在 C++ 中找到具有父指针的二叉树的右兄弟
在本文的问题中,我们给定了一个二叉树和父指针。我们的任务是找到具有父指针的二叉树的右兄弟。
让我们举个例子来理解这个问题,
输入
Node = 3
输出
7
解决方案方法
解决该问题的简单方法是找到与当前节点(既不是当前节点也不是当前节点的父节点)处于同一级别的最近祖先的叶节点。这是通过向上计数来完成的,然后在向下计数时再进行计数。然后找到节点。
说明我们解决方案工作原理的程序,
示例
#include <bits/stdc++.h> using namespace std; struct Node { int data; Node *left, *right, *parent; }; Node* newNode(int item, Node* parent) { Node* temp = new Node; temp->data = item; temp->left = temp->right = NULL; temp->parent = parent; return temp; } Node* findRightSiblingNodeBT(Node* node, int level) { if (node == NULL || node->parent == NULL) return NULL; while (node->parent->right == node || (node->parent->right == NULL && node->parent->left == node)) { if (node->parent == NULL || node->parent->parent == NULL) return NULL; node = node->parent; level++; } node = node->parent->right; if (node == NULL) return NULL; while (level > 0) { if (node->left != NULL) node = node->left; else if (node->right != NULL) node = node->right; else break; level--; } if (level == 0) return node; return findRightSiblingNodeBT(node, level); } int main(){ Node* root = newNode(4, NULL); root->left = newNode(2, root); root->right = newNode(5, root); root->left->left = newNode(1, root->left); root->left->left->left = newNode(9, root->left->left); root->left->left->left->left = newNode(3, root->left->left->left); root->right->right = newNode(8, root->right); root->right->right->right = newNode(0, root->right->right); root->right->right->right->right = newNode(7, root->right->right->right); Node * currentNode = root->left->left->left->left; cout<<"The current node is "<<currentNode->data<<endl; Node* rightSibling = findRightSiblingNodeBT(currentNode, 0); if (rightSibling) cout<<"The right sibling of the current node is "<<rightSibling->data; else cout<<"No right siblings found!"; return 0; }
输出
The current node is 3 The right sibling of the current node is 7
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