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#include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; int a[1000],n; struct Tree { int s; Tree *L,*R; }*Root; Tree *Creat() { Tree *p; p=new Tree; p->L=NULL; p->R=NULL; } int KKK=0; int middle(Tree *root) { if(root!=NULL) { middle(root->L); if(KKK==0) KKK=1; else printf(" "); printf("%d",root->s); middle(root->R); } } void Build() { Tree *root; Root->s=a[0]; for(int i=1; i<n; i++) { root=Root; while(1) { if(a[i]<root->s) { if(root->L==NULL) { Tree *p; p=Creat(); p->s=a[i]; root->L=p; break; } else root=root->L; } else { if(root->R==NULL) { Tree *p; p=Creat(); p->s=a[i]; root->R=p; break; } else root=root->R; } } } } int main() { while(~scanf("%d",&n)) //又多定义了局部变量n { KKK=0; for(int i=0; i<n; i++) { scanf("%d",&a[i]); } Root=Creat(); Build(); middle(Root); printf("\n"); } }
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原文地址:http://blog.csdn.net/became_a_wolf/article/details/47726273