Status: IN
`sumZero(n)` constructs its result by appending `(i, -i)` pairs for `i` in `[1, n//2]`, plus `0` if `n` is odd — guaranteeing uniqueness, zero-sum, and correct length by construction without tracking a running sum.
Source: entries/2026/06/06/find-n-unique-integers-sum-up-to-zero-solution.md