k

k

A*

K

+

+ TGt

sidetracks(p)p

psidetracks(p)

lastsidestrack(p)Tt

D(G)

P(G)rkk

P(G)4kO(k log k)O(m + n log n + k log k)

ksO(m + n log n + k n log k)

kn log nk log k

O(m + n + k)!!!SGU 314, Shortest Paths http://acm.sgu.ru/problem.php?contest=0&problem=314[1] David Eppstein, Finding the k Shortest Paths, 1997

[2] 2003Thanks for listeningThe End