logo CodeStepByStep logo

Main Page → Exercises → C++ → Solve an Exercise

contains

Language/Type: C++ linked lists pointers

Write a function named contains that accepts a pointer to a ListNode representing the front of a linked list, along with an integer value. Your function should return true if the given value occurs in the list and false if not. If the list is empty (null), return false.

Constraints: 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). Your function should not modify the linked list's state; the state of the list should remain constant with respect to your function.

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 (nullptr if none)
}
Function: Write a C++ function as described, not a complete program.

You must log in before you can solve this problem.

Log In

Need help?

Stuck on an exercise? Contact your TA or instructor.

If something seems wrong with our site, please

Is there a problem? Contact us.