u=Q.pop()ifuinS:continueS.add(u)forvinG[u]: Q.add(v)yielduclassstack(list): add=list.append g=list(traverse(G,0,stack)) 基于深度优先搜索的拓扑排序 defdfs_topsort(G): S,res=set(),[] defrecurse(u):ifuinS:returnS.add(u)forvinG[u]: recurse(v) res.append(u) foruinG: recurse(...
val = value def inorder(root): stack = deque() curr = root while stack or curr: if curr: stack.append(curr) curr = curr.left else: curr = stack.pop() print(curr.val) curr = curr.right root = Node(1) root.left = Node(2) root.right = Node(3) root.left.left = Node(4) ...
模拟的栈 stack 需要记录树高 O(h) 个待处理的结点,最差情况下,全部 O(n) 个结点在一条链上 代码(Python3) # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right ...
用python实现深度优先算法只需要在广度的基础上将搜索队列改为搜索栈即可: fromcollectionsimportdequefromcollectionsimportnamedtupledefbfs(start_node,end_node,graph):#开始节点,目标节点,图字典node=namedtuple('node','name, from_node')#使用namedtuple定义节点,用于存储前置节点search_stack=deque()#使用双端队列,...
template <typename E, typename N> void Graph<E, N>::IterativeDFS(Node n) { Stack<Node> stack; stack.Push(n); while(!stack.IsEmpty()) { Node u = stack.Read(); stack.Pop(); if(!IsMarked(u)) { std::cout << ReadNode(u) << " "; MarkVisited(u); NodeList adjnodes = Adjac...
1. 用迭代和stack。2. Morris Traversal Solution Python: Stack, Time: O(n), Space: O(h) # h is the height of the tree 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 classSolution2(object): defpostorderTraversal(self, root): ...
stack = [root,] while stack: node = stack.pop() stack.extend(node.children) res.append(node.val) return res[::-1] 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. C++代码如下: ...
If I understand correctly, this is the same as#33. I also used recursion but got stumped by the stack limit, so I have rewritten it to use the TreeCursor. Code found in#33 (comment). cedricrupbmentioned this issueFeb 25, 2022
We don't have to create the stack ourselves because recursion maintains the correct order for us. Python, Java and C/C++ Examples Python Java C C++ # Tree traversal in Python class Node: def __init__(self, item): self.left = None self.right = None self.val = item def inorder(root...
*/classSolution{public:vector<int>postorderTraversal(TreeNode*root){vector<int>v;if(NULL==root)returnv;stack<TreeNode*>s;s.push(root);TreeNode*pre=root;while(!s.empty()){TreeNode*cur=s.top();if((NULL==cur->left&&NULL==cur->right)||(pre==cur->left||pre==cur->right)){s.pop...