Pls help me in finding error

#1
#3

see basically,

nodehead1=NULL;
nodehead2=NULL;

The above statements should lie inside your loop
for(n=0; n<t; n++)
because head1 and head2 should be initialsed for every test case,

Also, the statement inside your function should be
if(a->data<=b->data)

[put an = sign to handle all cases]

make these changes, hope it works!

#4

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