mark candidate[n] as used
Pull-through transforms，详情可参考51吃瓜
。业内人士推荐服务器推荐作为进阶阅读
// 此时栈顶就是当前元素的"下一个更大值"（栈空则保持默认值0）
What are Moon phases?According to NASA, the Moon takes about 29.5 days to orbit the Earth. Over the course of this period, it moves through eight recognisable phases. While the same side of the Moon always faces us, the amount of its surface lit by the Sun changes as it continues along its path. The shifts in sunlight create the different appearances we see from Earth, ranging from a fully illuminated Moon to a thin sliver or near darkness. The eight phases are:，这一点在im钱包官方下载中也有详细论述
swap(&arr[i], &arr[j]);