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未填入的數字輸入0, 然後慢慢+1來驗證, 如果超過9就設為0 從上一個堆疊開始算
http://oddest.nc.hcc.edu.tw/su304.htm
LeetCode
Problem: https://leetcode.com/problems/valid-sudoku/description/
C++ simple solution: https://leetcode.com/problems/valid-sudoku/discuss/15626/
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