/* Problem URL: https://codeforces.com/problemset/problem/1980/D */ #include #include #include using namespace std; using namespace __gnu_pbds; template > using ordered_set = tree; #define V vector #define rmin(a, b) a = min(a, b) #define rmax(a, b) a = max(a, b) #define rep(i, lim) for (int i = 0; i < (lim); i++) #define nrep(i, s, lim) for (int i = s; i < (lim); i++) #define repv(i, v) for (auto &i : (v)) #define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; } #define sortv(v) sort(v.begin(), v.end()) #define all(v) (v).begin(), (v).end() using vi = vector; using vvi = vector; using vvvi = vector; using vvvvi = vector; using ll = long long; using vl = vector; using vvl = vector; using vvvl = vector; using vvvvl = vector; template auto operator<<(ostream &os, const vector &vec)->ostream& { os << vec[0]; for (size_t i = 1; i < vec.size(); i++) { os << ' ' << vec[i]; } os << '\n'; return os; } template auto operator>>(istream &is, vector &vec)->istream& { for (auto &i : vec) { is >> i; } return is; } template auto operator<<(ostream &os, const vector> &vec)->ostream& { for (auto &i : vec) { os << i[0]; for (size_t j = 1; j < i.size(); j++) { os << ' ' << i[j]; } os << '\n'; } return os; } template auto operator>>(istream &is, vector> &vec)->istream& { for (auto &i : vec) { for (auto &j : i) { is >> j; } } return is; } const int oo = INT32_MAX >> 1; const ll OO = INT64_MAX >> 1; void pre() { } #define TEST 1 void solve() { int n; cin >> n; vl a(n); cin >> a; int wrong = -1; nrep(i, 1, n - 1) { ll cur = gcd(a[i], a[i + 1]); ll prev = gcd(a[i - 1], a[i]); if (cur < prev) { wrong = i; break; } } if (wrong != -1) { vl one(n - 1); vl two(n - 1); vl three(n - 1); int cur1 = 0; int cur2 = 0; int cur3 = 0; rep(i, n) { if (i != wrong - 1) { one[cur1] = a[i]; cur1++; } if (i != wrong) { two[cur2] = a[i]; cur2++; } if (i != wrong + 1) { three[cur3] = a[i]; cur3++; } } auto test = [&](vl &now) { nrep(i, 1, now.size() - 1) { ll cur = gcd(now[i], now[i + 1]); ll prev = gcd(now[i], now[i - 1]); if (prev > cur) { return false; } } return true; }; if (!test(one) && !test(two) && !test(three)) { cout << "NO\n"; return; } } cout << "YES\n"; } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); pre(); int t; (TEST && cin >> t) || (t = 1); while (t--) { solve(); } }