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답안 #1082353

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1082353 2024-08-31T08:06:55 Z vuavisao Roadside Advertisements (NOI17_roadsideadverts) C++14
100 / 100
 41 ms 9752 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

using ll = long long;

const int N = 50'000 + 10;


int n, q;
vector<pair<int, int>> g[N];

int Lg, dist[N], parent[20][N];
int cnt, in[N];
int sDist[N];

void dfs(int u, int p) {
	in[u] = ++ cnt;
	for (const auto& x : g[u]) {
		int v = x.first, w = x.second;
		if (v == p) continue;
		parent[0][v] = u;
		dist[v] = dist[u] + 1;
		sDist[v] = sDist[u] + w;
		dfs(v, u);
	}
};

int lca(int u, int v) {
	if (dist[u] < dist[v]) swap(u, v);

	int delta = dist[u] - dist[v];
	for (int lg = Lg; lg >= 0; -- lg) {
		if (((delta >> lg) & 1)) {
			u = parent[lg][u];
		}
	}
	if (u == v) return u;
	
	for (int lg = Lg; lg >= 0; -- lg) {
		if (parent[lg][u] != parent[lg][v]) {
			u = parent[lg][u];
			v = parent[lg][v];
		}
	}
	return parent[0][u];
}

int getSdist(int u, int p) {
	return sDist[u] - sDist[p];
}

int32_t main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(nullptr); std::cout.tie(nullptr);
	cin >> n;
	for (int i = 2; i <= n; ++ i) {
		int u, v, w; cin >> u >> v >> w;
		++ u, ++ v;
		g[u].push_back(make_pair(v, w));
		g[v].push_back(make_pair(u, w));
	}
	
	Lg = __lg(n);
	dist[1] = 1; dfs(1, 0);
	for (int lg = 1; lg <= Lg; ++ lg) {
		for (int u = 1; u <= n; ++ u) {
			parent[lg][u] = parent[lg - 1][parent[lg - 1][u]];
		}
	}

	cin >> q;
	while (q -- > 0) {
		int ver[5];
		for (int i = 0; i < 5; ++ i) cin >> ver[i], ++ ver[i];
		sort(ver, ver + 5, [&] (int u, int v) -> bool {
			return in[u] < in[v];
		});
		int anc = lca(ver[0], ver[1]);
		for (int i = 2; i < 5; ++ i) {
			anc = lca(anc, ver[i]);
		}
		int res = getSdist(ver[0], anc);
		for (int i = 1; i < 5; ++ i) {
			res += getSdist(ver[i], lca(ver[i], ver[i - 1]));
		}
		cout << res << '\n';
	}
	return (0 ^ 0);
}

/// Code by vuavisao

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1624 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 7852 KB Output is correct
2 Correct 29 ms 9552 KB Output is correct
3 Correct 31 ms 9752 KB Output is correct
4 Correct 30 ms 9724 KB Output is correct
5 Correct 31 ms 9560 KB Output is correct
6 Correct 30 ms 9612 KB Output is correct
7 Correct 31 ms 9552 KB Output is correct
8 Correct 36 ms 9560 KB Output is correct
9 Correct 30 ms 9564 KB Output is correct
10 Correct 30 ms 9556 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 7000 KB Output is correct
2 Correct 20 ms 9044 KB Output is correct
3 Correct 19 ms 9044 KB Output is correct
4 Correct 19 ms 9048 KB Output is correct
5 Correct 19 ms 9084 KB Output is correct
6 Correct 17 ms 9048 KB Output is correct
7 Correct 20 ms 9048 KB Output is correct
8 Correct 17 ms 9180 KB Output is correct
9 Correct 17 ms 9052 KB Output is correct
10 Correct 17 ms 9052 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1624 KB Output is correct
2 Correct 31 ms 7852 KB Output is correct
3 Correct 29 ms 9552 KB Output is correct
4 Correct 31 ms 9752 KB Output is correct
5 Correct 30 ms 9724 KB Output is correct
6 Correct 31 ms 9560 KB Output is correct
7 Correct 30 ms 9612 KB Output is correct
8 Correct 31 ms 9552 KB Output is correct
9 Correct 36 ms 9560 KB Output is correct
10 Correct 30 ms 9564 KB Output is correct
11 Correct 30 ms 9556 KB Output is correct
12 Correct 16 ms 7000 KB Output is correct
13 Correct 20 ms 9044 KB Output is correct
14 Correct 19 ms 9044 KB Output is correct
15 Correct 19 ms 9048 KB Output is correct
16 Correct 19 ms 9084 KB Output is correct
17 Correct 17 ms 9048 KB Output is correct
18 Correct 20 ms 9048 KB Output is correct
19 Correct 17 ms 9180 KB Output is correct
20 Correct 17 ms 9052 KB Output is correct
21 Correct 17 ms 9052 KB Output is correct
22 Correct 30 ms 8792 KB Output is correct
23 Correct 27 ms 8284 KB Output is correct
24 Correct 31 ms 9552 KB Output is correct
25 Correct 41 ms 9512 KB Output is correct
26 Correct 32 ms 9552 KB Output is correct
27 Correct 30 ms 9472 KB Output is correct
28 Correct 29 ms 9560 KB Output is correct
29 Correct 29 ms 9564 KB Output is correct
30 Correct 33 ms 9556 KB Output is correct
31 Correct 31 ms 9500 KB Output is correct