Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
a = tuple(map(int, input().split()))

def main():
    l = [[0] * N for _ in range(N)]
    for i in range(N):
        for j in range(N):
            if i + j >= N:
                continue
            s = j
            e = j + i
            if len(a) % 2 != i % 2:
                if i == 0:
                    l[s][e] = a[s]
                elif i == 1:
                    l[s][e] = max(a[s:e+1]) - min(a[s:e+1])
                else:
                    l[s][e] = max(a[s] + l[s+1][e], a[e] + l[s][e-1])
            else:
                if i == 0:
                    l[s][e] -= a[s]
                elif i == 1:
                    l[s][e] = min(a[s:e+1]) - max(a[s:e+1])
                else:
                    l[s][e] = min(l[s+1][e] - a[s], l[s][e-1] - a[e])


    return l[0][-1]
print(main())


Fixed submission:
N = int(input())
a = tuple(map(int, input().split()))

def main():
    l = [[0] * N for _ in range(N)]
    for i in range(N):
        for j in range(N):
            if i + j >= N:
                continue
            s = j
            e = j + i
            if len(a) % 2 != i % 2:
                if i == 0:
                    l[s][e] = a[s]
                elif i == 1:
                    l[s][e] = max(a[s:e+1]) - min(a[s:e+1])
                else:
                    l[s][e] = max(a[s] + l[s+1][e], a[e] + l[s][e-1])
            else:
                if i == 0:
                    l[s][e] -= a[s]
                elif i == 1:
                    l[s][e] = min(a[s:e+1]) - max(a[s:e+1])
                else:
                    l[s][e] = min(l[s+1][e] - a[s], l[s][e-1] - a[e])


    return l[0][-1]
print(main())

Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(10000000)
from collections import deque
N = int(input())
a = deque(map(int, input().split()))

def main():
    x, y = dfs(a, 0, 0, True)
    return x - y
def dfs(a, x, y, xturn):
    if len(a) == 1:
        if xturn:
            x += a[0]
        else:
            y += a[0]
        return x, y
    elif len(a) == 2:
        if xturn:
           x += max(a)
           y += min(a)
        else:
            y += max(a)
            x += min(a)
        return x, y
    c1a = a.copy()
    c2a = a.copy()
    c1 = c1a.pop()
    c2 = c2a.popleft()
    if xturn:
        x1, y1 = dfs(c1a, x + c1, y, not xturn)
        x2, y2 = dfs(c2a, x + c2, y, not xturn)
        if x1 > x2:
            return x1, y1
        return x2, y2
    else:
        x1, y1 = dfs(c1a, x, y + c1, not xturn)
        x2, y2 = dfs(c2a, x, y + c2, not xturn)
        if y1 > y2:
            return x1, y1
        return x2, y2
print(main())


Fixed submission:
N = int(input())
a = tuple(map(int, input().split()))

def main():
    l = [[0] * N for _ in range(N)]
    for i in range(N):
        for j in range(N):
            if i + j >= N:
                continue
            s = j
            e = j + i
            if len(a) % 2 != i % 2:
                if i == 0:
                    l[s][e] = a[s]
                elif i == 1:
                    l[s][e] = max(a[s:e+1]) - min(a[s:e+1])
                else:
                    l[s][e] = max(a[s] + l[s+1][e], a[e] + l[s][e-1])
            else:
                if i == 0:
                    l[s][e] -= a[s]
                elif i == 1:
                    l[s][e] = min(a[s:e+1]) - max(a[s:e+1])
                else:
                    l[s][e] = min(l[s+1][e] - a[s], l[s][e-1] - a[e])


    return l[0][-1]
print(main())

Buggy python submission (verdict: Runtime Error):
from collections import deque
N = int(input())
a = deque(map(int, input().split()))

def main():
    x, y = dfs(a, 0, 0, True)
    return x - y
def dfs(a, x, y, xturn):
    if len(a) == 1:
        if xturn:
            x += a[0]
        else:
            y += a[0]
        return x, y
    elif len(a) == 2:
        if xturn:
           x += max(a)
           y += min(a)
        else:
            y += max(a)
            x += min(a)
        return x, y
    c1a = a.copy()
    c2a = a.copy()
    c1 = c1a.pop()
    c2 = c2a.popleft()
    if xturn:
        x1, y1 = dfs(c1a, x + c1, y, not xturn)
        x2, y2 = dfs(c2a, x + c2, y, not xturn)
        if x1 > x2:
            return x1, y1
        return x2, y2
    else:
        x1, y1 = dfs(c1a, x, y + c1, not xturn)
        x2, y2 = dfs(c2a, x, y + c2, not xturn)
        if y1 > y2:
            return x1, y1
        return x2, y2
print(main())


Fixed submission:
N = int(input())
a = tuple(map(int, input().split()))

def main():
    l = [[0] * N for _ in range(N)]
    for i in range(N):
        for j in range(N):
            if i + j >= N:
                continue
            s = j
            e = j + i
            if len(a) % 2 != i % 2:
                if i == 0:
                    l[s][e] = a[s]
                elif i == 1:
                    l[s][e] = max(a[s:e+1]) - min(a[s:e+1])
                else:
                    l[s][e] = max(a[s] + l[s+1][e], a[e] + l[s][e-1])
            else:
                if i == 0:
                    l[s][e] -= a[s]
                elif i == 1:
                    l[s][e] = min(a[s:e+1]) - max(a[s:e+1])
                else:
                    l[s][e] = min(l[s+1][e] - a[s], l[s][e-1] - a[e])


    return l[0][-1]
print(main())