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 = 280

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 = 280
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[0.0548067639185, 0.0548067639195]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 = 0.054806763

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 = 280 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": [
    [
      "0.970316931",
      "0.055272966"
    ],
    [
      "0.861141407",
      "0.065062278"
    ],
    [
      "1.168863865",
      "0.070013307"
    ],
    [
      "0.753833381",
      "0.087425483"
    ],
    [
      "1.066193072",
      "0.108403851"
    ],
    [
      "1.339277133",
      "0.117797483"
    ],
    [
      "0.649836027",
      "0.122061821"
    ],
    [
      "1.236606341",
      "0.156188027"
    ],
    [
      "0.947345086",
      "0.162452348"
    ],
    [
      "1.439132072",
      "0.163009393"
    ],
    [
      "0.545855615",
      "0.171062349"
    ],
    [
      "0.838169563",
      "0.172241659"
    ],
    [
      "1.133935548",
      "0.194578571"
    ],
    [
      "1.321188923",
      "0.22590827"
    ],
    [
      "0.452942833",
      "0.229228049"
    ],
    [
      "0.637646082",
      "0.230995428"
    ],
    [
      "1.523714654",
      "0.232729635"
    ],
    [
      "1.031264756",
      "0.232969115"
    ],
    [
      "0.747232293",
      "0.233442463"
    ],
    [
      "1.218518131",
      "0.264298814"
    ],
    [
      "0.928325685",
      "0.270649684"
    ],
    [
      "1.421043862",
      "0.271120179"
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    [
      "1.619460117",
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    [
      "0.552825247",
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  "radius": "0.054806763"
}
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": 280
}

起步布局答案

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  "radius": "0.054806763"
}

提交 radius 与 centers。每个数写成十进制字符串,例如 "0.2"。 · 验证器 v1.0.0

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还没有帖子。第一个聊聊这道题的思路?