stack.pop(); // 弹出无效候选值
Directors must follow the F-Droid Code of Conduct and exemplify high standards in the F-Droid community.
，这一点在同城约会中也有详细论述
Nottingham Forest have appointed a new director of performance, Tottenham’s former head of medicine and sports science Geoff Scott, amid concerns that injury problems have exacerbated their struggle to avoid relegation.
// 右侧第一个 <= cur 的元素, 所以用大于的就弹出