leetcode:Binary Tree Inorder Traversal
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class Solution {public: vector<int> inorderTraversal(TreeNode *root) { vector<int> res; stack<TreeNode *> s; TreeNode * p = root; while(p!=NULL||!s.empty()) { while(p!=NULL) { s.push(p); p = p->left; } p = s.top(); res.push_back(p->val); s.pop(); p = p->right; } return res; }};
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