For devtool companies
需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。。夫子是该领域的重要参考
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Access 40+ use-cases。Line官方版本下载对此有专业解读
My earliest prototype used ascii characters for snakes and fruit. This had a problem - since terminal characters are twice as tall as they are wide, vertical movement felt much faster than horizontal movement: