#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;

using ll = int64_t;
using ul = uint64_t;
using ld = long double;
using vi = vector<int>;
using vd = vector<double>;
using vc = vector<char>;
using vs = vector<string>;
using vb = vector<bool>;
using vl = vector<ll>;
using vvi = vector<vi>;
using vvd = vector<vd>;
using vvc = vector<vc>;
using vvb = vector<vb>;
using vvl = vector<vl>;
using mint = modint998244353;
using vm = vector<mint>;

void solve() {
  int N;
  cin >> N;
  vi H(N);
  for (int i = 0; i < N; i++) {
    cin >> H[i];
  }
  if (H[0] < H[1] || H[N - 2] > H[N - 1]) {
    cout << "No" << endl;
    return;
  }
  int cnt = 0;
  for (int i = 1; i < N - 1; i++) {
    if (H[i - 1] < H[i] && H[i + 1] < H[i]) cnt++;
    if (H[i - 1] > H[i] && H[i + 1] > H[i]) cnt++;
  }
  if (cnt == 3) cout << "Yes" << endl;
  else cout << "No" << endl;
  return;
}

int main() {
  int T;
  cin >> T;
  for (int i = 0; i < T; i++) {
    solve();
  }
  return 0;
}