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單向連結串列反轉,k個一組

有連結串列1 2 3 4 5 6 7 8 ,3個一組反轉結果:3 2 1 6 5 4 8 7

Node* KNodeReverse(Node* root,int k)
{
	Node *cur,*pre,*next;//必須有三個臨時指標,因為cur需要知道連線的物件,同時不丟失它的下個物件
	cur = root;
	pre = nullptr;

	Node* revRoot = new Node(0);//新建一個節點作為起點,返回前再delete
	Node* first;
	Node* connect = revRoot;
	while(cur)
	{
		int n = k;
		first = cur;
		while(n-- && cur)
		{
			next = cur->pNext;
			cur->pNext = pre;
			pre = cur;
			cur = next;
		}
		connect->pNext = pre;
		connect = first;	
	}

	Node *tempt = revRoot;
	revRoot = revRoot->pNext;
	delete tempt;
	return revRoot;
}