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#1709. 【2022.10.31 联考】出题(questions)
https://sjzezoj.com/submission/62647
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S2OJ/1709/1709.cpp
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S2OJ/1709/1709.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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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 = 2e5 + 5;
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int n, q, t, a[N], cnt[N], cnt2[N], ans[N];
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std::tuple<int, int, int, int> queries[N];
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void add(int x) {
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cnt2[++cnt[x]]++;
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}
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void del(int x) {
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cnt2[cnt[x]--]--;
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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;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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cin >> q;
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for (int i = 1; i <= q; i++) {
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cin >> std::get<1>(queries[i]) >> std::get<2>(queries[i]) >> std::get<3>(queries[i]);
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std::get<0>(queries[i]) = i;
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}
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t = std::sqrt(q);
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std::sort(queries + 1, queries + 1 + q, [&](auto a, auto b) -> bool {
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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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return p == q
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? (p & 1)
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? std::get<2>(a) < std::get<2>(b)
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: std::get<2>(a) > std::get<2>(b)
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: p < q;
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});
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cnt2[0] = n;
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for (int _ = 1, i = 0, j = 1; _ <= q; _++) {
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int id, l, r, k;
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std::tie(id, l, r, k) = queries[_];
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while (i < r) add(a[++i]);
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while (i > r) del(a[i--]);
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while (j > l) add(a[--j]);
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while (j < l) del(a[j++]);
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ans[id] = cnt2[k];
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}
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for (int i = 1; i <= q; 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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