G= (X, E)KX
X
d(x, y) = (1{x, y} ∈ E,
2
k
k d n S k
φ(S)<2φ∗P = NP
E=
{1,2, . . . , n} F F1, F2, . . . , FmE
E i k
FiFi, i ∈I
Si∈IFi=E
Fixi
n0≤xi≤1
E={1,2,3,4,5}F1={1,3,5}, F2={2,3,4}, F3=
{1,2}, F4={4,5}, F5={1,2,4}, F6={3,5}
ˆx1,ˆx2,...,ˆxm
ˆx1,ˆx2,...,ˆxm
ˆx1,ˆx2,...,ˆxmi∈Iˆxi
ˆx1,ˆx2,...,ˆxmj
Fj1, Fj2, . . . , FjkFii∈I
j Fi, i ∈I1−1
e
mlog(n)O(log n)
1
2