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朋友在一所大学里当宿舍管理员,她管理的那个楼住着一群男生,每个宿舍4个人,每个人1把钥匙。这些学生很爱睡懒觉,总爱拖到快上课了才匆匆忙忙地起来刷牙洗脸,然后直奔教室。等到下课回来,一摸口袋,坏了,钥匙忘在宿舍里了,于是只能等其他同学回来,更多的则是找她要钥匙。期末的时候,朋友做了一次统计,她发现连在一起的6间宿舍,居然一次也没来麻烦她开门。原来,他们每个宿舍都另外加配了一把钥匙,存放到下一个宿舍中。把6个宿舍和6把钥匙分别编上号,钥匙一存放到宿舍二,钥匙二存放到宿舍三,依此类推,最后把钥匙六存放到宿舍一。这么一来,24个人中只要有1个人带了钥匙,那所有人都不会被堵在宿舍外,因为只要有一把钥
My friend was a dormitory administrator at a university where she managed to live with a group of boys, four in each dormitory, and one key for each. These students love to sleep late, always love to drag the class to rush to brush their teeth and wash, and then went straight to the classroom. Wait until get out of class back, touch pocket, broken, the key forgotten in the dorm, so can only wait for other students to come back, more is to find her key. At the end of the period, a friend made a statistics, she found that even six dorms, actually did not trouble her to open the door. It turned out that they each have an additional additional with a key, stored in the next dormitory. The six dormitories and six keys, respectively, on the serial number, the key stored in a dormitory two, the key two stored in the dormitory three, and so on, and finally the key six to store a dormitory. As a result, as long as one of the 24 individuals with the key, then all will not be blocked in the dormitory, as long as there is a key