Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

N = int(input())
slime = list(map(int, input().split()))
cumSlime = [0] * (N + 1)
for i in range(1, N + 1):
    cumSlime[i] = cumSlime[i - 1] + slime[i - 1]

def calc(qLeft, qRight):
    st = deque([(False, qLeft, qRight)])
    memo = dict()

    while st:
        canCalc, left, right = st.pop()

        if left + 1 == right:
            memo[(left, right)] = slime[left]
            continue

        if (left, right) in memo:
            continue

        if canCalc:
            ret = float('inf')
            for mid in range(left + 1, right):
                ret = min(ret, memo[(left, mid)] + memo[(mid, right)])
            ret += cumSlime[right] - cumSlime[left]
            memo[(left, right)] = ret
        else:
            st.append((True, left, right))
            for mid in range(left + 1, right):
                if not (left, mid) in memo:
                    st.append((False, left, mid))
                if not (mid, right) in memo:
                    st.append((False, mid, right))

    return memo[(qLeft, qRight)]

ans = calc(0, N) - sum(slime)
print(ans)

Fixed submission:
import numpy as np

N = int(input())
A = np.array(input().split(), np.int64)

Acum = np.zeros((N, N + 1), dtype=np.int64)
for i in range(N):
    Acum[i, i + 1:] = A[i:].cumsum()

dp = np.zeros((N, N + 1), dtype=np.int64)

for length in range(2, N + 1):
    for left in range(N - length + 1):
        right = left + length
        dp[left, right] = (dp[left, left + 1: right] + dp[left + 1: right, right]).min() + Acum[left, right]

print(dp[0, N])

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

N = int(input())
slime = list(map(int, input().split()))
cumSlime = [0] * (N + 1)
for i in range(1, N + 1):
    cumSlime[i] = cumSlime[i - 1] + slime[i - 1]

def calc(qLeft, qRight):
    st = deque([(False, qLeft, qRight)])
    memo = dict()

    while st:
        canCalc, left, right = st.pop()

        if left + 1 == right:
            memo[(left, right)] = slime[left]
            continue

        if (left, right) in memo:
            continue

        if canCalc:
            ret = float('inf')
            for mid in range(left + 1, right):
                ret = min(ret, memo[(left, mid)] + memo[(mid, right)])
            ret += cumSlime[right] - cumSlime[left]
            memo[(left, right)] = ret
        else:
            st.append((True, left, right))
            for mid in range(left + 1, right):
                if not (left, mid) in memo:
                    st.append((False, left, mid))
                if not (mid, right) in memo:
                    st.append((False, mid, right))

    return memo[(qLeft, qRight)]

ans = calc(0, N) - sum(slime)
print(ans)

Fixed submission:
import numpy as np

N = int(input())
A = np.array(input().split(), np.int64)

Acum = np.zeros((N, N + 1), dtype=np.int64)
for i in range(N):
    Acum[i, i + 1:] = A[i:].cumsum()

dp = np.zeros((N, N + 1), dtype=np.int64)

for length in range(2, N + 1):
    for left in range(N - length + 1):
        right = left + length
        dp[left, right] = (dp[left, left + 1: right] + dp[left + 1: right, right]).min() + Acum[left, right]

print(dp[0, N])

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

N = int(input())
slime = list(map(int, input().split()))
cumSlime = [0] * (N + 1)
for i in range(1, N + 1):
    cumSlime[i] = cumSlime[i - 1] + slime[i - 1]

def calc(qLeft, qRight):
    st = deque([(False, qLeft, qRight)])
    memo = dict()

    while st:
        canCalc, left, right = st.pop()

        if canCalc:
            if left + 1 == right:
                memo[(left, right)] = slime[left]
                continue
            ret = float('inf')
            for mid in range(left + 1, right):
                ret = min(ret, memo[(left, mid)] + memo[(mid, right)])
            ret += cumSlime[right] - cumSlime[left]
            memo[(left, right)] = ret
        else:
            st.append((True, left, right))
            if left + 1 == right:
                continue
            for mid in range(left + 1, right):
                if not (left, mid) in memo:
                    st.append((False, left, mid))
                if not (mid, right) in memo:
                    st.append((False, mid, right))

    return memo[(qLeft, qRight)]

ans = calc(0, N) - sum(slime)
print(ans)

Fixed submission:
import numpy as np

N = int(input())
A = np.array(input().split(), np.int64)

Acum = np.zeros((N, N + 1), dtype=np.int64)
for i in range(N):
    Acum[i, i + 1:] = A[i:].cumsum()

dp = np.zeros((N, N + 1), dtype=np.int64)

for length in range(2, N + 1):
    for left in range(N - length + 1):
        right = left + length
        dp[left, right] = (dp[left, left + 1: right] + dp[left + 1: right, right]).min() + Acum[left, right]

print(dp[0, N])