Hello friend, I have posted the editorial for the contest PRAYATNA which was conducted at Hackerearth yesterday. As i was able to solve only two problems during the contest, I kindly request people who have solved other problems ( except 1st and 2nd ) to share their logic either in the comments below / send a personal message to me either through codeforces or through my blog so that i can update it. Thank you guys!! Link : http://saraguru.weebly.com/how-i-solved