Card game

N = int(input(""))
X = [int(e) for e in input("").split(" ")]

def solve(left, right, x, r):

    if (left, right) in r:
        return r[(left, right)]
    
    if right - left < 3:
        return 0
    elif right - left == 3:
        return x[left+1]
    else:
        output = 0
        
        for i in range(left+1, right-3):
            a, b = left, i
            val = x[i+1]
            c, d = i+3, right

            output = max(output, solve(a, b, x, r) + val + solve(c, d, x, r))
        
        # i = left
        val = x[left+1]
        c, d = left+3, right
        output = max(output, val + solve(c, d, x, r))

        # i = right-3
        a, b = left, right-3
        val = x[right-2]
        output = max(output, solve(a, b, x, r) + val)

        r[(left, right)] = output
        return output

print(solve(0, N, X, {}))

"""
9
2 7 1 1 5 7 4 1 1

Output: 14
"""

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: TIME LIMIT EXCEEDED

Test 6

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 7

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 8

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 9

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 10

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...

Test 15

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 36, in <module>
    print(...