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#include <cassert>
#include <iostream>
#include <vector>
std::vector<int> unique_sum_zero(int n) {
std::vector<int> v;
if (n % 2) {
v = {0};
}
for (int i = 1; i <= n / 2; ++i) {
v.insert(v.end(), {i, -i});
}
return v;
}
int main(int argc, char* argv[]) {
auto u1 = unique_sum_zero(1);
assert(u1.size() == 1);
assert(u1[0] == 0);
auto u2 = unique_sum_zero(2);
assert(u2.size() == 2);
assert(u2[0] == 1);
assert(u2[1] == -1);
auto u3 = unique_sum_zero(3);
assert(u3.size() == 3);
assert(u3[0] == 0);
assert(u3[1] == 1);
assert(u3[2] == -1);
auto u4 = unique_sum_zero(4);
assert(u4.size() == 4);
assert(u4[0] == 1);
assert(u4[1] == -1);
assert(u4[2] == 2);
assert(u4[3] == -2);
std::cout << "Ok." << std::endl;
}
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