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public class SameTree {

public boolean isSameTree(TreeNode p, TreeNode q) {

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

return true;

}

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

return false;

}

return p.val == q.val && isSameTree(p.left, q.left) && isSameTree(p.right, q.right);

}

}