Problem Link: http://www.codechef.com/problems/BYTES2
Difficulty: Easy-Medium
Strategy: Binary Search
Explanation: The solution to the problem is implementing binary search on domain 1 to 10^9 and have to find largest term(x) such that (x+5)*(x-1)<=given A. If ans comes out to be 1 print -1 because with size 1 there doesn't exist any area.