题目
第2题
A.push,pop,push,pop,push,pop
B.push,push,push,pop,pop,pop
C.push,push,pop,pop,push,pop
D.push,pop,push,push,pop,pop
第3题
A.push,pop,push,pop,push,pop
B.push, push, push, pop, pop, pop
C.push, push,pop, pop,push,pop
D.push,pop,push, push,pop, pop
第4题
A.push,pop,push,pop,push,pop
B.push,push,push,pop,pop,pop
C.push,push,pop,pop,push,pop
D.push,pop,push,push,pop,pop
第5题
A.push,pop,push,pop,push,pop
B.push, push, push, pop, pop, pop
C.push, push,pop, pop,push,pop
D.push,pop,push, push,pop, pop
第6题
A.push push push pop pop pop
B.push push pop push pop pop
C.push pop push pop push pop
D.push pop push push pop pop
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