Introduction - If you have any usage issues, please Google them yourself
A given program, function fun is the function of the node will not take the lead against the home one-way linked list, that if the original list in the node data field from start to finish were: 2,4,6,8,10, inverse set, the node data field from start to finish were: 10,8,6,4,2. Please fill in the application of an underscore at the right content and to remove the underscore, so that the program reach the right result.