Completed LeetCode problem #37 - Sudoku Solver
https://leetcode.com/problems/sudoku-solver/description/
Took a day to fix an bug but not too bad.
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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