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2010


1 G r G ֡ r G 1 G 2 G ڧ 2 I O I O 15 1 A. IOIIOIOO B. IOOIOIIO C. IIIOIOIO D. IIIOOIOO 21է true falseا 3 r[1..n] ۡ d[1..n]: d r[l] d[1] r[2] ա 4ܧ n=1 ܧ [ n=m-1 n=m S1 S2 ? Sm, P1,P2,? Pm Pm Pm Si(1 im) Si S1S2 ?Si-1 Si+1,Si+2, ?,Sm i=1 S1 m-1, {S2S3?Sm} {P1P2?Pm-1} i=m, Sm m-1 {S1 S2 ? Sm-1} {P1P2?Pm-1} 1<i<m Si {S1 S2?Si-1} {Si+1,Si+2,?Sm} {P1,P2,?,Pi-1}{Pi,Pi+1,? Pm-1} {S1 S2? Si-1}{P1P2?Pi-1} {Si+1,Si+2,? Sm} {Pi,Pi+1,?Pm-1} 5ߦ int LeafKlevel(BiTree bt, int k) // bt k(k>1) {if(bt==null || k<1) return(0); BiTree p=bt,Q[]; //Q , int front=0,rear=1,leaf=0; //front rear , leaf int last=1,level=1; Q[1]=p; //last level while(front<=rear) {p=Q[++front]; if(level==k && !p->lchild && !p->rchild) leaf++; // if(p->lchild) Q[++rear]=p->lchild; //

if(p->rchild) Q[++rear]=p->rchild; if(front==last) {level++; last=rear; } if(level>k) return (leaf); }//while 6 }// LeafKLevel G=(V,E)

//

//, 1 //last // k

V={V1,V2,V3,V4,V5,V6,V7}



E={<V1,V2>,<V1,V3>,<V1,V4>,<V2,V5>,<V3,V5>,<V3,V6>,<V4,V6>,<V5,V7>,<V6,V7>} G G V1 V2V4 V3V5 V6V7


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