Problem:
Score : 600 points

Problem Statement

There are N piles of stones. The i-th pile has A_i stones.

Aoki and Takahashi are about to use them to play the following game:

Starting with Aoki, the two players alternately do the following operation:

Operation: Choose one pile of stones, and remove one or more stones from it.

When a player is unable to do the operation, he loses, and the other player wins.

When the two players play optimally, there are two possibilities in this game: the player who moves first always wins, or the player who moves second always wins, only depending on the initial number of stones in each pile.

In such a situation, Takahashi, the second player to act, is trying to guarantee his win by moving at least zero and at most (A_1 - 1) stones from the 1-st pile to the 2-nd pile before the game begins.

If this is possible, print the minimum number of stones to move to guarantee his victory; otherwise, print -1 instead.

Constraints

2 \leq N \leq 300

1 \leq A_i \leq 10^{12}

Input

Input is given from Standard Input in the following format:

N
A_1 \ldots A_N

Output

Print the minimum number of stones to move to guarantee Takahashi's win; otherwise, print -1 instead.

Sample Input 1

2
5 3

Sample Output 1

1

Without moving stones, if Aoki first removes 2 stones from the 1-st pile, Takahashi cannot win in any way.

If Takahashi moves 1 stone from the 1-st pile to the 2-nd before the game begins so that both piles have 4 stones, Takahashi can always win by properly choosing his actions.

Sample Input 2

2
3 5

Sample Output 2

-1

It is not allowed to move stones from the 2-nd pile to the 1-st.

Sample Input 3

3
1 1 2

Sample Output 3

-1

It is not allowed to move all stones from the 1-st pile.

Sample Input 4

8
10 9 8 7 6 5 4 3

Sample Output 4

3

Sample Input 5

3
4294967297 8589934593 12884901890

Sample Output 5

1

Watch out for overflows.

Solution in Python (3.8.2) (judge verdict: Wrong Answer)

def main():
    import sys
    def input(): return sys.stdin.readline().rstrip()
    n = int(input())
    a = list(map(int, input().split()))

    x = 0
    for i in range(2, n):
        x ^= a[i]
    s = a[0]+a[1]
    if (s-x)%2 != 0 or (d:=(s-x)//2)&x != 0 or d < 0 or d > a[0]:
        print(-1)
        return
    k = x.bit_length()
    tmp = 0
    for i in range(k-1, -1, -1):
        if (x >> i) & 1:
            if d ^ (tmp+(1<<i)) <= a[0]:
                tmp += 1<<i
    ans =a[0]-d^tmp
    if ans == a[0]:
        print(-1)
    else:
        print(ans)



if __name__ == '__main__':
    main()