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# 行列区块摒除 | ||
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<!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
## 目录 | ||
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- [原理](#%E5%8E%9F%E7%90%86) | ||
- [标签](#%E6%A0%87%E7%AD%BE) | ||
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<!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
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## 原理 | ||
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因为: | ||
- 行列`RegionLineA`内 | ||
- 必然存在数字`X` | ||
- 所有可填写数字`X`的单元格,恰好**都**属于另一区域`ReginB` | ||
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所以: | ||
- 区域`ReginB`内 | ||
- 不属于`RegionLineA`的单元格 | ||
- 必不填入`X` | ||
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## 标签 | ||
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#Level/2 | ||
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> [SudokuWiki.org - Box Line Reduction](https://www.sudokuwiki.org/Intersection_Removal#LBR) |