摘要：
struct TreeNode* lowestCommonAncestor(struct TreeNode* root, struct TreeNode* p, struct TreeNode* q) { if(root==p || root==q || !root) return root; st 阅读全文
摘要：
int recursion(struct TreeNode* root, int* k,int* ret){ if(!root || *k==0) return *ret; recursion(root->left,k,ret); if(--(*k)==0){ *ret = root->val; } 阅读全文