题解 | 【模板】序列操作

import sys

res = []
for line in sys.stdin:
    a = line.split()
    if int(a[0]) == 1:
        res.append(int(a[1]))
    elif int(a[0]) == 2:
        if len(res) >= 1:
            res.pop()
    elif int(a[0]) == 3:
        print(int(res[int(a[1])]))
    elif int(a[0]) == 4:
        res.insert(int(a[1])+1, int(a[2]))
    elif int(a[0]) == 5:
        res = sorted(res)
    elif int(a[0]) == 6:
        res = sorted(res, reverse=True)
    elif int(a[0]) == 7:
        print(len(res))
    elif int(a[0]) == 8:
            print(*res)