// Runtime 0 ms Beats 100.00% of users with Java

// Memory 36.22 MB Beats 100.00% of users with Java

// Recursion.

// T:O(n), S:O(1)

//

class Solution {

public boolean isSameTree(TreeNode p, TreeNode q) {

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

return true;

}

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

return false;

}

if (p.val != q.val) {

return false;

}

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

}

}