Submission #614126

#	Time	Username	Problem	Language	Result	Execution time	Memory
614126		valerikk	Rope (JOI17_rope)	C++17	100 / 100	1959 ms	86320 KiB

rope

#include <bits/stdc++.h>

using namespace std;

struct tree {
	vector<int> t;
	vector<int> a;
	int n;

	void turnon(int i) {
		t[i + n] = a[i];
		for (i += n; i > 1; i >>= 1) {
			t[i >> 1] = max(t[i], t[i ^ 1]);
		}
	}

	void turnoff(int i) {
		t[i + n] = 0;
		for (i += n; i > 1; i >>= 1) {
			t[i >> 1] = max(t[i], t[i ^ 1]);
		}
	}

	int get_max() {
		return t[1];
	}

	tree(const vector<int> &a_) {
		a = a_;
		n = 1;
		while (n < (int) a.size()) {
			n <<= 1;
		}
		t.resize(2 * n, 0);
		a.resize(n, 0);
		for (int i = 0; i < n; ++i) {
			t[i + n] = a[i];
		}
		for (int i = n - 1; i > 0; --i) {
			t[i] = max(t[i << 1], t[i << 1 | 1]);
		}
	}
};

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, m;
	cin >> n >> m;
	vector<int> c(n);
	for (int i = 0; i < n; ++i) {
		cin >> c[i];
		--c[i];
	}
	vector<int> cnt(m, 0);
	for (int i = 0; i < n; ++i) {
		++cnt[c[i]];
	}
	vector<int> ans(m);
	for (int u = 0; u < m; ++u) {
		ans[u] = n - cnt[u];
	}
	tree t(cnt);
	for (int p = 0; p < 2; ++p) {
		vector<vector<int>> g(m);
		for (int i = p; i + 1 < n; i += 2) {
			if (c[i] != c[i + 1]) {
				g[c[i]].push_back(c[i + 1]);
				g[c[i + 1]].push_back(c[i]);
			}
		}
		for (int u = 0; u < m; ++u) {
			sort(begin(g[u]), end(g[u]));
			vector<int> tmp;
			int len = 0;
			for (int i = 0; i < (int) g[u].size(); ++i) {
				int v = g[u][i];
				++len;
				if (i == (int) g[u].size() - 1 || g[u][i + 1] != v) {
					ans[u] = min(ans[u], n - cnt[u] - cnt[v] + len);
					len = 0;
					tmp.push_back(v);
				}
			}
			g[u] = tmp;
			for (int v : g[u]) {
				t.turnoff(v);
			}
			t.turnoff(u);
			ans[u] = min(ans[u], n - cnt[u] - t.get_max());
			t.turnon(u);
			for (int v : g[u]) {
				t.turnon(v);
			}
		}
	}
	for (int u = 0; u < m; ++u) {
		cout << ans[u] << "\n";
	}
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 20 / 20