题解 | 【模板】序列操作

seq=[]
num=int(input())
for _ in range(num):
    parts=input().split()
    op=int(parts[0])
    if op==1:
        x=int(parts[1])
        seq.append(x)
    elif op==2:
        seq.pop()
    elif op==3:
        i=int(parts[1])
        print(seq[i])
    elif op==4:
        i=int(parts[1])
        x=int(parts[2])
        seq.insert(i+1,x)
    elif op==5:
        seq.sort()
    elif op==6:
        seq.sort(reverse=True)
    elif op==7:
        print(len(seq))
    elif op==8:
        print(' '.join(map(str,seq)))