[中譯] Puzzleup 2018 (5) NUMBER SELECTION

看板puzzle (益智遊戲 - 數獨,拼圖,推理,西洋棋)作者buffalobill (水牛比爾)時間7年前 (2018/08/30 14:31)推噓0(0推 0噓 0→)

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題目網址: http://www.puzzleup.com/2018/ http://www.puzzleup.com/2018/puzzle/?5 答題時限: ８月30日７ＰＭ－比賽結束（約12月12日）加分時限: ８月30日７ＰＭ－９月5日６：５９ＰＭ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）　　 ◆NUMBER SELECTION Given any X integers (not necessarily distinct), if it is always possible to select Y of them whose sum is divisible by 7, what is the minimum value of X and the corresponding value of Y? Note: X and Y are positive integers. If the same question were asked for divisibility by 2, the minimum value of X would be 3 and the corresponding value of Y would be 2. Enter the minimum X, then the corresponding Y without using a space in between. 給予X個任意整數(可以重覆)，一定能從中挑選出Y個數，使其總和能整除於7，則X的最小值與其相應的Y值呢？註：X與Y都是正整數。若題目要求整除於2，則X的最小值會是3，相對應的Y會是2。輸入最小的X，接著相對應的Y，中間無需空格。 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 60.251.148.94 ※ 文章網址: https://www.ptt.cc/bbs/puzzle/M.1535610667.A.745.html