[中譯] Puzzleup 2018 (11) CORDED TRIANGLES

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 (2018/10/11 11:07)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/?11 答題時限: １０月11日７ＰＭ－比賽結束（約12月12日）加分時限: １０月11日７ＰＭ－１０月17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）　　 ◆CORDED TRIANGLES There are X trees in a garden. No three of them are collinear. You have many cords colored yellow, red or blue and you will connect every tree pair with a cord. Cords connecting three trees form triangles and you will receive a penalty point for each triangle that consists of three cords of the same color. What is the maximum value of X that allows you to place the cords without receiving any penalty points. 花園裡有X顆樹。任意三樹不共線。你有許多條繩子，顏色有黃色、紅色與藍色。你要在每顆樹與樹之間綁繩子。三顆樹的繩子會構成三角形，而每出現一個由同色繩子構成的三角形，便罰你一點。問若要不被罰任何分數，X的值最大能多大？ -- ※ 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.1539227273.A.474.html