複選題4.Let A=[20,80,30,40,10,70,50. After executing kkk(A,0,7), which of the following are true? (A) A[0]=70； (B) A[2]=10； (C)A[4]=50]； (D) A[6]=20.

複選題10. We use the linked-based implementation as defined above for the stack. After executing the 10 operations, which of the following are true? (A) first is not O； (B) first contains the address where 5 is stored； (C)Alfirst]=4； (D) A -＞ first = 4.