oj.uz

답안 #601832

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
601832 2022-07-22T10:38:51 Z DanShaders 늑대인간 (IOI18_werewolf) C++17
15 / 100
 4000 ms 269532 KB 
//Cgrader.cpp
#include "werewolf.h"
#include <bits/stdc++.h>
using namespace std;

#define x first
#define y second
#define all(x) begin(x), end(x)
#define sz(x) ((int) (x).size())
using ll = long long;
using ld = long double;

const int N = 2e5 + 10;

struct Query {
	int s, e, l, r, i;
};

int color[N];
vector<int> g[N];

struct DSU {
	int parent[N];
	vector<int> comp[N];

	DSU() {
		iota(all(parent), 0);
		for (int i = 0; i < N; ++i) {
			comp[i].push_back(i);
		}
	}

	int get(int u) {
		if (u == parent[u]) {
			return u;
		}
		return parent[u] = get(parent[u]);
	}
} dsu;

struct DSU2 {
	int parent[N], rank[N];

	DSU2() {
		iota(all(parent), 0);
	}

	int get(int u) {
		if (u == parent[u]) {
			return u;
		}
		return parent[u] = get(parent[u]);
	}

	bool merge(int a, int b) {
		a = get(a);
		b = get(b);
		if (a == b) {
			return false;
		}
		if (rank[a] == rank[b]) {
			++rank[a];
		}
		if (rank[a] < rank[b]) {
			swap(a, b);
		}
		parent[b] = a;
		return true;
	}
} dsu2;

bool check_reachable(int u, int barrier, int c, int p = -1) {
	if (u < barrier) {
		return false;
	}
	if (color[u] == c) {
		return true;
	}
	for (int v : g[u]) {
		if (v != p && check_reachable(v, barrier, c, u)) {
			return true;
		}
	}
	return false;
}

char used[N];
int sz[N];

int dfs_sz(int u, int p = -1) {
	sz[u] = 1;
	for (int v : g[u]) {
		if (v != p && !used[v]) {
			sz[u] += dfs_sz(v, u);
		}
	}
	return sz[u];
}

int find_centroid(int u, int csz, int p = -1) {
	for (int v : g[u]) {
		if (v != p && !used[v] && 2 * sz[v] > csz) {
			return find_centroid(v, csz, u);
		}
	}
	return u;
}

const int LOG = 20;

int gmn[LOG][N];

struct Node {
	int depth;
	weak_ptr<Node> parent;
	vector<shared_ptr<Node>> children;
	int version;
	map<int, int> where;

	Node(weak_ptr<Node> parent_) : parent(parent_) {}
};

int current_version = 15;

shared_ptr<Node> node_at[N];

shared_ptr<Node> centroid_dfs(int u, weak_ptr<Node> parent = {}, int depth = 0) {
	u = find_centroid(u, dfs_sz(u));

	auto node = make_shared<Node>(parent);
	node_at[u] = node;
	node->depth = depth;
	node->parent = parent;

	queue<tuple<int, int, int>> bfs;
	bfs.push({u, u, -1});
	while (sz(bfs)) {
		auto [v, mn, p] = bfs.front();
		gmn[depth][v] = node->where[v] = mn;
		bfs.pop();
		for (int w : g[v]) {
			if (p != w && !used[w]) {
				bfs.push({w, min(mn, w), v});
			}
		}
	}

	used[u] = 1;
	for (int v : g[u]) {
		if (!used[v]) {
			node->children.push_back(centroid_dfs(v, node, depth + 1));
		}
	}
	return node;
}

vector<int> check_validity(int, vector<int> us, vector<int> vs, vector<int> qs, vector<int> qe, vector<int> ql, vector<int> qr) {
	vector<Query> queries;
	for (int i = 0; i < sz(qs); ++i) {
		queries.push_back({qe[i], qs[i], qr[i], ql[i], i});
	}
	vector<pair<int, int>> e1, e2;
	for (int i = 0; i < sz(us); ++i) {
		e1.emplace_back(us[i], vs[i]);
	}
	e2 = e1;
	iota(all(color), 0);
	sort(all(e1), [](const auto &x, const auto &y) {
		return max(x.x, x.y) < max(y.x, y.y);
	});
	sort(all(e2), [](const auto &x, const auto &y) {
		return min(x.x, x.y) > min(y.x, y.y);
	});
	for (auto [u, v] : e2) {
		if (dsu2.merge(u, v)) {
			g[u].push_back(v);
			g[v].push_back(u);
		}
	}
	sort(all(queries), [](const auto &x, const auto &y) {
		return x.l < y.l;
	});
	vector<int> ans(sz(queries));

