2018
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Graph Theory
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Balaji Jegan
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93
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algorithms
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9
Made easy workbook
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Jun 2, 2018
in
Algorithms
by
anjali.it25
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19
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119
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dijkstrasalgorithm
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1
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Dijkstra Time Complexity using Binary Heap
Question Source  https://gateoverflow.in/1374/gate200538 Let G(V,E)be an undirected graph with positive edge weights. Dijkstra's single source shortest path algorithm can be implemented using the binary heap data structure with time complexity: 1. O(V2) 2. O( ... as I > said the correct answer is O((E+V)logV). So, where am I going > wrong?
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May 22, 2018
in
Algorithms
by
iarnav
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8.3k
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284
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11
Dijkstra's
asked
Jan 26, 2018
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Algorithms
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Pawan Kumar 2
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dijkstrasalgorithm
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12
Question
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Jan 10, 2018
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AnilGoudar
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13
Dijkstra’s algorithms
Consider a weighted, directed acyclic graph G = (V,E,w) in which edges that leave the source vertex s may have negative weights and all other edge weights are nonnegative. Does Dijkstra’s algorithm correctly compute the shortestpath weight δ(s,t) from s to every vertex t in this graph? Justify your answer
asked
Jan 3, 2018
in
Algorithms
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pranab ray
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779
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105
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algorithms
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+3
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2
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14
Dijkstra Algorithm
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Dec 5, 2017
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Parshu gate
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15
Dijkstra algorithm
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Nov 29, 2017
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Computer Networks
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Parshu gate
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305
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dijkstrasalgorithm
shortestpath
computernetworks
+3
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0
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16
Self Doubt ( Decrease key operation )
While going through dijkstra's algorithm, there is a term "decrease key". I am not getting the meaning when it says "we do decrease key operation". What exactly we do and what is the meaning of decrease key ?
asked
Oct 15, 2017
in
Algorithms
by
Hitoshi
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53
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527
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algorithms
dijkstrasalgorithm
graphtheory
+7
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0
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17
Dijkstra's
I know that Dijkstra's Doesn't work for Negative weight cycle because it form a loop, Does it also true that it may or may not work for negative weight edge(without cycle) ? If it is not working for a negative weight edge(without cycle) give some example to prove it.
asked
Oct 12, 2017
in
Algorithms
by
junaid ahmad
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8.5k
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630
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dijkstrasalgorithm
shortestpath
0
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3
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18
dijkstra
If we run Dijkstra’s algorithm to find single source shortest path for the above edge weighted directed graph with ‘8’ as source. In what order do the nodes get included into the set of vertices for which the shortest path distances are finalized.
asked
Sep 14, 2017
in
Algorithms
by
Warlock lord
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246
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dijkstrasalgorithm
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0
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0
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19
Algorithm
asked
Aug 18, 2017
in
Algorithms
by
Beyonder
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499
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61
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algorithms
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bfs
+1
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2
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20
confused somebody please tell this Dijkstra
asked
Apr 10, 2017
in
Computer Networks
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LavTheRawkstar
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115
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computernetworks
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21
#Totally Confused# please tell Using Dijkstra Algorithm solve shortest path algorithm from A to D.
asked
Apr 6, 2017
in
Computer Networks
by
LavTheRawkstar
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3.7k
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228
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algorithms
shortestpath
dijkstrasalgorithm
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22
MadeEasy Subject Test: Algorithms  Graph Algorithms
Which of the following statements is true? Adding a constant to every edge weight in a directed graph can change the set of edges that belongs to minimum cost spanning tree. Assume unique weights. Complete graph with 4 vertices, each edges ... ). None of these how is 3rd wrong? If there is no negative cycles dijkstra can work just fine right?
asked
Jan 20, 2017
in
Algorithms
by
Pankaj Joshi
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575
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madeeasytestseries
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0
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0
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23
Doubt
What is Dijkstra's algorithm running time using sorted array?
asked
Dec 20, 2016
in
Algorithms
by
Shreya Roy
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4.5k
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73
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dijkstrasalgorithm
+2
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1
answer
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Analysis of Dijikstra Algorithm
What will be the change is Time Complexity OF Dijikstra Algorithm If Following Data Structures are used ? Priority Queue : Binary Heap & Graph : Matrix Priority Queue : Binomial Heap & Graph : Adjacancy List Priority Queue : Fibonacci Heap & ... : AVL Tree & Graph : Adjacancy List How to find the change in timecomplexity if one is used over the other
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Dec 14, 2016
in
Algorithms
by
PEKKA
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415
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1
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25
MadeEasy Test Series: Algorithms  Graph Algorithms
asked
Dec 14, 2016
in
Algorithms
by
rahul sharma 5
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141
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madeeasytestseries
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0
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26
[Algrithms] Dijkstra Time complexity
From Wikipedia : the algorithm requires time in the worst case; for connected graphs this time bound can be simplified to 1. Can somebody explain how are we combing (V+E) into E in case of connected graph and why it can't be combined in case of disconnected graph? 2. What will be dijakstra behaviour for disconnected graph?
asked
Dec 11, 2016
in
Algorithms
by
rahul sharma 5
Boss
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25.3k
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218
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dijkstrasalgorithm
+4
votes
1
answer
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dijkstra
Which of the following statements is/are True? I.Consider a weighted directed graph G and let ‘P’ be a shortest path from u to v for u,v∈V. If we double the weight of every edge in the graph for each ‘e’ belongs to E, then P will still be a shortest path from u to v. II.The time complexity to detect negative weight cycles in an arbitrary directed graph is O(V+E).
asked
Nov 28, 2016
in
Algorithms
by
Shubham Pandey 2
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6.8k
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418
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dijkstrasalgorithm
0
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0
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28
dijkstra
Consider a Graph G which contains a negative weight edges but not negative cycles then which of the following statements is TRUE when we run Dijkstra's algorithm? It may not terminate It terminates but may produce incorrect results. Explanation: It always ... + e priority queue operations, but may produce incorrect results It never terminates due to cycles in graph None of these
asked
Nov 28, 2016
in
Algorithms
by
Shubham Pandey 2
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6.8k
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482
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dijkstrasalgorithm
+5
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1
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29
Dijkstra's algorithm
What is the time complexity of Dijkstra’s algorithm if it is implemented using AVL Tree instead of Priority Queue over a graph G = (V, E)?
asked
Nov 5, 2016
in
Algorithms
by
vaishali jhalani
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855
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algorithms
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graphalgorithms
shortestpath
+1
vote
1
answer
30
Dijkstra's Agorithm
When the graph contain negetive weight edges but no negetive weight cycle, in this case can dijkstra leads to incorrect result?
asked
Nov 4, 2016
in
Algorithms
by
vaishali jhalani
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4.7k
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333
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