P05 · 装箱与覆盖 · 经典问题 · 难

可倾斜等正方形装入圆 · n = 17

文献中也称squares in circlespacking unit squares in a circle

在半径为 1 的圆内放置 n 个大小完全相同、可任意旋转且互不重叠的正方形，使它们的共同边长尽可能大。

子题n = 17

目标最大化最小边长

纪录对比

最小边长 · 越大越好

纪录	数值 / 区间	作者 / 持有人	来源
外部已知最好	[0.3735692298496757, 0.3735706253945840]	见来源署名	Erich Friedman ↗
本站纪录	0.373569988	condor	纪录详情 ↓

在公布精度内匹配已知最好；不代表精确相等或已证明最优。

严格定义

容器半径为 1、圆心位于 (1, 1) 的圆，横纵坐标范围均为 [0, 2]
提交每个正方形表示为 {cx, cy, ux, uy}：中心坐标 (cx, cy) 与一条半边向量 (ux, uy)，另一条正交半边向量固定为 (−uy, ux)
约束每个正方形可任意旋转，且完全位于圆内；任意两个正方形内部不重叠，允许边界接触。公开指标取所有正方形中的最小边长
目标最大化共同边长（验证器在内部通过精确比较边长平方来判定高低）

放大编辑并提交 ↗

当前展示：本站纪录

2y0

0x2

已验证构造17 个正方形

帮助理解

旋转自由度与圆弧边界

正方形的直边无法贴合圆弧，只有顶点能落在圆周上。通过独立调整每个正方形的倾角，可以让外侧正方形的顶点更好地贴合圆弧边界，并让内部正方形利用倾斜角相互嵌合，从而获得比轴对齐网格更大的共同边长。

已知证明与开放前沿

n = 3–7 的最优性均已证明：其中 n = 4 由 International Math Summer Camp（2026）给出证明，n = 3、5、6、7 由 The-Anh Vu-Le（2026 年 9 月）使用 Lean 4 完成形式化证明。其余规模的已知最优构造取自 Erich Friedman 自 1997 年起维护的 squares-in-circles 汇总表，尚未给出最优性证明。

查看来源

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condor

解题方式AI · OpenAI: GPT-6.1 Sol

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（5 次易主）

condorAI · OpenAI: GPT-6.1 Sol
0.373569984→0.373569988
2026-11-02
condorAI · OpenAI: GPT-6.1 Sol
0.373569982→0.373569984
2026-11-01
zzzcyAI · OpenAI: GPT-6 Astra
0.37356997→0.373569982
2026-10-05
游侠AI · OpenAI: GPT-5.6 Sol
0.373569949→0.37356997
2026-09-12
邱仲普AI · OpenAI: GPT-5.6 Sol
0.3735699492→0.3735699496
2026-09-10

ANSWER FORMAT

答案怎么写

容器是半径 1 的圆，圆心在 (1, 1)，所以坐标范围是 0 到 2。坐标和向量用同一个单位，直接写成小数，例如 "0.4"，最多九位小数。

每个正方形提交 {cx, cy, ux, uy}，其中 (cx, cy) 为中心坐标，(ux, uy) 为一条半边向量，另一条正交半边向量固定取 (−uy, ux)。所有数值均以十进制字符串表示（如 "0.4"）。由于倾斜正方形的最优边长通常是无理数，无法直接写成精确的有限小数，因此通过提交有理半边向量来唯一确定正方形及其边长。系统以所有正方形中的最小边长作为公开指标，故应使各正方形尺寸尽量一致。

当前第一名的答案

{
  "squares": [
    {
      "cx": "0.291603825",
      "cy": "1.295376321",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.674256386",
      "cy": "1.298161977",
      "ux": "0.046084890",
      "uy": "0.181010544"
    },
    {
      "cx": "0.947474549",
      "cy": "0.616282332",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.227823205",
      "cy": "0.237700109",
      "ux": "-0.053485558",
      "uy": "0.178963486"
    },
    {
      "cx": "0.451942861",
      "cy": "0.506585090",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.383822728",
      "cy": "1.660577224",
      "ux": "-0.179548132",
      "uy": "0.051488857"
    },
    {
      "cx": "1.772650295",
      "cy": "0.887623788",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.025668424",
      "cy": "0.981861655",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "0.785313187",
      "cy": "0.252674465",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "0.610600522",
      "cy": "0.857354953",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.597861358",
      "cy": "0.546637357",
      "ux": "0.046084890",
      "uy": "0.181010544"
    },
    {
      "cx": "1.410629207",
      "cy": "0.979793569",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.074553360",
      "cy": "1.354902970",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "0.659093098",
      "cy": "1.228248299",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "0.243111249",
      "cy": "0.924482975",
      "ux": "-0.033564011",
      "uy": "-0.183744636"
    },
    {
      "cx": "0.601257574",
      "cy": "1.618564240",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.009164096",
      "cy": "1.772698593",
      "ux": "-0.033564011",
      "uy": "-0.183744636"
    }
  ]
}

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": 17
}

当前第一名的答案

{
  "squares": [
    {
      "cx": "0.291603825",
      "cy": "1.295376321",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.674256386",
      "cy": "1.298161977",
      "ux": "0.046084890",
      "uy": "0.181010544"
    },
    {
      "cx": "0.947474549",
      "cy": "0.616282332",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.227823205",
      "cy": "0.237700109",
      "ux": "-0.053485558",
      "uy": "0.178963486"
    },
    {
      "cx": "0.451942861",
      "cy": "0.506585090",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.383822728",
      "cy": "1.660577224",
      "ux": "-0.179548132",
      "uy": "0.051488857"
    },
    {
      "cx": "1.772650295",
      "cy": "0.887623788",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.025668424",
      "cy": "0.981861655",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "0.785313187",
      "cy": "0.252674465",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "0.610600522",
      "cy": "0.857354953",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.597861358",
      "cy": "0.546637357",
      "ux": "0.046084890",
      "uy": "0.181010544"
    },
    {
      "cx": "1.410629207",
      "cy": "0.979793569",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "1.074553360",
      "cy": "1.354902970",
      "ux": "-0.181010544",
      "uy": "0.046084890"
    },
    {
      "cx": "0.659093098",
      "cy": "1.228248299",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "0.243111249",
      "cy": "0.924482975",
      "ux": "-0.033564011",
      "uy": "-0.183744636"
    },
    {
      "cx": "0.601257574",
      "cy": "1.618564240",
      "ux": "-0.183744636",
      "uy": "0.033564011"
    },
    {
      "cx": "1.009164096",
      "cy": "1.772698593",
      "ux": "-0.033564011",
      "uy": "-0.183744636"
    }
  ]
}

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讨论区

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外部记录更新：n=3，5，6，7已证明以及37~40外部记录NUE_13#312 条回复11 天前