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43 lines
1.2 KiB
43 lines
1.2 KiB
/**
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* File: binary_tree_bfs.cpp
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* Created Time: 2022-11-25
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* Author: krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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/* Level-order traversal */
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vector<int> levelOrder(TreeNode *root) {
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// Initialize queue, add root node
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queue<TreeNode *> queue;
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queue.push(root);
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// Initialize a list to store the traversal sequence
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vector<int> vec;
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while (!queue.empty()) {
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TreeNode *node = queue.front();
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queue.pop(); // Queue dequeues
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vec.push_back(node->val); // Save node value
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if (node->left != nullptr)
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queue.push(node->left); // Left child node enqueues
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if (node->right != nullptr)
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queue.push(node->right); // Right child node enqueues
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}
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return vec;
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}
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/* Driver Code */
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int main() {
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/* Initialize binary tree */
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// Use a specific function to convert an array into a binary tree
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TreeNode *root = vectorToTree(vector<int>{1, 2, 3, 4, 5, 6, 7});
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cout << endl << "Initialize binary tree\n" << endl;
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printTree(root);
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/* Level-order traversal */
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vector<int> vec = levelOrder(root);
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cout << endl << "Sequence of nodes in level-order traversal = ";
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printVector(vec);
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return 0;
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}
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