判断一颗二叉树是否镜像对称

1
/ \
2   2
/ \ / \
3  4 4  3

1
/ \
2   2
\   \
3    3

bool isSymmetric(TreeNode *Left,TreeNode *Right)
{
if(!Left&&!Right)
return true;
if(!Left||!Right)
return false;

if(Left->val==Right->val)
return isSymmetric(Left->left,Right->right)&&isSymmetric(Left->right,Right->left);
return false;
}

bool isSymmetric(TreeNode *root)
{
if(!root)
return true;
return isSymmetric(root->left,root->right);
}