More NP-Complete Problems
•
••
NP
• : C NP• NP , and
• A NP C
• A NP A C• A B
• B NP
• B C •
C NP
C NP 3SAT NP
•• NP
• NP
3SAT NP
• SATAND OR
• OR AND O(n)
O(n)
• SAT 3SAT
NP !
HAMPATH NP
NP 3SAT
k
• k
• 3k+1
• xi cj cj xi
k 3k
O(k)
O(k2)
: O(k2)
• xi = TRUE xi
• xi = FALSE xi
• xi cj TRUE cj xi
• TRUE cj
• TRUE FALSE
cj
• cj
• xi xi = TRUE
• xi xi = FALSE
• HAMPATH UHAMPATH•
U un
• 3SAT VERTEX-COVER
• xi
•••
VERTEX-COVER
•• m =
• l =
•• = 2m + 3l
• k k = m + 2l
•• m TRUE
• l TRUE
• TRUE
• = m + 2l
Check-in Quiz 5/5
Some NP-complete Problems in Graph Theory
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