1291B - Array Sharpening - CodeForces Solution

//ifstream fin("INPUT.TXT");
//ofstream fout("OUTPUT.TXT");
//fin.close();
//fout.close();
//cout << fixed << setprecition(6);
#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define ICC ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define str string
#define pb push_back
using namespace std;
void NOK()
{
    ll n, m;
    cin >> n >> m;
    cout << n * m / __gcd(n, m);
}
void zadacha_gradyschasov()
{
    ll n;
    cin >> n;
    ll k = 720 * n / 360;
    cout << "It is " <<  k / 60 << " hours " << k % 60 << " minutes.";
}
void a(){
    ll n;
    cin >> n;
    ll pos = 0, pos1 = 0, a[n + 12] = {};
    for(int i = 0; i < n; i ++){
        cin >> a[i];
    }
    for(int i = 0; i < n; i ++){
        if(a[i] < i){
            break;
        }
        pos = i;
    }
    for(int i = n - 1; i >= 0; i --){
        if(a[i] < n - i - 1){
            break;
        }
        pos1 = i;
    }
    if(pos1 <= pos){
        cout << "YES\n";
    }
    else{
        cout << "NO\n";
    }
}
int main(){
    ICC
    ld t = 1;
    cin >> t;
    while(t --){
        a();
    }
}