(b)NS)F{y2,y3},NS)≠T,取y2∈N(S)-T G=(X,Y) (c)y为M非饱和点，加上y,和边x3y,生长树H。此时 置M=M△EP)={xy1,x2y3,x3y2} y4 G=(,Y) 100.8 1 0.6 0.4 0.2 0 x t 0 0.5 1 1.5 2 1 0.5 0 0.5 1 n 10 (b ) N(S)= ｛y2, y3｝,N(S)≠T, 取y2 ∈N(S)-T (c) y2为M非饱和点，加上y2和边x3y2生长树H。此时， 置M=MΔE(P)=｛x1y1, x2y3, x3y2｝ x1 x2 x3 x4 x5 y1 y2 y3 y4 y5 G=(X, Y) x3 y2 x1 x2 x3 x4 x5 y1 y2 y3 y4 y5 G=(X, Y)