Xor sum

buffer = input().split()
n = int(buffer[0])
q = int(buffer[1])
values = list(map(int,input().split()))

for _ in range(q):
    query = input().split()
    a = int(query[0]) - 1
    b = int(query[1]) - 1

    res = values[b]
    for i in range(a,b):
        res = res ^ values[i]
    print(res)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED