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??