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

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
    int t;
	cin >> t;
    rep(ti, 0, t) {
        int n;
        cin >> n;
        vector<ll> a(n);
        rep(i, 0, n) cin>> a[i];
        int d = -1;
        vector<int> v;
        v.push_back(0);
        string ans = "Yes";
        rep(i, 0, n - 1) {
            if(d < 0) {
                if(a[i] < a[i + 1]) {
                    v.push_back(i);
                    int sz = v.size();
                    if(v.back() - v[sz - 2] < 1) {
                        ans = "No";
                        break;
                    }
                    d = 1;
                 }
            }
            else {
                if(a[i] > a[i + 1]) {
                    v.push_back(i);
                    int sz = v.size();
                    if(v.back() - v[sz - 2] < 1) {
                        ans = "No";
                        break;
                    }
                    d = -1;
                 }
            }
        }
        int sz = v.size();
        if(sz != 4) ans = "No";
        cout << ans << endl;
    }
}