{ TreeNode*temp =treeStack.top(); result.push_back(temp->val); treeStack.pop();if(temp->right!=NULL) //先压入右子树,后压入左子树,只有非空的时候压入,这样处理后的根据栈的后进先出,自然就是先处理左子树,再处理右子树了 treeStack.push(temp->right);if(temp->left!=NULL) treeStack.push...
The.character does not represent a decimal point and is used to separate number sequences. For instance,2.5is not "two and a half" or "half way to version three", it is the fifth second-level revision of the second first-level revision. Here is an example of version numbers ordering: ...
Given a non-empty, singly linked list with head node head, return a middle node of linked list. If there are two middle nodes, return the second middle node. Example 1: Input: [1,2,3,4,5] Output: Node 3 from this list (Serialization: [3,4,5]) The returned node has value 3....
【leetcode】 Unique Binary Search Trees (middle)☆ Givenn, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Givenn= 3, there are a total of 5 unique BST's. 13321\/ / /\ \321132/ /\ \2123 1. 2. 3. 4. 5. 思路:因为是奔着动态...
stack.c vector.c developer_tools dynamic_programming exercism games geometry graphics greedy_approach hash leetcode machine_learning math misc numerical_methods process_scheduling_algorithms project_euler scripts searching sorting .clang-format .clang-tidy .gitignore .gitpod.dockerfile .gitpod.yml CMakeLi...
当长度符合条件就压入答案,只有这时stack长度才会减小,其他长度下会压入新值。 vector<string> generateParenthesis2(intn) { vector<string>ans; vector<string>stack; vector<int>validationStack; stack.push_back("("); validationStack.push_back(0);while(stack.size() !=0) ...