LinkedListNode* mergeLists(LinkedListNode* a, LinkedListNode *b){
// assumes length a >= length b
LinkedListNode *curNode=a, *nextNode=b, *nextNextNode;
while(curNode != NULL && nextNode!=NULL){
nextNextNode = curNode->next;
curNode->next = nextNode;
curNode = nextNode;
nextNode = nextNextNode;
}
return a;
}
LinkedListNode* reverseList(LinkedListNode* a){
LinkedListNode *head = NULL, *curNode=a, *nextNode;
while(curNode!=NULL){
nextNode = curNode->next;
curNode->next = head;
head = curNode;
curNode = nextNode;
}
return head;
}
LinkedListNode* getLowerMiddleNode(LinkedListNode* a){
LinkedListNode *singleJump=a, *doubleJump = a;
while(doubleJump->next != NULL && doubleJump->next->next != NULL){
singleJump = singleJump->next;
doubleJump = doubleJump->next->next;
}
return singleJump;
}
LinkedListNode* reverseZigZagMerge(LinkedListNode* a){
if(a == NULL) return NULL;
LinkedListNode *lowerMiddelNode = getLowerMiddleNode(a);
LinkedListNode *secondHalf = lowerMiddelNode->next;
lowerMiddelNode->next = NULL;
return mergeLists(a,reverseList(secondHalf));
}
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