Xor sum

#include "iostream"

int main() {
    int n, q;
    std::cin >> n >> q;
    int array[n];
    int sums[n];
    for (int i = 0; i < n; i++) {
        std::cin >> array[i];
        if (i) sums[i] = sums[i - 1] ^ array[i];
        else sums[i] = array[i];
    }
    int a, b;
    for (int i = 0; i < q; i++) {
        std::cin >> a >> b;
        std::cout << sums[b] - sums[a] << std::endl;
    }
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER