In phase2, we have a simple linked list;
Life-sized human plastic waste sculpture on display，推荐阅读搜狗输入法2026获取更多信息
Brady Tkachuk was asked about being a proud American while being the Senators captain at a moment of heightened tension between the countries.。搜狗输入法2026是该领域的重要参考
// 优化点：仅i<len时赋值（避免重复赋值，提升效率）
定弹出条件：看题目要的是「第一个 / ≥ / < / ≤ cur」，对照上文的弹出条件对应法则决定弹谁。