/**
 * struct TreeNode {
 *	int val;
 *	struct TreeNode *left;
 *	struct TreeNode *right;
 * };
 */
/*
采用递归,如何是使用递归呢?
*/
class Solution {
public:
    /**
     * 
     * @param root1 TreeNode类 
     * @param root2 TreeNode类 
     * @return bool布尔型
     */
    bool isContains(TreeNode* root1, TreeNode* root2) {
        if (!root1) {
            return false;
        }
        return isContains(root1->left, root2) || isContains(root1->right, root2) || isSubTree(root1, root2);
    }
    bool isSubTree(TreeNode* root1, TreeNode* root2) {
        if (!root1 && !root2) {
            return true;
        }
        if (!root1 || !root2 || root1->val != root2->val) {
            return false;
        }
        return isSubTree(root1->left, root2->left) && isSubTree(root1->right, root2->right);
    }
};