Race Car Leetcode
818. Race Car
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Your car starts at position 0 and speed +1 on an infinite number line. Your car can go into negative positions. Your car drives automatically according to a sequence of instructions 'A' (accelerate) and 'R' (reverse):
When you get an instruction 'A', your car does the following:
position += speed
speed *= 2
When you get an instruction 'R', your car does the following:
If your speed is positive then speed = -1
otherwise speed = 1
Your position stays the same.
Given a target position target, return the length of the shortest sequence of instructions to get there.
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