9．将a,b,c,d,e,f,g 六个元素一次存放入堆栈,则写面那一个不可能是该堆栈元素的出栈序列：( )A)a,b,c,d,e,f,g B)a,c,b,d,f,e,g C)c,b,a,f,e,d ,g D)d,e ,a,c,b,f,g

9．将a,b,c,d,e,f,g 六个元素一次存放入堆栈,则写面那一个不可能是该堆栈元素的出栈序列：( )
A)a,b,c,d,e,f,g B)a,c,b,d,f,e,g
C)c,b,a,f,e,d ,g D)d,e ,a,c,b,f,g

d
d项d,e都出来后不可能出来a
此时栈中只有a,b,c,要么出来c要么放进去再拿出来f

D

d
d项d,e都出来后不可能出来a
此时栈中只有a,b,c,要么出来c要么放进去再拿出来f

g
g项g,d都出来后不可能出来a
此时栈中只有a,b,c,要么出来c要么放进去再拿出来f

abc

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