Question Type: Medium
Complexities: Time: O(n), Space: O(1)

Code:

class Solution {
 public:
  ListNode* mergeInBetween(ListNode* list1, int a, int b, ListNode* list2) {
    ListNode* nodeBeforeA = list1;
    for (int i = 0; i < a - 1; ++i)
      nodeBeforeA = nodeBeforeA->next;

    ListNode* nodeB = nodeBeforeA->next;
    for (int i = 0; i < b - a; ++i)
      nodeB = nodeB->next;

    nodeBeforeA->next = list2;
    ListNode* lastNodeInList2 = list2;

    while (lastNodeInList2->next != nullptr)
      lastNodeInList2 = lastNodeInList2->next;

    lastNodeInList2->next = nodeB->next;
    nodeB->next = nullptr;
    return list1;
  }
};

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