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3236. [Ahoi2013] 作业
https://hydro.ac/d/bzoj/record/6322f16dbdf9bc31d160a4f9
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BZOJ/3236/3236.cpp
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BZOJ/3236/3236.cpp
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#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 = 1e6 + 5;
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int n, m, w[N], c[N], c1[N], c2[N], t;
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std::pair<int, int> now, ans[N];
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std::vector<std::tuple<int, int, int, int, int>> q;
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inline int lowbit(int x) {
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return x & -x;
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}
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void add(int *c, int x, int y) {
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for (; x <= n; x += lowbit(x)) c[x] += y;
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}
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int sum(int *c, int x) {
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int res = 0;
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for (; x; x -= lowbit(x)) res += c[x];
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return res;
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}
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void add(int x) {
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if (!c[x]++) add(c1, x, 1);
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add(c2, x, 1);
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}
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void del(int x) {
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if (!--c[x]) add(c1, x, -1);
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add(c2, x, -1);
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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;
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for (int i = 1; i <= n; i++) {
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cin >> w[i];
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}
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t = sqrt(n);
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for (int i = 1, l, r, a, b; i <= m; i++) {
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cin >> l >> r >> a >> b;
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q.push_back(std::make_tuple(i, l, r, a, b));
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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
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? p & 1 ? x < y : x > y
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: p < q;
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});
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int i = 0, j = 1;
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for (auto &e : q) {
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int id, l, r, a, b;
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std::tie(id, l, r, a, b) = e;
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while (i < r) add(w[++i]);
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while (i > r) del(w[i--]);
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while (j < l) del(w[j++]);
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while (j > l) add(w[--j]);
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ans[id] = std::make_pair(sum(c2, b) - sum(c2, a - 1), sum(c1, b) - sum(c1, a - 1));
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}
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for (int i = 1; i <= m; i++) {
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cout << ans[i].first << ' ' << ans[i].second << endl;
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}
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return 0;
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}
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