题目链接 You are given two integers a and b. In one turn, you can do one of the following operations: Take an integer c (c>1 and a should be divisible by c) and replace a with ac; Take an integer c (c>1
题目链接 You are given two integers l and r, where l<r. We will add 1 to l until the result is equal to r. Thus, there will be exactly r−l additions performed. For each such addition, let’s look at the nu