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rotate

Language/Type: C++ linked lists pointers
Author: Marty Stepp (on 2016/08/27)

Write a function named rotate that accepts a reference to a pointer to a ListNode representing the front of a linked list. Your function should move the value at the front of a list of integers to the end of the list. For example, suppose a variable named front points to the front of a list containing the following sequence of values:

{8, 23, 19, 7, 45, 98, 102, 4}

The call of rotate(front); should move the value 8 from the front of the list to the back, yielding this sequence of values:

{23, 19, 7, 45, 98, 102, 4, 8}

The other values in the list should retain the same order as in the original list. If the method is called for a list of 0 or 1 elements it should have no effect on the list.

Constraints: Do not modify the data field of existing nodes; change the list by changing pointers only. Do not construct any new ListNode objects in solving this problem (though you may create as many ListNode* pointer variables as you like). Do not use any auxiliary data structures to solve this problem (no array, vector, stack, queue, string, etc).

Assume that you are using the ListNode structure as defined below:

struct ListNode {
    int data;         // value stored in each node
    ListNode* next;   // pointer to next node in list (NULL if none)
}
Type your C++ solution code here:


This is a function problem. Write a C++ function as described. Do not write a complete program; just the function(s) above.

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