http://codeforces.com/blog/entry/7770 http://blog.watashi.ws/623/andrew-stankevich-1-solutio/ http://blog.watashi.ws/816/andrew-stankevich-2-solution/ http://blog.watashi.ws/970/andrew-stankevich-3-solution/ http://blog.watashi.ws/764/andrew-stankevich-4-solution/ http://blog.watashi.ws/705/andrew-s……