题目网址: http://www.puzzleup.com/2017/ http://www.puzzleup.com/2017/puzzle/?12 答题时限: 10月26日７ＰＭ－比赛结束（约12月27日） 加分时限: 10月26日７ＰＭ－10月31日６：５９ＰＭ 答对可得基本分１００分。答案可上传５次，每改１次答案从基本分扣２０分。　 比赛期间内可随时上传答案，加分时限内答对第ｎ天加（６－ｎ）分　 　　 　　 另依题目的难易有额外加分（如有８０％的人这题答错，答对者加８０分）　　 ◆CANDLE BURNING OVERLAPS Three candles are lighted in a room. How many different possible overlaps of their burning times are there? 一个房间里有三根蜡蠋点燃着。试问它们之间重叠的燃烧时间有几种可能状况？ If the question were asked for two candles, the answer would be 9. 1. The first candle starts, the second one starts, the first one stops, then the second one stops. 2. The first candle starts, the second one starts, the second one stops, then the first one stops. 3. The first candle starts, the second one starts, then they stop at the same time. 4. Candles start at the same time, the first one stops, then the second one stops. 5. Candles start at the same time, the second one stops, then the first one stops. 6. Candles start at the same time, then they stop at the same time. 7. The second candle starts, the first one starts, the second one stops, then the first one stops. 8. The second candle starts, the first one starts, the first one stops, then the second one stops. 9. The second candle starts, the first one starts, they stop at the same time. 若问题改问两根蜡蠋，则答案为 9： 1. 蜡蠋１点燃→蜡蠋２点燃→蜡蠋１熄灭→蜡蠋２熄灭 2. 蜡蠋１点燃→蜡蠋２点燃→蜡蠋２熄灭→蜡蠋１熄灭 3. 蜡蠋１点燃→蜡蠋２点燃→蜡蠋１２同时熄灭 4. 蜡蠋１２同时点燃→蜡蠋１熄灭→蜡蠋２熄灭 5. 蜡蠋１２同时点燃→蜡蠋２熄灭→蜡蠋１熄灭 6. 蜡蠋１２同时点燃→蜡蠋１２同时熄灭 7. 蜡蠋２点燃→蜡蠋１点燃→蜡蠋２熄灭→蜡蠋１熄灭 8. 蜡蠋２点燃→蜡蠋１点燃→蜡蠋１熄灭→蜡蠋２熄灭 9. 蜡蠋２点燃→蜡蠋１点燃→蜡蠋１２同时熄灭 Notes: * For a situation to be considered as an overlap, the burning of each candle must overlap the burning of at least one other candle. * The duration between two non-overlapping burning periods is unimportant. For example, the two cases below are considered the same. (The third candle ignored for brevity) 1. The first candle starts burning, the second one starts as soon as the first one stops, then the second one stops. 2. The first candle starts burning, it stops, the second one starts after a while, then the second one stops. 注： * 一个状况要被考虑为有重叠，每根蜡蠋要至少和其他一根蜡蠋的燃烧时间重叠。 * 没有重叠的燃烧阶段之间的时间长短不重要。 例如以下两种状况视为相同：(暂时忽略第三根蜡蠋) 1. 蜡蠋１点燃→蜡蠋１熄灭时蜡蠋２立刻点燃→蜡蠋２熄灭 2. 蜡蠋１点燃→蜡蠋１熄灭→一会儿後蜡蠋２点燃→蜡蠋２熄灭 ==== 感觉这注解有点微妙... -- 将很小又单纯的命令《Code》组合成函数《Function》。函数累积成更大更方便的元件《 Parts》，成为程式《App》。接着进行动态结合，相互通讯，打造出服务《Service》。 李奥纳多知道，要得到结果，就必须持续进行非常单纯的作业。为了展现出匹敌巨大建筑 的技术，现在非得将面前的碎片组合起来。 知道这条路多麽遥远的人，叫做极客《Geek》。 将这份尊贵具体呈现的人，叫做骇客《Hacker》。 －－记录的地平线 Vol.9 p.299 --

※ 发信站: 批踢踢实业坊(ptt.cc), 来自: 123.195.9.46 ※ 文章网址: https://webptt.com/cn.aspx?n=bbs/puzzle/M.1508934635.A.AAA.html 已修正 ※ 编辑: LPH66 (123.195.9.46), 10/26/2017 20:41:44