Alex and Lee continue their games with piles of stones.  There are a number of piles arranged in a row, and each pile has a positive integer number of stones piles[i].  The objective of the game is to end with the most stones. 
Alex and Lee take turns, with Alex starting first.  Initially, M = 1.
On each player's turn, that player can take all the stones in the first X remaining piles, where 1 <= X <= 2M.  Then, we set M = max(M, X).
The game continues until all the stones have been taken.
Assuming Alex and Lee play optimally, return the maximum number of stones Alex can get.
 
Example 1:
Input: piles = [2,7,9,4,4]
Output: 10
Explanation:  If Alex takes one pile at the beginning, Lee takes two piles, then Alex takes 2 piles again. Alex can get 2 + 4 + 4 = 10 piles in total. If Alex takes two piles at the beginning, then Lee can take all three piles left. In this case, Alex get 2 + 7 = 9 piles in total. So we return 10 since it's larger. 

 
Constraints:

1 <= piles.length <= 100
1 <= piles[i] <= 10 ^ 4

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'class Solution:\n    def stoneGameII(self, piles: List[int]) -> int:\n        N = len(piles)\n        suffix_sum = [0] * N\n        \n        running_sum = 0\n        for idx in range(N-1, -1, -1):\n            running_sum += piles[idx]\n            suffix_sum[idx] = running_sum\n            \n        DP = [[0]*(N+1) for _ in range(N+1)]\n        \n        for pile_no in reversed(list(range(N))):\n            for M in reversed(list(range(N))):\n                min_next_player = suffix_sum[pile_no]\n                for x in range(1, min(2*M + 1, N+1)):\n                    if pile_no + x < N:\n                        min_next_player = min(min_next_player, DP[pile_no + x][max(x,M)])\n                    else:\n                        min_next_player = 0\n                DP[pile_no][M] = suffix_sum[pile_no] - min_next_player\n            \n        return DP[0][1]\n        \n#         # @lru_cache(None)\n#         def dfs(pile_no, M):\n#             if pile_no > N-1:\n#                 return 0\n#             if DP[pile_no][M] > 0:\n#                 return DP[pile_no][M]\n#             min_next_player = suffix_sum[pile_no]\n#             for x in range(1, min(2*M + 1, N+1)):\n#                 min_next_player = min(min_next_player, dfs(pile_no + x, max(x,M)))\n                \n#             DP[pile_no][M] = suffix_sum[pile_no] - min_next_player\n#             return DP[pile_no][M]\n            \n#         return dfs(0, 1)\n        \n            \n        \n        \n        \n        \n            \n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'stoneGameII'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 7012