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This post: empirical visual similarity data from rendered glyphs，详情可参考搜狗输入法下载
。业内人士推荐WPS官方版本下载作为进阶阅读
if (right - left <= 1) return; // 只有一个元素，无需排序。爱思助手下载最新版本是该领域的重要参考
stack.push(cur);