c340s01f - CSc 340 Final Examination Monday 14 May 2001...

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CSc 340 Final Examination Monday 14 May 2001 SUGGESTED ANSWERS 1. Below I give the adjacency matrix of a weighted, undirected graph. The nodes are a, b, c, d, . .., m. If there is no arc between two nodes, nothing is shown. If there is an arc between two nodes I list the weight of the arc. Note: Because the graph is undirected the matrix (should be) is symmetric. a b c d e f g h i j k l m a 1 3 4 4 b 1 2 4 5 c 2 3 3 2 d 3 4 2 4 e 4 1 1 5 f 1 1 1 5 g 1 1 1 1 h 3 1 1 3 i 4 4 4 j 3 2 2 k 1 1 4 l 1 1 2 m 4 5 2 4 5 5 1 3 4 2 4 2 Show each step as you use Prim's algorithm for finding a MINIMUM spanning tree for the graph of the above adjacency matrix. Tree Fringe(node,wt) a b(a,1),h(a,3),i(a,4),m(a,4) ab c(b,2),h(a,3),i(a,4),m(a,4) ab,bc m(c,2),h(a,3),d(c,3),j(c,3),i(a,4) ab,bc,cm g(m,1),j(m,2),l(m,2),h(a,3),d(c,3),i(a,4),k(m,4),e(m,5),
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f(m,5) ab,bc,cm,mg f(g,1),h(g,1),l(g,1),j(m,2),d(c,3),i(a,4),k(m,4),e(m,5) ab,bc,cm,mg h(g,1),l(g,1),k(f,1),e(f,1),j(m,2),d(c,3),i(a,4) gf ab,bc,cm,mg l(g,1),k(f,1),e(f,1),j(m,2),d(c,3),i(a,4) gf,gh ab,bc,cm,mg k(f,1),e(f,1),j(m,2),d(c,3),i(a,4) gf,gh,gl ab,bc,cm,mg e(f,1),j(m,2),d(c,3),i(a,4) gf,gh,gl,fk ab,bc,cm,mg j(m,2),d(c,3),i(a,4) gf,gh,gl,fk, fe ab,bc,cm,mg d(j,2),i(a,4) gf,gh,gl,fk, fe,mj ab,bc,cm,mg i(a,4) gf,gh,gl,fk, fe,mj,jd ab,bc,cm,mg wt of tree is sum of wts of the nodes to the left gf,gh,gl,fk, = 1 + 2 + 2 + 1 + fe,mj,jd,ai 1 + 1 + 1 + 1 + 1 + 2 + 2 + 4 = 19 2. Show each step as you use Kruskal's algorithm for finding a MAXIMUM spanning tree for the graph of the adjacency matrix in problem 1. Set of Edge Sets Edge Q (wt) a b c d e f g h i j k l m bm(5),em(5),fm(5),ai(4),am(4),bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) a bm c d e f g h i j k l em(5),fm(5),ai(4),am(4),bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3),
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bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) a bm,me c d f g h i j k l fm(5),ai(4),am(4),bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) a bm,me,mf c d g h i j k l ai(4),am(4),bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) ai bm,me,mf c d g h j k l am(4),bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) ai,am,bm,me,mf c d g h j k l bi(4),de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) ai,am,bm,me,mf c d g h j k l de(4), dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1) ai,am,bm,me,mf,ed c g h j k l dm(4),im(4),km(4),ah(3),cd(3),cj(3),hm(3), bc(2),cm(2),dj(2),jm(2),lm(2),ab(1),ef(1), ek(1),fg(1),fk(1),gh(1),gl(1),gm(1),hl(1)
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c340s01f - CSc 340 Final Examination Monday 14 May 2001...

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