The code is giving runtime error

#1


this is the link to the code which I attempted but it gives runtime error
Can you please help me correct it

#2

Hey @prerna_gupta31

Node*a=l1,*b=l2;//SAVE HERE
   int c1 = 0,c2 = 0;
   while(l1!=NULL)
   {
       c1++;
       l1 = l1->next; 
   }
   
   while(l2!=NULL)
   {
       c2++;
       l2 = l2->next; 
   }
   l1=a,l2=b;//REINITIALIZE HERE because above loops made them null