Puzzleup 2011 (10) Prime Neighbors - 拼圖
By Lauren
at 2011-09-28T22:47
at 2011-09-28T22:47
Table of Contents
題目網址: www.puzzleup.com/2011/puzzle/?228
加分時限: 9/29 7PM - 10/4 7PM
答對可得基本分100分。答案可上傳5次,每改1次答案從基本分扣20分。
比賽期間內可隨時上傳答案,加分時限內答對第n天加(6-n)分
另依題目的難易有額外加分(如有80%的人這題答錯,答對者加80分)
◆Prime Neighbors
All of the numerals in a number are different than each other.
For all the neighboring numeral pairs in this number, the number formed by
these neighboring numerals or its consecutive is a prime number.
What is the largest number satisfying these conditions?
Example: 1029. Pairs: “10” (11 is prime); “02” (both 2 and 3 are primes)
and 29 (29 is prime).
某個數的每一位數都不相等。
若取出這個數的任意連續兩位數,則或者它是質數,或者它的後繼數是質數。
符合此條件的最大數是多少?
例:1029。連續的兩位數分別為"10"(11為質數)、"02"(2和3皆為質數)、
"29"(29為質數)。
--
總算可以有一題真的不用程式了...(倒)
(上一題那些個四位數實在不好確定到底有沒有漏列)
這個 consecutive 我看範例是認為它只代表 +1 的後繼數 -1 沒有的樣子
所以就用上了"後繼數"這個名詞了
話說計分板終於第一次更新了
很怪的是 我和滿分群差 16 分
可是我今年是在第四題剩 1 分的時間加分時開始做的
(也就是前四題我比滿分群分別少 5 5 5 4 分)
怎麼選都不會差 16 分 0.0
--
LPH [acronym]
= Let Program Heal us
-- New Uncyclopedian Dictionary, Minmei Publishing Co.
--
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All Comments
By Sarah
at 2011-09-30T04:59
at 2011-09-30T04:59
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at 2011-10-03T07:50
at 2011-10-03T07:50
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at 2011-10-04T09:50
at 2011-10-04T09:50
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at 2011-10-08T21:39
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at 2011-10-10T22:16
at 2011-10-10T22:16
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at 2011-10-13T06:37
at 2011-10-13T06:37
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