Need Help in Rubber Band Problem

Can someone Help me How do i solve Rubber Band Problem?
Please Suggest some Blogs etc as well.

Blog post:

Similar problems:

XIV Open Cup named after E.V. Pankratiev, Grand Prix of Udmurtia, Division 1, Problem B, Black hole
http://www.opencup.ru/files/oce/gp8/problems-e.pdf

ACM International Collegiate Programming Contest, Japan Domestic Contest, Tokyo, Japan, Problem F, Tighten Up!
http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1164

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