Revise paste Untitled

typedef long long ll;
class Solution{
public:
    vector<int> segment_tree;
    vector<int> v;
    void build(int L, int R, int pos) {
        if(L == R) {
            segment_tree[pos] = v[L];
        }
        else {
            int middle = (L + R) / 2;
            build(L, middle, 2 * pos);
            build(middle + 1, R, 2 * pos + 1);
            segment_tree[pos] = segment_tree[2 * pos] ^ segment_tree[2 * pos + 1];
        }
    }
    int query(int L, int R, int pos, int i, int j) {
        // L R  i L R j L R
        if(i <= L and R <= j) {
            return segment_tree[pos];
        }
        if(R < i or j < L) {
            return 0;
            
        }
        int middle = (L + R) / 2;
        return query(L, middle, 2 * pos, i, j) ^ query(middle + 1, R, 2 * pos + 1, i, j);
    }
    vector<int> specialXor(int N, int Q, int a[], vector<int> q[])
    {
        segment_tree.resize(4 * N);
        v.resize(N);
        for(int i = 0; i < N; i++) {
            v[i] = a[i];
        }
        build(0, N - 1, 1);
        vector<int> ret;
        for(int i = 0; i < Q; i++) {
            int si = q[i][0] - 1, sj = q[i][1] - 1;
            ll res = query(0, N - 1, 1, 0, si - 1);
            res ^= query(0, N - 1, 1, sj + 1, N - 1);
            
            ret.push_back(res);
        }
        return ret;
    }
};