Buggy python submission (verdict: Time Limit Exceeded):
import itertools
import os
import sys

import numpy as np

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(2147483647)
INF = float("inf")
IINF = 10 ** 18
MOD = 10 ** 9 + 7

N = int(sys.stdin.readline())
A = list(map(int, sys.stdin.readline().split()))


def gutyocu():
    ans = 0
    for i, j in itertools.combinations_with_replacement(range(N), r=2):
        ans += min(A[i: j + 1])
    return ans


A = np.array(A)
pos = np.zeros(N + 1, dtype=int)
pos[0] = -1
pos[A] = np.arange(N + 1)

ans = 0
lefts = [0] * N
rights = [0] * N
for i in reversed(range(1, N + 1)):
    p = pos[i]
    if p + 1 < N and A[p + 1] > i:
        # 右とつながった
        right = rights[p + 1]
    else:
        right = p
    if p - 1 >= 0 and A[p - 1] > i:
        # 左とつながった
        left = lefts[p - 1]
    else:
        left = p
    lefts[right] = left
    rights[left] = right
    ans += (p - left + 1) * (right - p + 1) * i
print(ans)


Fixed submission:
import itertools
import os
import sys

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(2147483647)
INF = float("inf")
IINF = 10 ** 18
MOD = 10 ** 9 + 7

N = int(sys.stdin.readline())
A = list(map(int, sys.stdin.readline().split()))


def gutyocu():
    ans = 0
    for i, j in itertools.combinations_with_replacement(range(N), r=2):
        ans += min(A[i: j + 1])
    return ans


pos = list(range(N + 1))
pos[0] = -1
for i, a in enumerate(A):
    pos[a] = i

ans = 0
lefts = list(range(N + 1))
rights = list(range(N + 1))
for i in reversed(range(1, N + 1)):
    p = pos[i]
    if p + 1 < N and A[p + 1] > i:
        # 右とつながった
        right = rights[p + 1]
    else:
        right = p
    if p - 1 >= 0 and A[p - 1] > i:
        # 左とつながった
        left = lefts[p - 1]
    else:
        left = p
    lefts[right] = left
    rights[left] = right
    ans += (abs(left - p) + 1) * (abs(right - p) + 1) * i
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import bisect
import heapq
import itertools
import math
import operator
import os
import re
import string
import sys
from collections import Counter, deque, defaultdict
from copy import deepcopy
from decimal import Decimal
from fractions import gcd
from functools import lru_cache, reduce
from operator import itemgetter, mul, add, xor

import numpy as np

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(2147483647)
INF = float("inf")
IINF = 10 ** 18
MOD = 10 ** 9 + 7

N = int(sys.stdin.readline())
A = list(map(int, sys.stdin.readline().split()))


def gutyocu():
    ans = 0
    for i, j in itertools.combinations_with_replacement(range(N), r=2):
        ans += min(A[i: j + 1])
    return ans


A = np.array(A)
pos = np.arange(N + 1)
pos[0] = -1
pos[A] = np.arange(N + 1)

ans = 0
lefts = np.arange(N)
rights = np.arange(N)
for i in reversed(range(1, N + 1)):
    p = pos[i]
    if p + 1 < N and A[p + 1] > i:
        # 右とつながった
        right = rights[p + 1]
    else:
        right = p
    if p - 1 >= 0 and A[p - 1] > i:
        # 左とつながった
        left = lefts[p - 1]
    else:
        left = p
    lefts[right] = left
    rights[left] = right
    ans += (abs(left - p) + 1) * (abs(right - p) + 1) * i
print(ans)


Fixed submission:
import itertools
import os
import sys

if os.getenv("LOCAL"):
    sys.stdin = open("_in.txt", "r")

sys.setrecursionlimit(2147483647)
INF = float("inf")
IINF = 10 ** 18
MOD = 10 ** 9 + 7

N = int(sys.stdin.readline())
A = list(map(int, sys.stdin.readline().split()))


def gutyocu():
    ans = 0
    for i, j in itertools.combinations_with_replacement(range(N), r=2):
        ans += min(A[i: j + 1])
    return ans


pos = list(range(N + 1))
pos[0] = -1
for i, a in enumerate(A):
    pos[a] = i

ans = 0
lefts = list(range(N + 1))
rights = list(range(N + 1))
for i in reversed(range(1, N + 1)):
    p = pos[i]
    if p + 1 < N and A[p + 1] > i:
        # 右とつながった
        right = rights[p + 1]
    else:
        right = p
    if p - 1 >= 0 and A[p - 1] > i:
        # 左とつながった
        left = lefts[p - 1]
    else:
        left = p
    lefts[right] = left
    rights[left] = right
    ans += (abs(left - p) + 1) * (abs(right - p) + 1) * i
print(ans)