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Leetcode#106 Construct Binary Tree from Inorder and Postorder Traversal

原题地址

 

二叉树基本操作

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代码:

 1 TreeNode *restore(vector<int> &inorder, vector<int> &postorder, int ip, int pp, int len) { 2   if (len == 0) 3     return NULL; 4  5   TreeNode *node = new TreeNode(postorder[pp + len - 1]); 6  7   if (len == 1) 8     return node; 9 10   int leftLen = 0;11   while (inorder[ip + leftLen] != postorder[pp + len - 1])12     leftLen++;13   node->left = restore(inorder, postorder, ip, pp, leftLen);14   node->right = restore(inorder, postorder, ip + leftLen + 1, pp + leftLen, len - leftLen - 1);15 16   return node;17 }18 19 TreeNode *buildTree(vector<int> &inorder, vector<int> &postorder) {20   return restore(inorder, postorder, 0, 0, inorder.size());21 }

 

Leetcode#106 Construct Binary Tree from Inorder and Postorder Traversal