ЕБАНАЯ D

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include<iomanip>
using namespace std;

int n, t, I, totalsum;
vector<int> a, b;


int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> t;
    for (I = 0; I < t; I++) {
        cin >> n;
        a.resize(n);
        b.resize(n);
        totalsum = 0;
        for (int i = 0; i < n; i++) {
            cin >> a[i];
            totalsum += a[i];
            b[i] = a[i];
        }
        reverse(b.begin(), b.end());
        bool fl = 1;
        for (int i = 0; i < n; i++) {
            if (totalsum - a[i] != 0 && abs(a[i] - totalsum) + (n-1) * abs(a[i]) <= 1e9) {
                for (int j = 0; j < n; j++) {
                    if (j == i) {
                        cout << -1 * (totalsum - a[i]) << " ";
                    }
                    else {
                        cout << a[i] << " ";
                    }
                }
                cout << "\n";
                fl = 0;
                break;
            }
        }
        if (fl) {
            if (n % 2 == 0) {
                for (int i = 0; i < n; i++) {
                    if (i < n / 2) {
                        cout << -1 * b[i] << " ";
                    }
                    else {
                        cout << b[i] << " ";
                    }
                }
            }
            else {
                for (int i = 0; i < n; i++) {
                    if (i == n / 2 - 1) {
                        if (a[i] <= a[i + 1] && a[i] <= a[i + 2]) {
                            cout << -1 * (a[i + 1] + a[i + 2]) << " " << a[i] << " " << a[i] << " ";
                        }else if (a[i+1] <= a[i] && a[i + 1] <= a[i + 2]) {
                            cout << a[i+1] << " " << -1 * (a[i] + a[i+2]) << " " << a[i + 1] << " ";
                        }
                        else {
                            cout << a[i + 2] << " " << a[i + 2] << " " << -1 * (a[i + 1] + a[i]) << " ";
                        }
                        i+=2;
                        continue;
                    }
                    if (i < n / 2) {
                        cout << -1 * b[i] << " ";
                    }
                    else {
                        cout << b[i] << " ";
                    }

                }

            }
            cout << "\n";
        }
    }
}