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Question

Making the pop operation costly, select the code snippet which implements the same.
a)

public int pop()
{
 int res=-999,count=0;
 if(q1.size()>0)
        {
  count = q1.size();
  while(count>0)
   q2.offer(q1.poll());
  res = q1.poll();
 }
 if(q2.size()>0)
        {
  count = q2.size();
  while(count>0)
   q1.offer(q2.poll());
  res = q2.poll();
 }
 return res;
}

b)

public int pop()
{
 int res=-999,count=0;
 if(q1.size()>0)
        {
  count = q1.size();
  while(count>1)
   q2.offer(q1.poll());
  res = q2.poll();
 }
 if(q2.size()>0)
        {
  count = q2.size();
  while(count>1)
   q1.offer(q2.poll());
  res = q1.poll();
 }
 return res;
}

c)

public int pop()
{
 int res=-999,count=0;
 if(q1.size()>0)
        {
  count = q1.size();
  while(count>1)
   q2.offer(q1.poll());
  res = q1.poll();
 }
 if(q2.size()>0)
        {
  count = q2.size();
  while(count>1)
   q1.offer(q2.poll());
  res = q2.poll();
 }
 return res;
}

d) None of the mentioned

a.

a

b.

b

c.

c

d.

d

Answer: (c).c

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Q. Making the pop operation costly, select the code snippet which implements the same.

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