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- #include <iostream>
- #define _ ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
- using namespace std;
- int n, sum[200005], q, a, b;
- int main()
- {_
- sum[0] = 0;
- cin >> n >> q;
- for (int i = 1; i <= n; i++)
- {
- cin >> a;
- sum[i] = sum[i - 1]^a;
- //cout << sum[i] << endl;
- }
- for (int i = 0; i < q; i++)
- {
- cin >> a >> b;
- a = sum[a - 1]^sum[b];
- cout << a << endl;
- }
- }
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