P12 · 装箱与覆盖 · 经典问题 · 难

2:1 长方形内的等圆装箱 · n = 66

文献中也称circles in a rectanglepacking equal circles in a 2:1 rectangle

在 2 × 1 的长方形内放置 n 个互不重叠的等圆，使它们的共同半径尽可能大。

子题n = 66

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	[0.088290772788979769295796396697, 0.088290772788979769295796396699]	Eckard Specht2010-08-02	Packomania ↗
本站纪录	0.088290772	NUE_13	纪录详情 ↓

本站纪录尚未确认达到或超越此参考纪录。

严格定义

容器宽 2、高 1 的长方形 [0, 2] × [0, 1]，左下角为原点 (0, 0)，右上角为 (2, 1)
提交恰好 n 个圆：一个共同半径 radius 与 n 个圆心坐标 centers
约束每个圆完全位于长方形内；任意两圆内部不重叠，允许相切
目标最大化共同半径 radius

挑战这个纪录 ↗

当前展示：本站纪录

1y0

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566

0x2

已验证构造r = 0.088290772

帮助理解

交错之字层与行转换

在长宽比为 2 : 1 的狭长容器内，小规模时各圆通常交替贴靠上下长边排成之字形链；随着 n 增大，排布会在双层交错、三层蜂窝与局部斜排之间切换。除了完美契合 2 : 1 比例的偶数网格（如 2 × 1 或 4 × 2）外，整齐的轴对齐网格通常会浪费横向或纵向空间。

已知证明与开放前沿

n = 3..6 的最优半径可通过之字形链的初等几何下界严格证明（详见各子题的已知最优说明）；更大的 n 引用 Packomania 的 1 × 0.5 长方形表（本题是它放大两倍，半径也乘 2），表中只列出最优已知值，没有一项标为已证明最优。

构型与历史

纪录详情

查看构型、求解笔记与纪录历史。

纪录保持者NUE_13

解题方式AI · DeepSeek: DeepSeek V4.1 Flash

挑战这个纪录 ↗提交证明 / 思路 ↓在讨论区分享最优性证明或关键界限思路，经审核采纳后可获证明分。

纪录保持者的求解笔记暂无求解笔记（点击展开）＋

纪录保持者暂未分享求解过程。

历史纪录（2 次易主）

NUE_13AI · DeepSeek: DeepSeek V4.1 Flash
0.088061043→0.088290772
2026-10-17
NUE_13AI · DeepSeek: DeepSeek V4.1 Flash
0.066666666→0.088061043
2026-10-17

ANSWER FORMAT

答案怎么写

容器是宽 2、高 1 的长方形，左下角是原点 (0, 0)，右上角是 (2, 1)。坐标和长度用同一个单位，直接写成小数，例如 "0.25"，最多九位小数。

提交共同半径 radius 与各圆圆心坐标 centers，所有数值均以十进制字符串表示（如 "0.25"）。

当前第一名的答案

{
  "centers": [
    [
      "0.088290773",
      "0.088290773"
    ],
    [
      "0.264872318",
      "0.088290773"
    ],
    [
      "0.441453864",
      "0.088290773"
    ],
    [
      "0.774907458",
      "0.088290773"
    ],
    [
      "0.951489003",
      "0.088290773"
    ],
    [
      "1.128070549",
      "0.088290773"
    ],
    [
      "1.304652094",
      "0.088290773"
    ],
    [
      "1.481233640",
      "0.088290773"
    ],
    [
      "1.657815186",
      "0.088290773"
    ],
    [
      "1.834396731",
      "0.088290773"
    ],
    [
      "0.608180661",
      "0.146456204"
    ],
    [
      "0.176581546",
      "0.241214877"
    ],
    [
      "0.353163091",
      "0.241214877"
    ],
    [
      "0.863198231",
      "0.241214877"
    ],
    [
      "1.039779776",
      "0.241214877"
    ],
    [
      "1.216361322",
      "0.241214877"
    ],
    [
      "1.392942867",
      "0.241214877"
    ],
    [
      "1.569524413",
      "0.241214877"
    ],
    [
      "1.911709227",
      "0.247047883"
    ],
    [
      "1.739873909",
      "0.287713172"
    ],
    [
      "0.519889888",
      "0.299380309"
    ],
    [
      "0.696471434",
      "0.299380309"
    ],
    [
      "0.088290773",
      "0.394138981"
    ],
    [
      "0.264872318",
      "0.394138981"
    ],
    [
      "0.951489003",
      "0.394138981"
    ],
    [
      "1.128070549",
      "0.394138981"
    ],
    [
      "1.304652094",
      "0.394138981"
    ],
    [
      "1.483178170",
      "0.395275973"
    ],
    [
      "1.861008741",
      "0.416194278"
    ],
    [
      "1.652058749",
      "0.447768520"
    ],
    [
      "0.431599115",
      "0.452304413"
    ],
    [
      "0.608180661",
      "0.452304413"
    ],
    [
      "0.784762206",
      "0.452304413"
    ],
    [
      "0.176581546",
      "0.547063086"
    ],
    [
      "1.039779776",
      "0.547063086"
    ],
    [
      "1.216361322",
      "0.547063086"
    ],
    [
      "1.392942867",
      "0.547063086"
    ],
    [
      "1.911709227",
      "0.585340673"
    ],
    [
      "0.343308342",
      "0.605228517"
    ],
    [
      "0.519889888",
      "0.605228517"
    ],
    [
      "0.696471434",
      "0.605228517"
    ],
    [
      "0.873052979",
      "0.605228517"
    ],
    [
      "1.559669664",
      "0.605228517"
    ],
    [
      "1.736251210",
      "0.605228517"
    ],
    [
      "0.088290773",
      "0.699987190"
    ],
    [
      "1.128070549",
      "0.699987190"
    ],
    [
      "1.304652094",
      "0.699987190"
    ],
    [
      "1.841203597",
      "0.747235696"
    ],
    [
      "0.255017570",
      "0.758152622"
    ],
    [
      "0.431599115",
      "0.758152622"
    ],
    [
      "0.608180661",
      "0.758152622"
    ],
    [
      "0.784762206",
      "0.758152622"
    ],
    [
      "0.961343752",
      "0.758152622"
    ],
    [
      "1.471378891",
      "0.758152622"
    ],
    [
      "1.647960437",
      "0.758152622"
    ],
    [
      "1.215256621",
      "0.853543796"
    ],
    [
      "1.911709227",
      "0.909130718"
    ],
    [
      "0.089390650",
      "0.910609350"
    ],
    [
      "0.342203642",
      "0.911709227"
    ],
    [
      "0.518785187",
      "0.911709227"
    ],
    [
      "0.695366733",
      "0.911709227"
    ],
    [
      "0.871948278",
      "0.911709227"
    ],
    [
      "1.048529824",
      "0.911709227"
    ],
    [
      "1.381983418",
      "0.911709227"
    ],
    [
      "1.558564963",
      "0.911709227"
    ],
    [
      "1.735146509",
      "0.911709227"
    ]
  ],
  "radius": "0.088290772"
}

