Buggy python submission (verdict: Runtime Error):
from sys import stdin
from itertools import accumulate

stdin = open('sample.txt')


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    A1 = [A[0]]
    for i in range(1, N):
        A1.append(A1[-1] ^ A[i])
    A2 = list(accumulate(A))
    l = 0
    r = 1
    tmp1 = A1[0]
    tmp2 = A2[0]
    count = 0
    while True:
        if (l == N - 1) and (r == N):
            count += 1
            break

        if (r != N) and (tmp1 ^ A[r + 1 - 1] == tmp2 + A[r + 1 - 1]):
            if tmp1 == tmp2:
                count += 1
            r += 1
            tmp1 = tmp1 ^ A[r - 1]
            tmp2 = tmp2 + A[r - 1]
            continue
        else:
            if tmp1 == tmp2:
                count += (r - l - 1)
            tmp1 = tmp1 ^ A[l]
            tmp2 = tmp2 - A[l]
            l += 1

    print(count)


if __name__ == '__main__':
    main()


Fixed submission:
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    A1 = [A[0]]
    for i in range(1, N):
        A1.append(A1[-1] ^ A[i])
    A2 = list(accumulate(A))
    l = 0
    r = 1
    tmp1 = A1[0]
    tmp2 = A2[0]
    count = 0
    while True:
        if (l == N - 1) and (r == N):
            count += 1
            break

        if (r != N) and (tmp1 ^ A[r + 1 - 1] == tmp2 + A[r + 1 - 1]):
            if tmp1 == tmp2:
                count += 1
            r += 1
            tmp1 = tmp1 ^ A[r - 1]
            tmp2 = tmp2 + A[r - 1]
            continue
        else:
            if tmp1 == tmp2:
                count += (r - l - 1)
            tmp1 = tmp1 ^ A[l]
            tmp2 = tmp2 - A[l]
            l += 1

    print(count)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
from sys import stdin
stdin = open('sample.txt')


def main():
    N = int(stdin.readline().rstrip())
    if (N == 1):
        print(1)
        return

    A = [int(x) for x in stdin.readline().rstrip().split()]
    l = 0
    r = 1
    temp1 = A[0]
    temp2 = A[0]
    # print(l + 1, r + 1 - 1)
    count = 1
    r += 1
    temp1 = temp1 ^ A[r - 1]
    temp2 = temp2 + A[r - 1]
    c = 0
    while True:
        if temp1 == temp2:
            # print(l + 1, r + 1 - 1)
            count += 1
            if (r < N) and (temp1 ^ A[r] == temp2 + A[r]):
                c += 1
                r += 1
                temp1 = temp1 ^ A[r - 1]
                temp2 = temp2 + A[r - 1]
            elif l < r - 1:
                temp1 = temp1 ^ A[l]
                temp2 = temp2 - A[l]
                # print(c)
                count += c
                c -= 1
                l += 1
            elif r < N:
                r += 1
                temp1 = temp1 ^ A[r - 1]
                temp2 = temp2 + A[r - 1]
        else:
            if l < r - 1:
                temp1 = temp1 ^ A[l]
                temp2 = temp2 - A[l]
                l += 1
            else:
                if r < N:
                    r += 1
                    temp1 = temp1 ^ A[r - 1]
                    temp2 = temp2 + A[r - 1]
                else:
                    temp1 = temp1 ^ A[l]
                    temp2 = temp2 - A[l]
                    l += 1
        if r == N and l == r - 1:
            # print(l + 1, r + 1 - 1)
            count += 1
            break
    print(count)


if __name__ == '__main__':
    main()


Fixed submission:
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    A1 = [A[0]]
    for i in range(1, N):
        A1.append(A1[-1] ^ A[i])
    A2 = list(accumulate(A))
    l = 0
    r = 1
    tmp1 = A1[0]
    tmp2 = A2[0]
    count = 0
    while True:
        if (l == N - 1) and (r == N):
            count += 1
            break

        if (r != N) and (tmp1 ^ A[r + 1 - 1] == tmp2 + A[r + 1 - 1]):
            if tmp1 == tmp2:
                count += 1
            r += 1
            tmp1 = tmp1 ^ A[r - 1]
            tmp2 = tmp2 + A[r - 1]
            continue
        else:
            if tmp1 == tmp2:
                count += (r - l - 1)
            tmp1 = tmp1 ^ A[l]
            tmp2 = tmp2 - A[l]
            l += 1

    print(count)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    a1 = [A[0]]
    tmp = A[0]
    for i in range(1, N):
        tmp = tmp ^ A[i]
        a1.append(tmp)
    a2 = list(accumulate(A))

    count = 0
    for l in range(N):
        for r in range(l, N):
            s1 = a1[r] ^ (0 if l == 0 else a1[l - 1])
            s2 = a2[r] - (0 if l == 0 else a2[l - 1])
            if (s1 == s2):
                count += 1
            if (s2 > 2 ** 20):
                break
    print(count)


if __name__ == '__main__':
    main()


Fixed submission:
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    A1 = [A[0]]
    for i in range(1, N):
        A1.append(A1[-1] ^ A[i])
    A2 = list(accumulate(A))
    l = 0
    r = 1
    tmp1 = A1[0]
    tmp2 = A2[0]
    count = 0
    while True:
        if (l == N - 1) and (r == N):
            count += 1
            break

        if (r != N) and (tmp1 ^ A[r + 1 - 1] == tmp2 + A[r + 1 - 1]):
            if tmp1 == tmp2:
                count += 1
            r += 1
            tmp1 = tmp1 ^ A[r - 1]
            tmp2 = tmp2 + A[r - 1]
            continue
        else:
            if tmp1 == tmp2:
                count += (r - l - 1)
            tmp1 = tmp1 ^ A[l]
            tmp2 = tmp2 - A[l]
            l += 1

    print(count)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    a1 = [A[0]]
    tmp = A[0]
    for i in range(1, N):
        tmp = tmp ^ A[i]
        a1.append(tmp)
    a2 = list(accumulate(A))
    count = 0
    for l in range(N):
        for r in range(l, N):
            s1 = a1[r] ^ (0 if l == 0 else a1[l - 1])
            s2 = a2[r] - (0 if l == 0 else a2[l - 1])
            if (s1 == s2):
                count += 1
    print(count)


if __name__ == '__main__':
    main()


Fixed submission:
from sys import stdin
from itertools import accumulate


def main():
    N = int(stdin.readline().rstrip())
    A = [int(x) for x in stdin.readline().rstrip().split()]
    A1 = [A[0]]
    for i in range(1, N):
        A1.append(A1[-1] ^ A[i])
    A2 = list(accumulate(A))
    l = 0
    r = 1
    tmp1 = A1[0]
    tmp2 = A2[0]
    count = 0
    while True:
        if (l == N - 1) and (r == N):
            count += 1
            break

        if (r != N) and (tmp1 ^ A[r + 1 - 1] == tmp2 + A[r + 1 - 1]):
            if tmp1 == tmp2:
                count += 1
            r += 1
            tmp1 = tmp1 ^ A[r - 1]
            tmp2 = tmp2 + A[r - 1]
            continue
        else:
            if tmp1 == tmp2:
                count += (r - l - 1)
            tmp1 = tmp1 ^ A[l]
            tmp2 = tmp2 - A[l]
            l += 1

    print(count)


if __name__ == '__main__':
    main()