public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
if(t1==null){
return t2;
}
if(t2==null){
return t1;
}
TreeNode root=new TreeNode(t1.val+t2.val);
root.left=mergeTrees(t1.left,t2.left);
root.right=mergeTrees(t1.right,t2.right);
return root;
}
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