/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode() : val(0), next(nullptr) {}
* ListNode(int x) : val(x), next(nullptr) {}
* ListNode(int x, ListNode *next) : val(x), next(next) {}
* };
*/
class Solution {
public:
ListNode* reverseBetween(ListNode* head, int left, int right) {
ListNode* dummy = new ListNode(0, head);
ListNode* p0 = dummy;
for(int i = 0; i < left - 1; i++) {
p0 = p0->next;
}
ListNode* pre = nullptr, *cur = p0->next;
for(int i = 0; i < right - left + 1; i++) {
ListNode* nxt = cur->next;
cur->next = pre;
pre = cur;
cur = nxt;
}
p0->next->next = cur;
p0->next = pre;
return dummy->next;
}
};
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