1732. Find the Highest Altitude

There is a biker going on a road trip. The road trip consists of n + 1 points at various altitudes. The biker starts his trip on point 0 with altitude equal 0. You are given an integer array gain of length n where gain[i] is the net gain in altitude between points i​​​​​​ and i + 1 for all (0 <= i < n). Return the highest altitude of a point. Example 1: Input: gain = [-5,1,5,0,-7] Output: 1 E