from collections.abc import Sequence
class Vec(Sequence):
x: list[int]
def __init__(self):
self.x = []
def __getitem__(self, i: int) -> int:
return self.x[i]
def __iter__(self):
return iter(self.x)
def __len__(self) -> int:
return len(self.x)
def __contains__(self, i: int) -> bool:
return i in self.x