Partial List Reversal

February 9, 2018

We’re a few weeks into the beginning of a new school term, and the beginning-programmer message boards are swelling with questions from new students. This question caught my eye; I imagine it’s from a second-semester programming student who learned C in the first semester and is now taking a class in data structures:

Write a program that, given a linked list and two integer indices, reverses the portion of the list between the two indices. For instance, reversing the list [0,1,2,3,4,5,6,7,8,9] between indices 3 (inclusive) and 6 (exclusive) yields the list [0,1,2,5,4,3,6,7,8,9].

Your task is to help the student by writing a program to reverse a portion of a list. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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