杀手数独中的内格和外格是什么?
最后更新
内格和外格是你在应用45法则时针对的特定单元格。理解它们是在陷入困境和找到解锁谜题其余部分的自由数字之间的区别。
定义 Innies 和 Outies
考虑一个3×3宫。任何所有单元格都在宫内的笼完全贡献于宫总和。一个有些单元格在宫内有些在宫外的笼是交叉笼。
交叉笼中位于宫内的单元格是内。位于宫外的单元格是外。
使用 Innies
Sum all cage sums fully inside the unit. Subtract from 45. The result is the total of all innie cells. If there is only one innie, you have its exact value - Place it. If there are two innies summing to, say, 11, their candidates are restricted to pairs summing to 11: {2,9}, {3,8}, {4,7}, {5,6}.
使用 Outies
Outies are handled symmetrically from the cage's perspective. A crossing cage has a known total. Subtract the values of the cells inside the unit (once known) from the cage total to find the sum of the cells outside - The outies. In the early game, outie logic becomes useful after innies have been partially resolved.
实用技巧
- 在每道谜题开始时,扫描所有27个单元(9行、9列、9宫)以寻找45规则的机会。
- 在简单谜题中,宫通常最容易产生单单元格内格;较难的谜题需要行和列的应用。
- 在纸上,用不同颜色圈出跨笼单元格,以追踪哪些单元格是内格还是完全贡献者。
内化这个最快的方法是在棋盘上—— 在线玩杀手数独 并在实时谜题上应用它。