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https://gateoverflow.in/204109/gate2018-35

WHAT IS THE WAY TO PROVE 2ND ONE ..MEANS HOW TO DO PUSH AND POP?? 

 

I M TRYING LIKE  M-N=P-Q THEN PUSH A THEN POP FROM B  NOW SOME A ARE LEFT THEN DO SAME FOR C AND D SIMILARY C WILL LEFT ..BUT NOW HOW TO COMPARE THEM??

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