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2821. 作诗(Poetize)
https://hydro.ac/d/bzoj/record/62fcd479e42c71bad9ed829f
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BZOJ/2821/2821.cpp
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BZOJ/2821/2821.cpp
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#include <iostream>
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#include <cmath>
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#include <cstring>
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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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constexpr int N = 1e5 + 5,
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M = 1005;
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int n, c, m, a[N], cnt[M][N], ans[M][N], res;
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int t, b, st[N], ed[N], pos[N], h[N];
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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 >> c >> m;
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t = std::sqrt(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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for (b = 1;; b++) {
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st[b] = (b - 1) * t + 1;
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ed[b] = std::min(n, b * t);
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if (b * t >= n) break;
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}
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for (int i = 1; i <= b; i++) {
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for (int j = st[i]; j <= ed[i]; j++) {
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pos[j] = i;
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cnt[i][a[j]]++;
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}
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}
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for (int i = 1; i <= b; i++) {
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for (int j = 0; j <= c; j++) {
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cnt[i][j] += cnt[i - 1][j];
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}
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}
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for (int i = 1; i <= b; i++) {
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for (int j = i; j <= b; j++) {
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ans[i][j] = ans[i][j - 1];
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for (int k = st[j]; k <= ed[j]; k++) {
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h[a[k]]++;
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if (h[a[k]] % 2 == 0) ans[i][j]++;
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else if (h[a[k]] >= 3) ans[i][j]--;
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}
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}
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memset(h, 0x00, sizeof(h));
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}
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while (m--) {
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int l, r;
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cin >> l >> r;
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l = (l + res) % n + 1;
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r = (r + res) % n + 1;
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if (l > r) std::swap(l, r);
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if (pos[l] == pos[r]) {
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res = 0;
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for (int i = l; i <= r; i++) {
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h[a[i]]++;
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if (h[a[i]] % 2 == 0) res++;
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else if (h[a[i]] >= 3) res--;
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}
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for (int i = l; i <= r; i++) h[a[i]]--;
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} else {
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res = ans[pos[l] + 1][pos[r] - 1];
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for (int i = l; i <= ed[pos[l]]; i++) {
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h[a[i]]++;
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int x = cnt[pos[r] - 1][a[i]] - cnt[pos[l]][a[i]];
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if ((h[a[i]] + x) % 2 == 0) res++;
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else if (h[a[i]] + x >= 3) res--;
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}
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for (int i = st[pos[r]]; i <= r; i++) {
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h[a[i]]++;
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int x = cnt[pos[r] - 1][a[i]] - cnt[pos[l]][a[i]];
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if ((h[a[i]] + x) % 2 == 0) res++;
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else if (h[a[i]] + x >= 3) res--;
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}
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for (int i = l; i <= ed[pos[l]]; i++) h[a[i]]--;
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for (int i = st[pos[r]]; i <= r; i++) h[a[i]]--;
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}
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cout << res << endl;
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}
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return 0;
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}
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