五月番《Room Mate》宣传图公开 男版《One Room》来袭
2017-2-17 15:13| 发布者: 团长| 查看: 奥门金沙手机娱乐网址 ，305 | 评论: 0 |来自: 网络
将于4月开播的泡面番《Room Mate》近日公布了动画宣传图。作为同一公司的作品，《Room Mate》采用了与1月新番《One Room》相同的第一人称叙述视角，区别在于本次的三位主角都是男士，因此也可以视为男版的《One Room》。
《Room Mate》是由SMIRAL animation继《哥哥锻炼》、《枕男子》和《One Room》之后推出的最新第一人称虚拟视角短篇动画，其中女性版的《One Room》已于2017年1月播出，男性版的《Room Mate》则定档2017年4月。和女性版的配置相同，男性版也以三位英俊潇洒的帅哥为主角，讲述他们和屏幕前观众互动的温馨故事。
Examining the Rooms
A murder happened in the hotel. As the best detective in the town, you should examine all the N rooms of the hotel immediately. However, all the doors of the rooms are locked, and the keys are just locked in the rooms, what a trap! You know that there is exactly one key in each room, and all the possible distributions are of equal possibility. For example, if N = 3, there are 6 possible distributions, the possibility of each is 1/6. For convenience, we number the rooms from 1 to N, and the key for Room 1 is numbered Key 1, the key for Room 2 is Key 2, etc.
To examine all the rooms, you have to destroy some doors by force. But you don’t want to destroy too many, so you take the following strategy: At first, you have no keys in hand, so you randomly destroy a locked door, get into the room, examine it and fetch the key in it. Then maybe you can open another room with the new key, examine it and get the second key. Repeat this until you can’t open any new rooms. If there are still rooms un-examined, you have to randomly pick another unopened door to destroy by force, then repeat the procedure above, until all the rooms are examined.
Now you are only allowed to destroy at most K doors by force. What’s more, there lives a Very Important Person in Room 1. You are not allowed to destroy the doors of Room 1, that is, the only way to examine Room 1 is opening it with the corresponding key. You want to know what is the possibility of that you can examine all the rooms finally.
The first line of the input contains an integer T , indicating the number of test cases. Then T cases follow. Each case contains a line with two numbers N and K. (1 < N ≤ 20, 1 ≤ K < N)
Output one line for each case, indicating the corresponding possibility. Four digits after decimal point are preserved by rounding.