[LeetCode]Valid Sudoku解题记录

这道题考查对二维数组的处理，哈希表。

1.最自然的方法就是分别看每个数是否符合三个规则，所以就需要相应的数据结构来

记录这些信息，判定是否存在，显然最先想到用哈希表。

2.学会把问题抽象成一个个的子问题。

3.在索引的构建上下工夫。

4.底层数组如何对应的细节没有那么重要，重要的是构成了问题的全集。

代码：这里

附图：一趟遍历时根据i,j，对应到具体的grid，这里的构造模式有多种（？？）

时间： 2024-10-12 10:53:23

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