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25.java

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class Solution {

public TreeNode mirrorTree(TreeNode root) {

if(root==null)

{

return root;

}

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

{

return root;

}

find(root);

return root;

}

public void find(TreeNode p)

{

if(p==null)

{

return;

}

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

{

return;

}

TreeNode t = p.left;

p.left = p.right;

p.right = t;

find(p.left);

find(p.right);

}

}