题目
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1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,push,push,pop,pop,pop
B.push,pop,push,pop,push,pop
C.push,push,pop,pop,push,pop
D.push,pop,push,push,pop,pop
第5题
A.push,push,push,pop,pop,pop
B.push,pop,push,pop,push,pop
C.push,push,pop,pop,push,pop
D.push,pop,push,push,pop,pop
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