Xor sum

n_count, q_count = map(int, input().split())
n = list(map(int, input().split()))
q = [list(map(int, input().split())) for _ in range(q_count)]


for i in range(q_count):
    sum = n[q[i][0] - 1]

    for j in range(q[i][0], q[i][1]):
        sum ^= n[j]

    print(sum)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED