#include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0), cout.tie(0);     int T;     cin >> T;     while (T--) {       int n;       cin >> n;       vector<int> v(n);       for (int i = 0; i < n; i++) {         cin >> v[i];       }       int i;       bool poss = 1;       for (i = 0; i < n; i++)         if (v[i] < i) break;       i--;       for (int j = i; j < n - 1; j++) {         if (v[j + 1] >= v[j]) v[j + 1] = v[j] - 1;         if (v[j + 1] < 0) {           poss = 0;           break;         }       }       if (poss)         cout <<  Yes n ;       else         cout <<  No n ;     }     return 0;   }   