Plato (left) imagined humans were once whole, with four arms, four legs and two faces, before Zeus (right) split them, leaving each half searching for its other
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。关于这个话题，Line官方版本下载提供了深入分析
– facial features and expression。业内人士推荐WPS官方版本下载作为进阶阅读
// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined