It was his colleague Pete Manning who encouraged him to seek help after noticing his friend seemed to be struggling.
// drop-oldest: Discard old data to make room。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
“脚要踩在大地上。我们干任何事情都有内在规律。”，详情可参考同城约会
res[i] = stack.length ? cur - stack[stack.length - 1] : cur;