leetcode #144 in cpp
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Given a binary tree, return the preorder traversal of its nodes' values.
For example:
Given binary tree {1,#,2,3},
1 \ 2 / 3
return [1,2,3].
Note: Recursive solution is trivial, could you do it iteratively?
Code:
/** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public: vector<int> preorderTraversal(TreeNode* root) { vector<int> res; stack<TreeNode*> stk; if(root) stk.push(root); TreeNode*cur; while(!stk.empty()){ cur = stk.top(); stk.pop(); res.push_back(cur->val); if(cur->right) stk.push(cur->right); if(cur->left) stk.push(cur->left); } return res; }}; 0 0
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