105. Construct Binary Tree from Preorder and Inorder Traversal
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Given preorder and inorder traversal of a tree, construct the binary tree.
Note:
You may assume that duplicates do not exist in the tree.
方法一:迭代
1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 TreeNode* buildTree(vector<int>& preorder, vector<int>& inorder) { 13 if(preorder.size()==0) 14 return NULL; 15 stack<TreeNode*>s; 16 TreeNode*root,*t; 17 int flag=0,i=0,j=0; 18 root=new TreeNode(preorder[0]); 19 t=root; 20 s.push(root); 21 i++; 22 while(i<preorder.size()) 23 { 24 if(!s.empty()&&s.top()->val==inorder[j]) 25 { 26 t=s.top(); 27 s.pop(); 28 flag=1; 29 j++; 30 } 31 else 32 { 33 if(flag==0) 34 { 35 t->left=new TreeNode(preorder[i]); 36 t=t->left; 37 s.push(t); 38 i++; 39 } 40 else 41 { 42 flag=0; 43 t->right=new TreeNode(preorder[i]); 44 t=t->right; 45 s.push(t); 46 i++; 47 } 48 } 49 } 50 return root; 51 } 52 };
方法二:递归
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105. Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal
105.Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal