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需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
，更多细节参见51吃瓜
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三个别人帮忙拍的视频里，都能找到阿爸的身影，他始终站着，鲜少与人交谈。阿爸要么站在大人那桌旁，低头用那双像“鸡爪”的手滑着手机；要么双手背在身后，与人寒暄一两句，要么在小孩桌边站着，双手像多余似的挂在身前。阿妈说：“何止他手多余，整个人看起来都有点多余。”
If a player gets all four words in a set correct, those words are removed from the board. Guess wrong and it counts as a mistake — players get up to four mistakes until the game ends.