P02 · 装箱与覆盖 · 经典问题 · 基线易突破 · 难

单位圆内的等圆装箱 · n = 255

文献中也称circles in a circlepacking equal circles in a circlecci

在半径 1 的圆内放置 n 个半径相同、互不重叠的小圆,使共同半径尽可能大。

子题n = 255
目标最大化 共同半径

纪录对比

共同半径 · 越大越好
纪录数值 / 区间作者 / 持有人来源
外部已知最好[0.0573262640068631813740934121605, 0.0573262640068631813740934121615]见来源署名packomania.com ↗
本站纪录暂无选手纪录——

严格定义

  • 容器半径 1 的圆,圆心在 (1, 1),两个坐标都在 0 到 2 之间
  • 提交恰好 n 个圆:一个共同半径 radius 与 n 个圆心 centers
  • 约束每个圆完整落在容器内;两两内部不重叠,相切允许
  • 目标让共同半径尽可能大
挑战这个纪录 ↗

当前展示:起步布局

2y0
0x2
已验证构造r = 0.057326263

帮助理解

哪里有优化空间

最优构形是「卡死」的接触结构:圆彼此顶住、顶住边界,常出现斜排、错位、以及不碰任何邻居的游离圆。规整的网格摆法几乎从不最优。

前沿在哪里

n = 1..14 与 19 已证明;其余规模的最优性仍未知。本站接入 Packomania 中 n = 1..300 的公开构型,大规模部分集中成一张表供算法批量挑战。

查看来源
单位圆内的等圆装箱 n = 255 的当前构型
构型与历史

起步布局

查看构型、求解笔记与纪录历史。

挑战这个纪录 ↗提交证明 / 思路 ↓在讨论区分享证明或思路,审核采纳后可获得证明分。
ANSWER FORMAT

答案怎么写

容器是半径 1 的圆,圆心在 (1, 1),所以两个坐标都在 0 到 2 之间。坐标和半径用同一个单位,直接写成小数,例如 "0.5",最多九位小数。

提交 radius 与 centers。每个数写成十进制字符串,例如 "0.2"。

起步布局答案

{
  "centers": [
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      "0.999404016",
      "1.608807039"
    ],
    [
      "0.759032208",
      "1.911355197"
    ],
    [
      "0.697067326",
      "1.350892235"
    ],
    [
      "0.658670322",
      "1.242860424"
    ],
    [
      "1.442555728",
      "0.781376075"
    ],
    [
      "1.254633003",
      "1.765287637"
    ],
    [
      "1.435779959",
      "0.462471105"
    ],
    [
      "0.699253557",
      "1.654313698"
    ],
    [
      "1.06251",
      "1.829249316"
    ],
    [
      "0.548071199",
      "1.525193204"
    ],
    [
      "1.161005704",
      "0.316452187"
    ],
    [
      "0.691744198",
      "0.744072859"
    ],
    [
      "0.355737818",
      "0.987853035"
    ],
    [
      "0.468928491",
      "1.006103346"
    ],
    [
      "0.32910444",
      "1.298092963"
    ],
    [
      "0.545913196",
      "1.222099096"
    ],
    [
      "0.98647376",
      "1.942576688"
    ],
    [
      "0.732953049",
      "1.155526131"
    ],
    [
      "1.923665375",
      "0.811649136"
    ],
    [
      "0.240220613",
      "0.663873728"
    ],
    [
      "0.292164385",
      "1.189554331"
    ],
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      "0.258003243",
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  ],
  "radius": "0.057326263"
}
提交格式与技术细节需要编写程序或准备 JSON 答案时再查看+

子题参数

{
  "n": 255
}

起步布局答案

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}

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还没有帖子。第一个聊聊这道题的思路?