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Dijkstra’s Algorithm with simple buckets (also known as Dial’s algorithm)

15.082J & 6.855J & ESD.78J Visualizations . Dijkstra’s Algorithm with simple buckets (also known as Dial’s algorithm). ∞. ∞. 0. ∞. 1. ∞. ∞. ∞. 2. 0. 1. 2. 3. 4. 5. 6. 7. 3. 4. 5. 6. An Example. Initialize distance labels. 4. 2. 4. 2. 2. Initialize buckets. 2.

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Dijkstra’s Algorithm with simple buckets (also known as Dial’s algorithm)

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  1. 15.082J & 6.855J & ESD.78JVisualizations Dijkstra’s Algorithm with simple buckets (also known as Dial’s algorithm)

  2. ∞ ∞ 0 ∞ 1 ∞ ∞ ∞ 2 0 1 2 3 4 5 6 7 3 4 5 6 An Example Initialize distance labels 4 2 4 2 2 Initialize buckets. 2 1 3 1 6 4 2 3 Select the node with the minimum temporary distance label. 3 5 1

  3. 0 1 2 3 4 5 6 7 Update Step 2 ∞ ∞ 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ ∞ ∞ 4 2 3 4 5 1 6

  4. 0 1 2 3 4 5 6 7 Choose Minimum Temporary Label Find Min by starting at the leftmost bucket and scanning right till there is a non-empty bucket. 2 ∞ 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ ∞ 4 4 5 6 2 3

  5. 0 1 2 3 4 5 6 7 Update Step 6 2 ∞ 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ ∞ 4 4 3 4 5 6 2 3

  6. 0 1 2 3 4 5 6 7 Choose Minimum Temporary Label Find Min by starting at the leftmost bucket and scanning right till there is a non-empty bucket. 2 6 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ 3 4 6 3 5 4

  7. 0 1 2 3 4 5 6 7 Update 2 6 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ 3 4 6 3 5 4

  8. ∞ 0 1 2 3 4 5 6 7 Choose Minimum Temporary Label 2 6 4 2 4 2 2 0 2 1 3 ∞ 1 6 4 2 3 3 5 3 4 6 5 4

  9. 0 1 2 3 4 5 6 7 Update 2 6 4 2 4 2 2 0 6 2 1 3 ∞ 1 6 4 2 3 3 5 ∞ 3 4 6 5 4

  10. 0 1 2 3 4 5 6 7 Choose Minimum Temporary Label 2 6 4 2 4 2 2 0 2 1 3 6 1 6 4 2 3 3 5 3 4 4 6

  11. 0 1 2 3 4 5 6 7 Update 2 6 4 2 4 2 2 0 2 1 3 6 1 6 4 2 3 3 5 3 4 4 6

  12. 0 1 2 3 4 5 6 7 Choose Minimum Temporary Label 2 6 4 2 4 There is nothing to update 2 2 0 2 1 3 6 1 6 4 2 3 3 5 3 4 6

  13. End of Algorithm 2 6 4 2 4 2 2 0 2 1 3 6 1 6 4 2 3 3 5 3 4 All nodes are now permanent The predecessors form a tree The shortest path from node 1 to node 6 can be found by tracing back predecessors

  14. MITOpenCourseWare http://ocw.mit.edu 15.082J / 6.855J / ESD.78J Network Optimization Fall 2010 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.

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