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);
}
}