Why it's Time Limit Exceeded?

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    1. if a pointer is null, it is not false, the following code will still output "Test Pass", instead, use if(head!=NULL)
    head = NULL
    if(head)   // this will output "Test Pass"
      cout << "Test Pass" << endl;
    if(head!=NULL) // this will output nothing
      out << "Test Pass" << endl
    1. i think the for part of your program is wrong, you just link the last listNode to the head which will make a circle, not reverse

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