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等腰直角三角形装入正方形 · n = 20

把 n 个直角边为 1 的等腰直角三角形（七巧板的小三角形）装入正方形，允许接触但内部不能重叠，最小化容器正方形边长。

子题n = 20

目标最小化容器正方形边长

已知最好（未证明）3.26857来源精度区间：3.26857–3.26858（区间内视为追平）本站展示证书 3.268570008Erich Friedman 编录；Found by Aapo Lippoen in July 2026. 原式：s = 3.26857+。

严格定义

容器编辑器及证书统一缩放到单位正方形 [0,1]²；仅是坐标约定，分数按文献的单位图形计算。边界接触允许。
提交提交 {radius, placements:[{x,y,turn,quarter},…]}，x、y、turn 用最多九位小数的十进制字符串。radius 是零件的短边长（直角边、多米诺的短边、方格边长），容器正方形边长 = 1/radius。x、y 是零件外接矩形的中心；quarter 是 0–3 的整数，先绕中心精确转 quarter 个直角，再转 turn = tan(θ/2) 给出的有理角。坐标和 turn 限于 ±4，0 < radius ≤ 4。
约束恰好 n 个同样大的图形，完整位于容器内，任意两图形内部不重叠。多边形可独立旋转，不限直角。
精度输入小数精确表示有理数；正多边形的顶点用代数数定义，不截断成小数。可行性验算没有浮点容差。有限小数证书不等于连续最优性证明。
目标容器正方形边长 = 1/r（r 是零件短边在单位正方形里的长度），越小越好。页面、排行榜和外部纪录使用相同单位，自动计算，无需手工换算。

放大来摆，然后提交 ↗

已验证构造已验证构造

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外部来源与证书

外部目标按原始印刷精度换算，本站坐标证书另存。复现损失不降低文献目标；源表的构造不自动视为最优性证明。

查看来源

当前第一名

3.268570008

容器正方形边长

已追平已知最好

答案来源Aapo Lippoen

解题方式公开参考构造

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。

纪录保持者的求解笔记暂无求解笔记（点击展开）＋

纪录保持者还没有分享求解过程。

ANSWER FORMAT

答案怎么写

单位正方形 [0,1]²

提交 {radius, placements:[{x,y,turn,quarter},…]}，x、y、turn 用最多九位小数的十进制字符串。radius 是零件的短边长（直角边、多米诺的短边、方格边长），容器正方形边长 = 1/radius。x、y 是零件外接矩形的中心；quarter 是 0–3 的整数，先绕中心精确转 quarter 个直角，再转 turn = tan(θ/2) 给出的有理角。坐标和 turn 限于 ±4，0 < radius ≤ 4。

