problem

BOJ 2869

solution

condition for arrival:
\(V >= A + ((iteration) - 1) * (A - B)\)
\((V-A)/(A-B) + 1 >= (iteration)\)

in c++, the iteration can be expressed as following:

// min(iteration) is equal to:
(V-A)/(A-B) + 1 + ((V-A)%(A-B) > 0)