题解 | 【模板】序列操作

import sys

def sequence_operations(lst: list[int], num1: int, num2: int = 0, num3: int = 0):
    # list = list
    if num1 == 1:
        lst.append(num2)
    if num1 == 2:
        if list:
            lst.pop()
    if num1 == 3:
        try:
            print(lst[num2])
        except Exception as e:
            print(e)
    if num1 == 4:
        # if num2>=0 and num2 <len(lst):
        lst.insert(num2+1,num3)
    if num1 == 5:
        lst.sort(reverse=False)
    if num1 == 6:
        lst.sort(reverse=True)
    if num1 == 7:
        print(len(lst))
    if num1 == 8:
        for i in lst:
            print(i,end=' ')
        print()


n = 0
num1 = 0
num2 = 0
num3 = 0
lst = []
for line in sys.stdin:
    a = line.split()
    if n == 0:
        n = int(a[0])
        continue
    if len(a) == 1:
        num1 = int(a[0])
        sequence_operations(lst,num1)
    if len(a) == 2:
        num1 = int(a[0])
        num2 = int(a[1])
        sequence_operations(lst,num1,num2)
    if len(a) == 3:
        num1 = int(a[0])
        num2 = int(a[1])
        num3 = int(a[2])
        sequence_operations(lst,num1,num2,num3)


    
    num1 = 0
    num2 = 0
    num3 = 0