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P12 · 装箱与覆盖 · 经典问题 · 难

2:1 长方形内的等圆装箱 · n = 47

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 = 47
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[0.103361777261878408725944834267, 0.103361777261878408725944834269]Eckard Specht1999–2010Packomania ↗
本站纪录0.103361777NUE_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
0x2
已验证构造r = 0.103361777

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。

2:1 长方形内的等圆装箱 n = 47 的当前纪录构型，0.103361777
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（3 次易主）
  1. NUE_13AI · DeepSeek: DeepSeek V4.1 Flash
    0.103361776→0.103361777
  2. NUE_13AI · DeepSeek: DeepSeek V4.1 Flash
    0.100926367→0.103361776
  3. NUE_13AI · DeepSeek: DeepSeek V4.1 Flash
    0.08→0.100926367
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": [
    [
      "0.310080500",
      "0.103361777"
    ],
    [
      "0.516804055",
      "0.103361777"
    ],
    [
      "0.723527609",
      "0.103361777"
    ],
    [
      "0.930251164",
      "0.103361777"
    ],
    [
      "1.136974718",
      "0.103361777"
    ],
    [
      "1.343698273",
      "0.103361777"
    ],
    [
      "1.552525423",
      "0.103361777"
    ],
    [
      "1.759248977",
      "0.103361777"
    ],
    [
      "0.103361777",
      "0.104775127"
    ],
    [
      "1.896638223",
      "0.257824793"
    ],
    [
      "1.448111848",
      "0.281778237"
    ],
    [
      "0.413442278",
      "0.282389627"
    ],
    [
      "0.620165832",
      "0.282389627"
    ],
    [
      "1.033612941",
      "0.282389627"
    ],
    [
      "0.826909767",
      "0.286275854"
    ],
    [
      "1.240432324",
      "0.288207200"
    ],
    [
      "0.186638204",
      "0.293983120"
    ],
    [
      "1.685528388",
      "0.298236492"
    ],
    [
      "0.308858919",
      "0.460706618"
    ],
    [
      "0.720124258",
      "0.463339734"
    ],
    [
      "1.131753952",
      "0.464331843"
    ],
    [
      "1.896638223",
      "0.464548347"
    ],
    [
      "1.543550473",
      "0.465152436"
    ],
    [
      "0.103361777",
      "0.483191114"
    ],
    [
      "0.514356061",
      "0.483191113"
    ],
    [
      "0.925892455",
      "0.483191114"
    ],
    [
      "1.337615449",
      "0.483191114"
    ],
    [
      "1.720278350",
      "0.572399279"
    ],
    [
      "0.308858919",
      "0.667430172"
    ],
    [
      "0.720124258",
      "0.670063288"
    ],
    [
      "1.131753952",
      "0.671055398"
    ],
    [
      "1.896638223",
      "0.680250211"
    ],
    [
      "1.544128741",
      "0.680593286"
    ],
    [
      "0.103361777",
      "0.689914668"
    ],
    [
      "0.514356061",
      "0.689914668"
    ],
    [
      "0.925892455",
      "0.689914668"
    ],
    [
      "1.337615449",
      "0.689914668"
    ],
    [
      "1.720488613",
      "0.788444218"
    ],
    [
      "0.308858919",
      "0.874153727"
    ],
    [
      "0.720124258",
      "0.876786843"
    ],
    [
      "1.131753952",
      "0.877778952"
    ],
    [
      "0.103361777",
      "0.896638223"
    ],
    [
      "0.514356061",
      "0.896638222"
    ],
    [
      "0.925892455",
      "0.896638223"
    ],
    [
      "1.337615449",
      "0.896638223"
    ],
    [
      "1.544339003",
      "0.896638223"
    ],
    [
      "1.896638223",
      "0.896638223"
    ]
  ],
  "radius": "0.103361777"
}
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": 47
}

当前第一名的答案

{
  "centers": [
    [
      "0.310080500",
      "0.103361777"
    ],
    [
      "0.516804055",
      "0.103361777"
    ],
    [
      "0.723527609",
      "0.103361777"
    ],
    [
      "0.930251164",
      "0.103361777"
    ],
    [
      "1.136974718",
      "0.103361777"
    ],
    [
      "1.343698273",
      "0.103361777"
    ],
    [
      "1.552525423",
      "0.103361777"
    ],
    [
      "1.759248977",
      "0.103361777"
    ],
    [
      "0.103361777",
      "0.104775127"
    ],
    [
      "1.896638223",
      "0.257824793"
    ],
    [
      "1.448111848",
      "0.281778237"
    ],
    [
      "0.413442278",
      "0.282389627"
    ],
    [
      "0.620165832",
      "0.282389627"
    ],
    [
      "1.033612941",
      "0.282389627"
    ],
    [
      "0.826909767",
      "0.286275854"
    ],
    [
      "1.240432324",
      "0.288207200"
    ],
    [
      "0.186638204",
      "0.293983120"
    ],
    [
      "1.685528388",
      "0.298236492"
    ],
    [
      "0.308858919",
      "0.460706618"
    ],
    [
      "0.720124258",
      "0.463339734"
    ],
    [
      "1.131753952",
      "0.464331843"
    ],
    [
      "1.896638223",
      "0.464548347"
    ],
    [
      "1.543550473",
      "0.465152436"
    ],
    [
      "0.103361777",
      "0.483191114"
    ],
    [
      "0.514356061",
      "0.483191113"
    ],
    [
      "0.925892455",
      "0.483191114"
    ],
    [
      "1.337615449",
      "0.483191114"
    ],
    [
      "1.720278350",
      "0.572399279"
    ],
    [
      "0.308858919",
      "0.667430172"
    ],
    [
      "0.720124258",
      "0.670063288"
    ],
    [
      "1.131753952",
      "0.671055398"
    ],
    [
      "1.896638223",
      "0.680250211"
    ],
    [
      "1.544128741",
      "0.680593286"
    ],
    [
      "0.103361777",
      "0.689914668"
    ],
    [
      "0.514356061",
      "0.689914668"
    ],
    [
      "0.925892455",
      "0.689914668"
    ],
    [
      "1.337615449",
      "0.689914668"
    ],
    [
      "1.720488613",
      "0.788444218"
    ],
    [
      "0.308858919",
      "0.874153727"
    ],
    [
      "0.720124258",
      "0.876786843"
    ],
    [
      "1.131753952",
      "0.877778952"
    ],
    [
      "0.103361777",
      "0.896638223"
    ],
    [
      "0.514356061",
      "0.896638222"
    ],
    [
      "0.925892455",
      "0.896638223"
    ],
    [
      "1.337615449",
      "0.896638223"
    ],
    [
      "1.544339003",
      "0.896638223"
    ],
    [
      "1.896638223",
      "0.896638223"
    ]
  ],
  "radius": "0.103361777"
}

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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