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A turnpike consists of N - 1 stretches of road between N toll stations; each stretch has an associated cost of travel and the cost

A turnpike consists of N-1 stretches of road between N toll stations; each stretch has an associated cost of travel and the cost of travel between two toll stations is the sum of the costs of the stretches traveled. For example,
5749
|-----|-------|----|---------|
12345
represents a turnpike with N =5 toll stations numbered 1 through 5 and four road stretches with associated costs 5,7,4, and 9. The cost of traveling from toll station 2 to toll station 5 is 20, for example.
Design a O(1) time algorithm that computes the cost of going between any two stations i and j using a pre-computed one-dimensional array of size O(N). What should this array contain?

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