Another problem of minimality also remains unsolved—to wit, what is the smallest number of digits a puzzle maker can place in a starting grid and still guarantee a unique solution?
另外还有一类「极
」的问题也还没有解决：在保证有唯一解的条件下，一个初盘
少需要几个数字？
(性)Another problem of minimality also remains unsolved—to wit, what is the smallest number of digits a puzzle maker can place in a starting grid and still guarantee a unique solution?
另外还有一类「极」的问题也还没有解决：在保证有唯一解的条件下，一个初盘少需要几个数字？
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