蒟蒻的博客

题目描述Farmer John has taken his cows on a trip to the city! As the sun sets, the cows gaze at the city horizon and observe the beautiful silhouettes formed by the rectangular buildings.The entir

题目描述Black Box是一种原始的数据库。它可以储存一个整数数组，还有一个特别的变量i。最开始的时候Black Box是空的．而i等于0。这个Black Box要处理一串命令。命令只有两种：ADD(x):把x元素放进BlackBox;GET:i加1，然后输出Blackhox中第i小的数。记住：第i小的数，就是Black Box里的数的按从小到大的顺序排序后的第i个元素。例如