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class Solution {

public boolean isSymmetric(TreeNode root) {

if(root==null)

{

return true;

}

if(root.left==null&&root.right==null)

{

return true;

}

if(root.left==null||root.right==null)

{

return false;

}

return find(root.left,root.right);

}

public boolean find(TreeNode p,TreeNode q)

{

if(p==null&&q==null)

{

return true;

}

if(p==null||q==null)

{

return false;

}

if(p.val==q.val)

{

return find(p.left,q.right)&&find(p.right,q.left);

}

else

{

return false;

}

}

}