There are few things sadder than the end of a close friendship. Whether it happens in a sudden moment of betrayal or after years of gradual separation, the feelings of loss can stay with you for a lifetime.
所以从入学到期末，每个月班里都会发一张全勤奖状，每次都有她，她每次拿到奖状也非常高兴，这也算是对她坚持上幼儿园的肯定吧。
。关于这个话题，Line官方版本下载提供了深入分析
3. 步长逐渐减小，最后步长为1时就是普通插入排序
siftDown(arr, i, 0); // 对剩余i个元素重新建堆