- zouqize's blog
代码云盘
- 2025-2-6 16:19:39 @
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n;
int main()
{
cin >> n;
for(ll i = 0 ; i < n ; ++i)
{
ll num,input;
ll minN = 1e18,min_num;
cin >> num;
bool ans = 1;
for(ll j = 1 ; j <= num ; ++j)
{
cin >> input;
ll a = max((j-1)*2,(num-j)*2);
if(a >= input || a == 1)
{
ans = 0;
}
}
if(ans) cout << "YES" << endl;
else cout << "NO" << endl;
}
return 0;
}