/* struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ class Solution { public: // void InOrder(TreeNode* root,TreeNode*& prev) { if(root == nullptr) return; InOrder(root->left,prev); root->...
黑猫aaa：我觉得不学c++可能好一点