Quiz: k-sorted-lists has an incorrect constraint

[rikipls]

See the quiz here. The listed constraints are

Constraints:

k == lists.length
0 <= k <= 10^4
0 <= lists[i].length <= 500

10^4 <= lists[i][j] <= 10^4

lists[i] is sorted in ascending order.
The sum of lists[i].length will not exceed 10^4.

Here, a constraint should be "-10^4 <= lists[i][j] <= 10^4" instead of "10^4 <= lists[i][j] <= 10^4"