I need help completing this with C++
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* reverseList(ListNode* head) {
}
};
Iterative Solution
class Solution{
public:
ListNode* reverseList( ListNode* head) {
ListNode* cur = head;
ListNode* after = NULL;
ListNode* prev = NULL;
while( cur)
{
after = cur->next;
cur -> next = prev;
prev = cur;
cur = after;
}
return prev;
}
};
*******************************************************************************************************************************
Recursive Solution
class Solution{
public:
ListNode* reverseList( ListNode* head) {
if( head == NULL)
return NULL;
if( head->next == NULL)
return head;
ListNode* first = head;
ListNode* rest;
rest = reverseList( head -> next);
first -> next -> next = first;
first ->next = NULL;
head = rest;
return head;
}
};
I need help completing this with C++ /** * Definition for singly-linked list. * struct ListNode...
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