	centroid_dfs(0);

	int e1i = 0;
	for (auto [s, e, l, r, i] : queries) {
		while (e1i < sz(e1) && max(e1[e1i].x, e1[e1i].y) <= l) {
			int a = dsu.get(e1[e1i].x), b = dsu.get(e1[e1i].y);
			++e1i;
			if (a == b) {
				continue;
			}
			if (sz(dsu.comp[a]) < sz(dsu.comp[b])) {
				swap(a, b);
			}

			++current_version;
			for (int u : dsu.comp[b]) {
				auto curr = node_at[u];
				while (curr && curr->version != current_version) {
					curr->version = current_version;

					auto it = curr->where.find(a);
					if (it == curr->where.end()) {
						curr->where[a] = curr->where[b];
					} else {
						it->second = max(it->second, curr->where[b]);
					}
					curr = curr->parent.lock();
				}
				color[u] = a;
			}
			dsu.comp[a].insert(end(dsu.comp[a]), all(dsu.comp[b]));
			vector<int>().swap(dsu.comp[b]);

			dsu.parent[b] = a;
		}
		auto curr = node_at[e];
		while (curr) {
			if (gmn[curr->depth][e] >= r) {
				auto it = curr->where.find(color[s]);
				if (it != curr->where.end() && it->second >= r) {
					ans[i] = 1;
					break;
				}
			}
			curr = curr->parent.lock();
		}
		// ans[i] = check_reachable(e, r, color[s]);
	}
	return ans;
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 18388 KB Output is correct
2 Correct 15 ms 18388 KB Output is correct
3 Correct 15 ms 18312 KB Output is correct
4 Correct 15 ms 18260 KB Output is correct
5 Correct 16 ms 18508 KB Output is correct
6 Correct 17 ms 18392 KB Output is correct
7 Correct 19 ms 18408 KB Output is correct
8 Correct 16 ms 18364 KB Output is correct
9 Correct 16 ms 18440 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 18388 KB Output is correct
2 Correct 15 ms 18388 KB Output is correct
3 Correct 15 ms 18312 KB Output is correct
4 Correct 15 ms 18260 KB Output is correct
5 Correct 16 ms 18508 KB Output is correct
6 Correct 17 ms 18392 KB Output is correct
7 Correct 19 ms 18408 KB Output is correct
8 Correct 16 ms 18364 KB Output is correct
9 Correct 16 ms 18440 KB Output is correct
10 Correct 28 ms 20884 KB Output is correct
11 Correct 26 ms 20672 KB Output is correct
12 Correct 36 ms 21616 KB Output is correct
13 Correct 26 ms 20656 KB Output is correct
14 Correct 25 ms 20420 KB Output is correct
15 Correct 34 ms 21080 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4059 ms 269532 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 18388 KB Output is correct
2 Correct 15 ms 18388 KB Output is correct
3 Correct 15 ms 18312 KB Output is correct
4 Correct 15 ms 18260 KB Output is correct
5 Correct 16 ms 18508 KB Output is correct
6 Correct 17 ms 18392 KB Output is correct
7 Correct 19 ms 18408 KB Output is correct
8 Correct 16 ms 18364 KB Output is correct
9 Correct 16 ms 18440 KB Output is correct
10 Correct 28 ms 20884 KB Output is correct
11 Correct 26 ms 20672 KB Output is correct
12 Correct 36 ms 21616 KB Output is correct
13 Correct 26 ms 20656 KB Output is correct
14 Correct 25 ms 20420 KB Output is correct
15 Correct 34 ms 21080 KB Output is correct
16 Execution timed out 4059 ms 269532 KB Time limit exceeded
17 Halted 0 ms 0 KB -