Xor sum

#include <iostream>
#include <vector>
#include <ranges>
#include <math.h>
using namespace std;

int parent(int node) {
    return node / 2;
}

int left(int node) {
    return 2 * node;
}

int right(int node) {
    return 2 * node + 1;
}

int getXorSum(int a, int b, vector<int>& arr) {
    int n = arr.size() / 2;
    a += n; b += n;
    int sumVal = 0;
    while (a <= b) {
        if (a%2 == 1) {
            sumVal = sumVal ^ arr[a];
            a++;
        }
        if (b%2 == 0) {
            sumVal = sumVal ^ arr[b];
            b--;
        }
        a = parent(a);
        b = parent(b);
    }
    return sumVal;
}

int main() {
    int n, q;
    cin >> n >> q;

    int elems = 1 << (int)ceil(log2(n));
    vector<int> tree(2*elems);

    for (int i=0; i<n; i++) {
        cin >> tree[i + elems];
    }

    for (int i=n; i<elems; i++) {
        tree[i + elems] = 0;
    }

    for (int i=elems-1; i>0; i--) {
        tree[i] = tree[left(i)] ^ tree[right(i)];
    }

    int a, b;
    for (int i=0; i<q; i++) {
        cin >> a >> b;
        cout << getXorSum(a-1, b-1, tree) << endl;
    }

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED