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Questions and Answers
What is the purpose of the path.unshift(current + 1)
statement in the given code?
What would happen if you replaced previous[current]
with next[current]
in the while loop?
In the context of this code, what does end
represent?
What is the significance of the return path.join('-');
statement in the code?
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What is the initial value of current
set to in the path reconstruction process?
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Study Notes
Reconstructing the Path
- The code snippet reconstructs the shortest path found using Dijkstra's algorithm.
- The
path
array will store the nodes in the path. -
current
is initialized to theend
node. - It iterates through the nodes in reverse order using a
while
loop until it reaches the starting node. - In each iteration, the current node's index is added to the beginning of the
path
array usingunshift
. - The
previous
array stores the predecessor of each node in the shortest path. - The
current
node is then set to its predecessor from theprevious
array. - The code then joins the nodes in the
path
array using a-
delimiter to form the final path string. - This functionality allows the code to determine and display the shortest path between two nodes in a graph based on Dijkstra's algorithm.
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Description
This quiz covers the code implementation for reconstructing the shortest path using Dijkstra's algorithm. It discusses the usage of arrays like path
and previous
to backtrack from the end
node to the start
node. Test your understanding of graph theory and how pathfinding algorithms operate.