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yes, we can't edit the main function but do write what I have said earlier inside the insertNodeAtHead function.
I am getting below error when I added #define
solution.cs(67,0): error CS1032: Cannot define or undefine preprocessor symbols after first token in file
Compilation failed: 1 error(s), 0 warnings
Line which I added
static SinglyLinkedListNode insertNodeAtHead(SinglyLinkedListNode llist, int data)
#define headhead head