创建链表 个数 节点 pHead所指向链表的第pos个节点的前面插入一个新的结点，该节点的值是val， 并且pos的值是从1开始-The number of nodes pHead create a list of points to the list in front of the first pos nodes insert a new node, the node' s value is val, and the pos value is from 1

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