1)the common denominator and 2)spiderman is afraid of heights

1)The Common Denominator. 
Solve the problem “Basic Programming 2”, which you can find at this web address: open.kattis.com/problems/basicprogramming2 
Although this problem has several parts, there is a common theme to all of them. Part (a) of this problem is to write down what this common theme is (one sentence max). Part (b) is to solve the problem. 
2) Spiderman is Afraid of Heights.
Solve the problem “Spiderman’s Workout”, which you can find at this web address: open.kattis.com/problems/spiderman