What is the error in my code?

#1


Unable to detect the error in my code

#2

Hey, you should

  1. take input the number of testcases
    int t; cin >>t; while(t–) …
  2. insert at tail (not head)
  3. in merge_list use
    head=h1; (in place of head->data= h1->data;)
    and head=h2;
    Your code will run fine!
#3

done, but why does head = h1 works?

#4

because initially head is not pointing to anyone
so head->data is not correct it may give run time error

#5

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