Truly subquadratic algorithms for 3SUM-hard problems

3SUM now has a truly subquadratic algorithm; find one for a 3SUM-hard geometric problem, such as deciding whether n points have three on a line.

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1	{
2	"domain": "computer-science",
3	"topics": [
4	"algorithms-complexity",
5	"computational-geometry"
6	],
7	"type": "algorithm",
8	"also": [
9	"proof"
10	],
11	"source": {
12	"key": "topp",
13	"name": "The Open Problems Project",
14	"url": "https://topp.openproblem.net/p11",
15	"id": "11",
16	"curator": "Erik D. Demaine, Joseph S. B. Mitchell and Joseph O'Rourke",
17	"poser": "Anka Gajentaan and Mark H. Overmars",
18	"status": "open",
19	"as_of": "2026-10-20",
20	"catalog": "0521c19bbd38"
21	},
22	"review": true,
23	"approval": "first-time"
24	}