Given an array of integers A, find the sum of min(B), where B ranges over every (contiguous) subarray of A.
Since the answer may be large, return the answer modulo 10^9 + 7.
 
Example 1:
Input: [3,1,2,4]
Output: 17
Explanation: Subarrays are [3], [1], [2], [4], [3,1], [1,2], [2,4], [3,1,2], [1,2,4], [3,1,2,4]. 
Minimums are 3, 1, 2, 4, 1, 1, 2, 1, 1, 1.  Sum is 17.
 
Note:

1 <= A.length <= 30000
1 <= A[i] <= 30000

```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 sumSubarrayMins(self, A):\n    #     n, mod = len(A), 10**9 + 7\n    #     left, right, s1, s2 = [0] * n, [0] * n, [], []\n    #     for i in range(n):\n    #         count = 1\n    #         while s1 and s1[-1][0] > A[i]: count += s1.pop()[1]\n    #         left[i] = count\n    #         s1.append([A[i], count])\n    #     for i in range(n)[::-1]:\n    #         count = 1\n    #         while s2 and s2[-1][0] >= A[i]: count += s2.pop()[1]\n    #         right[i] = count\n    #         s2.append([A[i], count])\n    #     print(left)\n    #     print(right)\n    #     return sum(a * l * r for a, l, r in zip(A, left, right)) % mod\n    def sumSubarrayMins(self, A: List[int]) -> int:\n        n = len(A)\n        l_large = [0] * n\n        l_stack = [(A[0], 0)] # mono increasing\n        r_large = [0] * n\n        r_stack = [(A[n-1], n-1)] # mono increasing\n        for i in range(1, n):\n            while l_stack and A[i] <= l_stack[-1][0]:\n                _, idx = l_stack.pop()\n                l_large[i] = max(l_large[i], i-idx+l_large[idx])\n            else: l_stack.append((A[i], i))     \n            while r_stack and A[n-i-1] < r_stack[-1][0]:\n                _, idx = r_stack.pop()\n                r_large[n-i-1] = max(r_large[n-i-1], idx-(n-i-1)+r_large[idx])\n            else: r_stack.append((A[n-i-1], n-i-1))     \n        return sum((1+l_large[i] + r_large[i] + l_large[i] * r_large[i])*A[i] for i in range(n)) % int(1000000007)'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'sumSubarrayMins'
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: 7182