Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4, and 6 to 4 is 2. Total distance traveled = 3 + 4 + 2 = 9.

Example:

 Input  x = [1 2 3 2]
 Output y is 3

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