Submission #389660

#	Time	Username	Problem	Language	Result	Execution time	Memory
389660		SuhaibSawalha1	Split the Attractions (IOI19_split)	C++17	0 / 100	2089 ms	1048580 KiB

split

#include "split.h"
#include <bits/stdc++.h>
using namespace std;

vector<vector<int>> adj;
vector<bool> vis;
int n, m;
vector<int> ord, k, ans;

void dfs (int u) {
	vis[u] = 1;
	for (int v : adj[u]) {
		if (!vis[v]) {
			dfs(v);
		}
	}
	ord.push_back(u);
}

void go (int i) {
	while (k[i]) {
		--k[i];
		ans[ord.back()] = i + 1;
		ord.pop_back();
	}
}

void split () {
	if ((int)ord.size() == k[0] + k[1] + k[2]) {
		go(0);
		go(1);
		go(2);
	}
	for (int i = 0; i < 3; ++i) {
		for (int j = i + 1; j < 3; ++j) {
			if (k[i] + k[j] == (int)ord.size()) {
				go(i);
				go(j);
			}
		}
	}
	for (int i = 0; i < 3; ++i) {
		if ((int)ord.size() == k[i]) {
			go(i);
		}
	}
}

void color (int u, int c, int p, int f = -1) {
	ans[u] = c;
	for (int v : adj[u]) {
		if (v ^ p && v ^ f) {
			color(v, c, u);
		}
	}
}

int dfs2 (int u, int p = -1) {
	int s = 1;
	vector<array<int, 2>> szz;
	for (int v : adj[u]) {
		if (v ^ p) {
			szz.push_back({dfs2(v, u), v});
			s += szz.back()[0];
		}
	}
	auto i = find(k.begin(), k.end(), s);
	if (i != k.end()) {
		color(u, i - k.begin() + 1, p);
		*i = 0;
		if (~p) {
			adj[p].erase(find(adj[p].begin(), adj[p].end(), u));
		}
		return 0;
	}
	for (auto &v : szz) {
		i = find(k.begin(), k.end(), s - v[0]);
		if (i != k.end()) {
			color(u, i - k.begin() + 1, p, v[1]);
			*i = 0;
			if (~u) {
				adj[p].erase(find(adj[p].begin(), adj[p].end(), u));
				adj[p].push_back(v[1]);
			}
			return 0;
		}
	}
	return s;
}

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
	::n = n;
	k = {a, b, c};
	m = p.size();
	adj.resize(n);
	ans.resize(n);
	for (int i = 0; i < m; ++i) {
		adj[p[i]].push_back(q[i]);
		adj[q[i]].push_back(p[i]);
	}
	vis.resize(n);
	if (m == n - 1) {
		for (int i = 0; i < n; ++i) {
			if (!vis[i]) {
				dfs2(i);
			}
			if (!ans[i]) {
				ord.push_back(i);
			}
		}
		split();
		if (ord.size()) {
			return vector<int>(n, 0);
		}
		return ans;
	}
	vector<int> cmp[m + 1];
	for (int i = 0; i < n; ++i) {
		cmp[adj[i].size()].push_back(i);
	}
	for (int j = 1; j <= m; ++j) {
		for (int i : cmp[j]) {
			if (!vis[i]) {
				dfs(i);
				split();
				if (ord.size()) {
					return vector<int>(n, 0);
				}
			}
		}
	}
	if (count(k.begin(), k.end(), 0) < 2) {
		return vector<int>(n, 0);
	}
	ord = cmp[0];
	split();
	if (ord.size()) {
		return vector<int>(n, 0);
	}
	return ans;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36