当前第一名的答案

{
  "placements": [
    {
      "quarter": 2,
      "turn": "0.035798384",
      "x": "0.836419363",
      "y": "0.141696040"
    },
    {
      "turn": "0.028065282",
      "x": "0.484597625",
      "y": "0.161371947"
    },
    {
      "quarter": 2,
      "turn": "0.028065298",
      "x": "0.179019521",
      "y": "0.144206150"
    },
    {
      "turn": "0.028065288",
      "x": "0.809383418",
      "y": "0.161371949"
    },
    {
      "quarter": 2,
      "turn": "0.028065286",
      "x": "0.503805240",
      "y": "0.144207531"
    },
    {
      "turn": "0.028065307",
      "x": "0.189764231",
      "y": "0.451352121"
    },
    {
      "turn": "0.028065301",
      "x": "0.501288452",
      "y": "0.450608541"
    },
    {
      "turn": "0.035798328",
      "x": "0.814534522",
      "y": "0.446972478"
    },
    {
      "turn": "0.000000000",
      "x": "0.806059864",
      "y": "0.761106120"
    },
    {
      "quarter": 1,
      "turn": "0.000000000",
      "x": "0.193940139",
      "y": "0.761106121"
    },
    {
      "quarter": 2,
      "turn": "0.028065299",
      "x": "0.505657518",
      "y": "0.446704236"
    },
    {
      "turn": "0.000000000",
      "x": "0.500000002",
      "y": "0.761106118"
    },
    {
      "quarter": 2,
      "turn": "0.035798330",
      "x": "0.817393995",
      "y": "0.444495568"
    },
    {
      "quarter": 1,
      "turn": "-0.414213562",
      "x": "0.783582993",
      "y": "0.999999997"
    },
    {
      "quarter": 2,
      "turn": "0.028065302",
      "x": "0.194965390",
      "y": "0.446704238"
    },
    {
      "quarter": 2,
      "turn": "0.000000000",
      "x": "0.500000001",
      "y": "0.761106123"
    },
    {
      "quarter": 1,
      "turn": "-0.414213562",
      "x": "0.216417009",
      "y": "0.999999997"
    },
    {
      "turn": "-0.414213562",
      "x": "0.999999997",
      "y": "0.783582993"
    },
    {
      "quarter": 2,
      "turn": "-0.414213562",
      "x": "0.000000003",
      "y": "0.783582995"
    },
    {
      "turn": "0.000000000",
      "x": "0.153029933",
      "y": "0.153029933"
    }
  ],
  "radius": "0.305944189"
}

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": 20,
  "sides": 5
}

当前第一名的答案

{
  "placements": [
    {
      "quarter": 2,
      "turn": "0.035798384",
      "x": "0.836419363",
      "y": "0.141696040"
    },
    {
      "turn": "0.028065282",
      "x": "0.484597625",
      "y": "0.161371947"
    },
    {
      "quarter": 2,
      "turn": "0.028065298",
      "x": "0.179019521",
      "y": "0.144206150"
    },
    {
      "turn": "0.028065288",
      "x": "0.809383418",
      "y": "0.161371949"
    },
    {
      "quarter": 2,
      "turn": "0.028065286",
      "x": "0.503805240",
      "y": "0.144207531"
    },
    {
      "turn": "0.028065307",
      "x": "0.189764231",
      "y": "0.451352121"
    },
    {
      "turn": "0.028065301",
      "x": "0.501288452",
      "y": "0.450608541"
    },
    {
      "turn": "0.035798328",
      "x": "0.814534522",
      "y": "0.446972478"
    },
    {
      "turn": "0.000000000",
      "x": "0.806059864",
      "y": "0.761106120"
    },
    {
      "quarter": 1,
      "turn": "0.000000000",
      "x": "0.193940139",
      "y": "0.761106121"
    },
    {
      "quarter": 2,
      "turn": "0.028065299",
      "x": "0.505657518",
      "y": "0.446704236"
    },
    {
      "turn": "0.000000000",
      "x": "0.500000002",
      "y": "0.761106118"
    },
    {
      "quarter": 2,
      "turn": "0.035798330",
      "x": "0.817393995",
      "y": "0.444495568"
    },
    {
      "quarter": 1,
      "turn": "-0.414213562",
      "x": "0.783582993",
      "y": "0.999999997"
    },
    {
      "quarter": 2,
      "turn": "0.028065302",
      "x": "0.194965390",
      "y": "0.446704238"
    },
    {
      "quarter": 2,
      "turn": "0.000000000",
      "x": "0.500000001",
      "y": "0.761106123"
    },
    {
      "quarter": 1,
      "turn": "-0.414213562",
      "x": "0.216417009",
      "y": "0.999999997"
    },
    {
      "turn": "-0.414213562",
      "x": "0.999999997",
      "y": "0.783582993"
    },
    {
      "quarter": 2,
      "turn": "-0.414213562",
      "x": "0.000000003",
      "y": "0.783582995"
    },
    {
      "turn": "0.000000000",
      "x": "0.153029933",
      "y": "0.153029933"
    }
  ],
  "radius": "0.305944189"
}

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