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Lecture 18-cs648
1.
Randomized Algorithms CS648 Lecture 18 •
Approximate Distance Oracles • Algorithm for Min-cut : part 1 1
2.
APPROXIMATE DISTANCE ORACLES 2
3.
All-Pairs Shortest Paths 3
4.
All-Pairs Shortest Paths 4
5.
All-Pairs Approximate Shortest
Paths 5
6.
A truly magical
result Approximate Distance Oracles Space Query time Preprocessing time Mikkel Thorup and Uri Zwick: Approximate Distance Oracles for graphs, Journal of ACM (4), 2005 6
7.
INSPIRATION FROM OUR DAILY
LIFE 7
8.
Air/Road Network 8
9.
The Idea 9
10.
Formal notion of
locality 10
11.
Formal notion of
locality 11
12.
12
13.
What is the
stretch ? ?? 13
14.
3-approximate distance oracle Global
distance info. Local distance info. 14
15.
The real challenge
left 15
16.
The real challenge
left 16
17.
Conquering the challenge 17
18.
18
19.
Expected space of 3-approximate
distance oracle 19
20.
20
21.
5-APPROXIMATE DISTANCE ORACLE Meant
for only those (hopefully nonzero no. of) students whose aim is more than just a good grade in this course. 21
22.
3-approximate distance oracle 22
23.
5-approximate distance oracle 23
24.
5-approximate distance oracle 24
25.
PROBLEM 2 MIN-CUT 25
26.
Min-Cut 26
27.
Min-Cut 27
28.
SOME BASIC FACTS 28
29.
Min-Cut 29
30.
30
31.
31
32.
32
33.
33
34.
Algorithm for min-cut 34
35.
Algorithm for min-cut 35
36.
Algorithm for min-cut 36
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