Why this is wrong?

```
def random_subset(n: int, k: int) -> List[int]:
H = {}
for i in range(k):
r = random.randrange(i, n)
if r in H:
H[i] = H[r], i
else:
H[i] = r, i
return [H[i] for i in range(k)]
```

Also, why can’t I do this? This also wrong.

```
def random_subset(n: int, k: int) -> List[int]:
H = {}
for i in range(k):
r = random.randrange(i, n)
H[r] = H.get(i, i)
H[i] = H.get(r, r)
return [H[i] for i in range(k)]
```