A.top--; a[top]=x;
B.a[top]=x; top--;
C.top; a[top]=x;
D.a[top]=x; top;
A.5,4,3,2,1,6
B.3,2,5,4,1,6
C.2,3,5,6,1,4
D.1,4,6,5,2,3
A.5,4,3,2,1,6
B.2,3,5,6,1,4
C.3,2,5,4,1,6
D.1,4,6,5,2,3
A.5,6,4,2,3,1
B.3,4,2,1,6,5
C.3,2,6,1,4,5
D.1,2,5,3,4,6
A.正确
B.错误
A.正确
B.错误
A.(MSP)→A.(SP)+1→SP
B.(SP)+1→SP.(MSP)→A
C.(SP-1)→SP.(MSP)→A
D.(MSP)→A.(SP)-1→SP