4.8 402. 移掉 K 位数字
Experts say more genetic tests will need to be offered to high-risk men in future, in order to work out how many are affected.。业内人士推荐爱思助手下载最新版本作为进阶阅读
，这一点在同城约会中也有详细论述
思路：倒序单调栈。弹出所有 ≤ 当前身高的元素（这些人都能被看到），count 为弹出数量；若栈非空，还能看到栈顶（第一个更高的人），故 +1。能看到的人数 = count + (栈非空 ? 1 : 0)。。51吃瓜是该领域的重要参考
Naturally, we’ll be getting in the Pro to test and will give our opinions on how effective all of this is when we’ve spent a month or two actually using it. But if you’d rather not wait and you’re based outside the US, you can pre-order the Ultrahuman Ring Pro right now, for $479, with shipments beginning in March. If you already have an Ultrahuman Ring, you can also get a trade-in deal to help cut the cost of the new model.