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1584. [Usaco2009 Mar]Cleaning Up 打扫卫生
https://hydro.ac/d/bzoj/record/6322ef85bdf9bc31d160a35f
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BZOJ/1584/1584.cpp
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BZOJ/1584/1584.cpp
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#include <iostream>
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#include <cmath>
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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 = 40005;
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int n, m, t, p[N], pre[N], lst[N], nxt[N], pos[N], cnt[N], f[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 >> m;
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std::fill(f, f + 1 + n, 0x3f3f3f3f);
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for (int i = 1; i <= n; i++) {
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cin >> p[i];
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pre[i] = lst[p[i]];
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nxt[lst[p[i]]] = i;
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lst[p[i]] = i;
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nxt[i] = n + 1;
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}
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t = std::sqrt(n);
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f[1] = 1;
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for (int i = 1; i <= t; i++) {
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pos[i] = 1;
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}
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= t; j++) {
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if (pre[i] < pos[j]) cnt[j]++;
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if (cnt[j] > j) {
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cnt[j]--;
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while (nxt[pos[j]++] < i) {}
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}
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f[i] = std::min(f[i], f[pos[j] - 1] + (int)std::pow(j, 2));
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}
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}
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cout << f[n] << endl;
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return 0;
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}
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