
二叉搜索树是空树或具有以下属性的二叉树: 如果其左子树不为空二叉排序树 构造,则左子树上所有节点的值小于其根的值节点;如果其右子树不为空,则右子树上所有节点的值大于其根节点的值;它的左和右子树也是二叉搜索树. (摘自百度百科)
给出一系列不相等的整数,将它们插入最初为空的二进制搜索树中,然后描述结果树的结构. 您需要能够判断给定的描述是否正确. 例如,插入{2 4 1 3 0}以获取二叉搜索树后,语句语句为“ 2是树的根”,“ 1和4是同级节点”,“ 3和0在同一位置”级别”(从上到下指的是相同深度),“ 2是4的父节点”,“ 3是4的左子节点”是正确的;和“ 4是2的左孩子”,“ 1和3是兄弟”“节点”都是不正确的.

输入格式:
第一行的输入给出一个正整数N(<= 100),下一行给出N个不同的整数,以空格分隔二叉排序树 构造,要求将它们插入最初为空的Binary搜索树的树中. 然后给出一个正整数M(<= 100),后跟M行,每行给出一个要判断的陈述性句子. 陈述性句子有6种:

该问题确保所有给定的整数都在整数范围内.
输出格式:

对于每个语句,如果正确,则输出“是”,否则输出“否”,每个句子仅占一行.
输入示例:

5 2 4 1 3 0 8 2 is the root 1 and 4 are siblings 3 and 0 are on the same level 2 is the parent of 4 3 is the left child of 4 1 is the right child of 2 4 and 0 are on the same level 100 is the right child of 3
样本输出:
Yes Yes Yes Yes Yes No No No
建树过程中记录每个点高度,以及每个点指向的结点,方便查询。
#include <bits/stdc++.h> using namespace std; struct tree { tree *left, *right, *f; int height,data; }*root; int n,d,k,a,b; map<int,tree *> q; map<int,int>o; tree *creat(int d) { tree *p = new tree(); p->left = NULL; p->right = NULL; p->f = NULL; p->height = 0; p->data = d; q[d] = p; o[d] = 1; return p; } void insert_(tree *root,tree *t) { if(t->data > root->data) { if(root -> right == NULL)root -> right = t,t -> f = root,t-> height = root -> height + 1; else insert_(root -> right,t); } else { if(root -> left == NULL)root -> left = t,t -> f = root,t-> height = root -> height + 1; else insert_(root -> left,t); } } int main() { cin>>n; if(n) { cin>>d; root = creat(d); } for(int i = 1;i < n;i ++) { cin>>d; tree *p = creat(d); insert_(root,p); } cin>>k; for(int i = 0;i < k;i ++) { cin>>a; string op; cin>>op; if(op == "is") { cin>>op>>op; if(op == "root") { if(o[a] && root == q[a])cout<<"Yes"<<endl; else cout<<"No"<<endl; } else if(op == "parent") { cin>>op>>b; if(o[a] && o[b] && q[b] -> f == q[a])cout<<"Yes"<<endl; else cout<<"No"<<endl; } else if(op == "left") { cin>>op>>op>>b; if(o[a] && o[b] && q[b] -> left == q[a])cout<<"Yes"<<endl; else cout<<"No"<<endl; } else { cin>>op>>op>>b; if(o[a] && o[b] && q[b] -> right == q[a])cout<<"Yes"<<endl; else cout<<"No"<<endl; } } else { cin>>b>>op>>op; if(op == "on") { cin>>op>>op>>op; if(o[a] && o[b] && q[a] -> height == q[b] -> height) { cout<<"Yes"<<endl; } else cout<<"No"<<endl; } else { if(o[a] && o[b] && q[a] -> f == q[b] -> f)cout<<"Yes"<<endl; else cout<<"No"<<endl; } } } }
建立一个数组.
代码:
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