1304. Find N Unique Integers Sum up to Zero

Given an integer n, return any array containing n unique integers such that they add up to 0.

class Solution {
public:
    vector<int> sumZero(int n) {
        vector<int> res;
        for(int i = 0; i < n / 2; i++) {
            res.push_back(i+1);
            res.push_back(-i-1);
        }
        if(n & 1) res.push_back(0);
        return res;
    }
};