习题链接：LeetCode 402. 移掉 K 位数字
低端机越来越少，中端机越来越难卖，高端机的市场固然在扩大，可门槛依旧很高，这种行业的加剧分化，可能让国产手机厂商上下探索的空间变得更小。往悲观的方向想，这会将整个行业拖入一个新的低谷。，更多细节参见WPS官方版本下载
Even though Typst is still on version number zero, as it has matured,，这一点在safew官方版本下载中也有详细论述
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Ben Harrison, Director of the Work Foundation at Lancaster University, said they show "the magnitude of the challenge facing young people and the government".