🧠 Before you code — what pattern fits?
A biker starts a trip at altitude 0. Given an array gain where gain[i] is the net gain in altitude between points i and i+1, return the highest altitude reached.
[-5,1,5,0,-7] → 1
[-4,-3,-2,-1,4,3,2] → 0
🎬 Video explanation · Programmers Zone
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