Simple O(n) solution of 427E – Police Patrol, round #244
http://randomconstant.wordpress.com/2014/05/03/codeforces-427e-police-patrol/
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Solution of 425A – Sereja and swaps, round #243
My O(n^2 log(n)) approach http://randomconstant.wordpress.com/2014/04/28/codeforces-425a-sereja-and-swaps/
Solution of Problem D – Population Size, round #241 (div. 2)
Check it out on http://randomconstant.wordpress.com/2014/04/13/codeforces-round-241-div-2-problem-d-population-size/
Leetcode Weekly 498 Solution Discussion