def f(arr):
    n,m = 0,len(arr)-1
    while n+arr[n]<m:
        new_arr = list(arr[n:n+arr[n]+1])
        new_ind = ''.join([str(i) for i in new_arr]).rfind(str(max(new_arr)))+n
        if new_ind == n:
            a=list(new_arr[1:])
            new_ind = ''.join([str(i) for i in a]).rfind(str(max(a)))+n+1
            if a[new_ind-n-1] == 0:
                return False
        n = new_ind
    return True

print(f([2,5,3,1,0,0,1,0,2]))