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https://git.sb/baoshuo/OI-codes.git
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76 lines
1.4 KiB
C++
76 lines
1.4 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <tuple>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e6 + 5;
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int n, m, k, a[N], t;
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long long c[N], ans[N];
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std::vector<std::tuple<int, int, int>> q;
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void add(int x, long long &res) {
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res += c[x ^ k];
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c[x]++;
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}
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void del(int x, long long &res) {
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c[x]--;
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res -= c[x ^ k];
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m >> k;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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a[i] = a[i - 1] ^ a[i];
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}
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t = sqrt(n);
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for (int i = 1, l, r; i <= m; i++) {
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cin >> l >> r;
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q.push_back(std::make_tuple(i, l, r));
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}
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std::sort(q.begin(), q.end(), [&](auto a, auto b) {
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int p = std::get<1>(a) / t,
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q = std::get<1>(b) / t;
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int x = std::get<2>(a),
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y = std::get<2>(b);
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return p == q ? p & 1 ? x < y : x > y : p < q;
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});
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int i = 0, j = 1;
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long long res = 0;
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for (auto &e : q) {
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int id, l, r;
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std::tie(id, l, r) = e;
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while (i < r) add(a[++i], res);
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while (i > r) del(a[i--], res);
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while (j < l - 1) del(a[j++], res);
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while (j > l - 1) add(a[--j], res);
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ans[id] = res;
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}
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for (int i = 1; i <= m; i++) {
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cout << ans[i] << endl;
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}
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return 0;
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}
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