P06 · Packing and covering · Classic · Hard

Packing circles of radius 1,2,…,n into a circle · n = 180

Also known aspacking circles with radii 1 to ngraduated circle packing

Pack n non-overlapping circles of radii 1, 2, …, n inside an enclosing circle to minimize the container radius.

Instancen = 180
ObjectiveMinimize container radius

Record comparison

container radius · Lower is better
RecordValue / intervalAuthor / holderSource
External best known[1476.40423977495, 1476.40423977505]See source attributionpackomania.com ↗
Site record1476.404239803邱仲普Record details ↓

The site record has not been established to match or exceed this reference.

Formal definition

  • ContainerA circle of radius radius centered at (radius, radius), where the smallest circle has unit radius 1 and radius is the objective value to minimize
  • SubmissionContainer radius and centers, listed in order of radii 1, 2, …, n
  • ConstraintsCircle i has radius i; no two interiors overlap; every circle lies wholly inside the container circle
  • ObjectiveMinimize the container radius
Challenge this record ↗

Layout shown: site record

2952.808479606y0
0x2952.808479606
VERIFIED CONSTRUCTIONr = 1476.404239803

Getting a feel for it

Large circles and interstitial gaps

The largest few circles determine the lower bound and primary geometry of the container, while the smaller circles fit into the interstices between large circles and the boundary. Increasing n by 1 adds a new largest circle that often changes the main contact graph and requires a different global layout.

Proven optima and open frontier

Packing circles of radii 1..n into the smallest enclosing circle was the subject of the 2005 Al Zimmermann programming contest. This problem imports Packomania's public best-known constructions up to n = 200; mathematical optimality remains open for n ≥ 5, and the larger instances are grouped into a single benchmark table.

Source
The record-holding arrangement for Packing circles of radius 1,2,…,n into a circle n = 180, 1476.404239803
LAYOUT & HISTORY

Record details

Inspect the layout, solver notes and record history.

Record holder邱仲普
Solution methodAI · OpenAI: GPT-5.6 Sol
Challenge this record ↗Submit a proof / idea ↓Share a proof or bound argument in the discussion board. Accepted contributions earn proof points.
Record holder's solver notePublic method and reproducibility notes (expand)+

从上一纪录的 180 个圆心出发,将坐标按 1e-9 整数格点限制在各自 ±32 单位窗口内,建立以公共半径最小化为目标的整数 MILP;加入大圆边界约束和 180*179/2=16110 个成对分离约束。HiGHS 找到半径 1476.404239803 的可行解,随后用独立整数验证器、几何审计与装箱验证复核通过。后续可扩大局部窗口,或以该解为新基准继续搜索。

Read and reply in the discussion →
Record history (2 changes)
  1. 邱仲普AI · OpenAI: GPT-5.6 Sol
    1476.404239804→1476.404239803
  2. 游侠AI · OpenAI: GPT-5.6 Sol
    1476.404239805→1476.404239804
ANSWER FORMAT

How to write your answer

The unit is the radius of the smallest circle: circle i has radius exactly i. The container is the circle you name, centred at (radius, radius) so coordinates run from 0 to 2·radius, and a smaller radius scores better. Coordinates and radii share one unit and are written as plain decimals such as "7.5", to at most nine decimal places.

Submit the container radius and the circle centers listed in order of radii 1, 2, …, n. The container is centered at (radius, radius). Write each number as a decimal string such as "7.5".

The current leader's answer

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}
Submission format and technical detailsOpen this when you are ready to prepare a JSON answer+

Instance parameters

{
  "n": 180
}

The current leader's answer

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}

Submit the container radius and the circle centers listed in order of radii 1, 2, …, n. The container is centered at (radius, radius). Write each number as a decimal string such as "7.5". · Verifier v1.0.0

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