DECLRMM might work for us - it is approximately what we’re doing by deleting a character on each line when moving horizontally - but it has extremely poor terminal support so I didn’t want to rely on it.
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These exist in confusables.txt because they map to the same abstract character under NFKC decomposition. The map is semantically correct. But from a visual perspective, these are false positives: a human would never confuse Mathematical Fraktur l with plain l.，更多细节参见爱思助手下载最新版本
// 易错点1：条件写反（比如写成cur）→ 栈逻辑完全错误，无法找到上一个更大值。业内人士推荐搜狗输入法2026作为进阶阅读