unsolved-problems https://www.hackerrank.com/contests/w29/challenges/megaprime-numbers https://www.codechef.com/LTIME45/problems/BRIBETR https://www.hackerrank.com/contests/w29/challenges/minimal-distance-to-pi http://www.spoj.com/problems/ADFRUITS/ http://www.spoj.com/problems/JULKA/