Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, February 03, 2004, 12:15 pm

Duration: This information is not available in the database

Location: This information is not available in the database

Speaker: Sandra Roost

Seventeen lines and one-hundred-and-one points

In his paper "Seventeen lines and one-hundred-and-one points", Woeginger describes a simple a polynomial-time algorithm to find the solution of the following curious problem: "Given two positive integers S and Q, does there exist a sequence of positive integers that add up to S and whose squares add up to Q?" Along with this problem, he presents a second one about arranging m lines in the Euclidean plane in a way that there are exactly n points of intersection.
In this talk, I present the two problems, their connection, the algorithm along with its analysis and the outlook to other problems.

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