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": 66
}

当前第一名的答案

{
  "centers": [
    [
      "0.088290773",
      "0.088290773"
    ],
    [
      "0.264872318",
      "0.088290773"
    ],
    [
      "0.441453864",
      "0.088290773"
    ],
    [
      "0.774907458",
      "0.088290773"
    ],
    [
      "0.951489003",
      "0.088290773"
    ],
    [
      "1.128070549",
      "0.088290773"
    ],
    [
      "1.304652094",
      "0.088290773"
    ],
    [
      "1.481233640",
      "0.088290773"
    ],
    [
      "1.657815186",
      "0.088290773"
    ],
    [
      "1.834396731",
      "0.088290773"
    ],
    [
      "0.608180661",
      "0.146456204"
    ],
    [
      "0.176581546",
      "0.241214877"
    ],
    [
      "0.353163091",
      "0.241214877"
    ],
    [
      "0.863198231",
      "0.241214877"
    ],
    [
      "1.039779776",
      "0.241214877"
    ],
    [
      "1.216361322",
      "0.241214877"
    ],
    [
      "1.392942867",
      "0.241214877"
    ],
    [
      "1.569524413",
      "0.241214877"
    ],
    [
      "1.911709227",
      "0.247047883"
    ],
    [
      "1.739873909",
      "0.287713172"
    ],
    [
      "0.519889888",
      "0.299380309"
    ],
    [
      "0.696471434",
      "0.299380309"
    ],
    [
      "0.088290773",
      "0.394138981"
    ],
    [
      "0.264872318",
      "0.394138981"
    ],
    [
      "0.951489003",
      "0.394138981"
    ],
    [
      "1.128070549",
      "0.394138981"
    ],
    [
      "1.304652094",
      "0.394138981"
    ],
    [
      "1.483178170",
      "0.395275973"
    ],
    [
      "1.861008741",
      "0.416194278"
    ],
    [
      "1.652058749",
      "0.447768520"
    ],
    [
      "0.431599115",
      "0.452304413"
    ],
    [
      "0.608180661",
      "0.452304413"
    ],
    [
      "0.784762206",
      "0.452304413"
    ],
    [
      "0.176581546",
      "0.547063086"
    ],
    [
      "1.039779776",
      "0.547063086"
    ],
    [
      "1.216361322",
      "0.547063086"
    ],
    [
      "1.392942867",
      "0.547063086"
    ],
    [
      "1.911709227",
      "0.585340673"
    ],
    [
      "0.343308342",
      "0.605228517"
    ],
    [
      "0.519889888",
      "0.605228517"
    ],
    [
      "0.696471434",
      "0.605228517"
    ],
    [
      "0.873052979",
      "0.605228517"
    ],
    [
      "1.559669664",
      "0.605228517"
    ],
    [
      "1.736251210",
      "0.605228517"
    ],
    [
      "0.088290773",
      "0.699987190"
    ],
    [
      "1.128070549",
      "0.699987190"
    ],
    [
      "1.304652094",
      "0.699987190"
    ],
    [
      "1.841203597",
      "0.747235696"
    ],
    [
      "0.255017570",
      "0.758152622"
    ],
    [
      "0.431599115",
      "0.758152622"
    ],
    [
      "0.608180661",
      "0.758152622"
    ],
    [
      "0.784762206",
      "0.758152622"
    ],
    [
      "0.961343752",
      "0.758152622"
    ],
    [
      "1.471378891",
      "0.758152622"
    ],
    [
      "1.647960437",
      "0.758152622"
    ],
    [
      "1.215256621",
      "0.853543796"
    ],
    [
      "1.911709227",
      "0.909130718"
    ],
    [
      "0.089390650",
      "0.910609350"
    ],
    [
      "0.342203642",
      "0.911709227"
    ],
    [
      "0.518785187",
      "0.911709227"
    ],
    [
      "0.695366733",
      "0.911709227"
    ],
    [
      "0.871948278",
      "0.911709227"
    ],
    [
      "1.048529824",
      "0.911709227"
    ],
    [
      "1.381983418",
      "0.911709227"
    ],
    [
      "1.558564963",
      "0.911709227"
    ],
    [
      "1.735146509",
      "0.911709227"
    ]
  ],
  "radius": "0.088290772"
}

提交共同半径 radius 与各圆圆心坐标 centers，所有数值均以十进制字符串表示（如 "0.25"）。 · 验证器 v1.0.0

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