Completed LeetCode question #98-Validate Binary Search Tree
https://leetcode.com/problems/validate-binary-search-tree/description/
Completed the LeetCode #2 adding two numbers
https://leetcode.com/problems/add-two-numbers/discuss/?page=72 But failing one of its test cases, tested the same test case locally but succeeded! So you cannot really believe the LeetCode online judge. After more digging, it turned out the test case they put together included value outside the range of the LONG data type, you have implemented addition without using the addition of integers!!!!!
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