Given an array A, partition it into two (contiguous) subarrays left and right so that:

Every element in left is less than or equal to every element in right.
left and right are non-empty.
left has the smallest possible size.

Return the length of left after such a partitioning.  It is guaranteed that such a partitioning exists.
 
Example 1:
Input: [5,0,3,8,6]
Output: 3
Explanation: left = [5,0,3], right = [8,6]


Example 2:
Input: [1,1,1,0,6,12]
Output: 4
Explanation: left = [1,1,1,0], right = [6,12]

 

Note:

2 <= A.length <= 30000
0 <= A[i] <= 10^6
It is guaranteed there is at least one way to partition A as described.

```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 = '# n^2 time to look at all subarrays\n# n time to iterate backwards ?\nclass Solution:\n    def partitionDisjoint(self, A: List[int]) -> int:\n        min_right = min(A)\n        max_left = 0\n        \n        min_from_right = []\n        current_min_right = A[-1]\n        for i in range(len(A) - 1, -1, -1):\n            current_min_right = min(A[i], current_min_right)\n            min_from_right.insert(0, current_min_right)\n        \n        for i in range(len(A)):\n            current = A[i]\n            max_left = max(max_left, current)\n            min_right = min_from_right[i + 1] if i < len(A) else 0\n            if max_left <= min_right:\n                return i + 1\n\n#         def check_partitions(a, b):\n#             max_a = 0\n#             for num in a:\n#                 max_a = max(max_a, num)\n#             min_b = maxsize\n#             for num in b:\n#                 min_b = min(min_b, num)\n#             if max_a <= min_b and len(a) > 0 and len(b) > 0:\n#                 return len(a)\n#             return -1\n        \n#         min_left = maxsize\n#         for i in range(1, len(A) + 1):\n#             cand = check_partitions(A[0:i], A[i: len(A)])\n#             if cand != -1:\n#                 min_left = min(min_left, cand)\n        \n#         return min_left\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'partitionDisjoint'
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: 5680