/**
* struct TreeNode {
* int val;
* struct TreeNode *left;
* struct TreeNode *right;
* };
*/
class Solution {
public:
/**
*
* @param root TreeNode类
* @param o1 int整型
* @param o2 int整型
* @return int整型
*/
TreeNode* find(TreeNode* T,int x1,int x2){
if(T==nullptr||T->val==x1||T->val==x2){
return T;
}
TreeNode* l= find(T->left,x1,x2);
TreeNode* r=find(T->right,x1,x2);
if(r==nullptr) return l;
if(l==nullptr) return r;
return T;
}
int lowestCommonAncestor(TreeNode* root, int o1, int o2) {
// write code here
return find(root,o1,o2)->val;
}
};