MadeEasy Workbook

Question

https://gateoverflow.in/?qa=blob&qa_blobid=11435838562783483664

Approach for Q9 please .

(Please note: it is the last question on left hand side, and part of it is written on right hand side)

Answer is d, but according to me it should be b as in 3 situation when C is a queue and D is a stack, then it will count the no. Of elements but won't be restored in it's original state as mentioned in question. 

So only 1 and 2 is possible.

Is it correct?

Comments

I think, you are right

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@ manvi_agarwal, yes, you are right.... only 1 and 2 leads correct restoration but 3 leads to reverse restoration.

 

OBSERVATION :-

4) C is a stack and D is a Queue, ===> it also leads reverse restoration

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answer is correct, acc to answer key, but how is it possible? can u please elaborate?

firstly, 3 statement says C is queue and D is stack, so when elements stored in queue be 1,2,3,4 (left to right) on deleting and pushing to stack will be stored in the form 1,2,3,4 (bottom to up) then after counting the elements, we have to restore the state for which we popped the elements from stack one after the other in the form (4,3,2,1)starting from 4, and pushing back into the queue, we get the queue in the reverse order which is 4,3,,2,1 (left to right)

hence not able to restore state with this combination

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answer is correct, acc to answer key, but how is it possible? can u please elaborate?

who says? Do you believe there is no mistakes in made easy manual or test series ? 

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yes! i agree, where am i wrong in this explaination?can u justify, after restoring it is not coming to the same stage

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you didn't did any wrong...

read my first comment

Answer 1

As per I think ans is D ...

1 : C -> D -> C

2:  C -> D -> C

3:  C -> D -> C (element wise)