G
n
a z
i := 1 n
L(vi) := ∞
L(a) := 0
S := ∅
w(vi, vj) = ∞ w(vi, vi) = 0
z /∈ S
u := S L(u)
S := S ∪ u
v S
L(u) + w(u, v) < L(v)
L(v) := L(u) + w(u, v)
S
S
O(n 2 ) n
G
n n
n − 1
n · (n − 1) + n = n 2 − n + n = n 2
O(n 2 )
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