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답안 #600238

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
600238 2022-07-20T14:50:46 Z acatmeowmeow 경주 (Race) (IOI11_race) C++11
100 / 100
 1533 ms 60748 KB 
#include "race.h"
//#include "grader.h"

#include <bits/stdc++.h>

using namespace std;

#define int long long 

const int NMAX = 2e5 + 5;

vector<pair<int, int>> adj[NMAX];

int sz[NMAX];
bool removed[NMAX];

int get_size(int u, int e) {
	sz[u] = 1;
	for (auto&x : adj[u]) {
		int v = x.first;
		if (v == e || removed[v]) continue;
		sz[u] += get_size(v, u);
	}
	return sz[u];
}

int get_centroid(int u, int e, int s) {
	for (auto&x : adj[u]) {
		int v = x.first;
		if (v == e || removed[v] || sz[v] <= s/2) continue;
		return get_centroid(v, u, s);
	}
	return u;
}

int dist[NMAX], depth[NMAX], ans = 1e18;

void dfs(int u, int e, int root, map<int, int>&res) {
	if (!res.count(dist[u])) res[dist[u]] = depth[u];
	res[dist[u]] = min(res[dist[u]], depth[u]);
	for (auto&x : adj[u]) {
		int v = x.first, c = x.second;
		if (v == e || removed[v]) continue;
		dist[v] = dist[u] + c, depth[v] = depth[u] + 1;
		dfs(v, u, root, res);
	}
}

void build(int u, int e, int K, int N) {
	int s = get_size(u, e), centroid = get_centroid(u, e, s);
	//
	map<int, int> tot;
	tot[0] = dist[centroid] = depth[centroid] = 0;
	for (auto&x : adj[centroid]) {
		int v = x.first, c = x.second;
		if (v == e || removed[v]) continue;
		dist[v] = dist[centroid] + c, depth[v] = depth[centroid] + 1;
		map<int, int> res;
		dfs(v, centroid, v, res);
		if (tot.size() < res.size()) swap(tot, res);
		for (auto&x : res) {
			int cost = x.first, edge = x.second;
			if (tot.count(K - cost)) ans = min(ans, edge + tot[K - cost]);
		}
		for (auto&x : res) {
			int cost = x.first, edge = x.second;
			if (tot.count(cost)) tot[cost] = min(tot[cost], edge);
			else tot[cost] = edge;
		}
	}
	// 	
	removed[centroid] = true;
	for (auto&x : adj[centroid]) {
		int v = x.first;
		if (v == e || removed[v]) continue;
		build(v, centroid, K, N);
	}
}

signed best_path(signed N, signed K, signed H[][2], signed L[]) {
	for (int i = 0; i < N - 1; i++) {
		int u = H[i][0], v = H[i][1], c = L[i];
		//adj[u].push_back({v, c}), adj[v].push_back({u, c});
		adj[u].push_back(make_pair(v, c)), adj[v].push_back(make_pair(u, c));
	}
	build(0, -1, K, N);
	return ans == 1e18 ? -1 : ans;
}

/*signed N, K, H[NMAX][2], L[NMAX];

signed main() {
	cin >> N >> K;
	for (int i = 0; i < N - 1; i++) cin >> H[i][0] >> H[i][1] >> L[i];
	cout << best_path(N, K, H, L) << '\n'; 
	return 0;
}*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4960 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 4948 KB Output is correct
7 Correct 3 ms 4996 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 5 ms 5064 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4960 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 4948 KB Output is correct
7 Correct 3 ms 4996 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 5 ms 5064 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 4 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 5 ms 5168 KB Output is correct
22 Correct 5 ms 5204 KB Output is correct
23 Correct 6 ms 5204 KB Output is correct
24 Correct 5 ms 5236 KB Output is correct
25 Correct 5 ms 5232 KB Output is correct
26 Correct 5 ms 5204 KB Output is correct
27 Correct 4 ms 5076 KB Output is correct
28 Correct 5 ms 5204 KB Output is correct
29 Correct 5 ms 5144 KB Output is correct
30 Correct 5 ms 5204 KB Output is correct
31 Correct 6 ms 5204 KB Output is correct
32 Correct 6 ms 5204 KB Output is correct
33 Correct 8 ms 5204 KB Output is correct
34 Correct 5 ms 5204 KB Output is correct
35 Correct 5 ms 5204 KB Output is correct
36 Correct 5 ms 5204 KB Output is correct
37 Correct 6 ms 5204 KB Output is correct
38 Correct 6 ms 5148 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4960 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 4948 KB Output is correct
7 Correct 3 ms 4996 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 5 ms 5064 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 370 ms 13848 KB Output is correct
20 Correct 406 ms 13828 KB Output is correct
21 Correct 338 ms 13832 KB Output is correct
22 Correct 310 ms 13852 KB Output is correct
23 Correct 464 ms 14524 KB Output is correct
24 Correct 226 ms 13392 KB Output is correct
25 Correct 246 ms 19516 KB Output is correct
26 Correct 104 ms 19520 KB Output is correct
27 Correct 402 ms 23168 KB Output is correct
28 Correct 1533 ms 58924 KB Output is correct
29 Correct 1486 ms 58048 KB Output is correct
30 Correct 383 ms 23356 KB Output is correct
31 Correct 367 ms 23288 KB Output is correct
32 Correct 468 ms 23244 KB Output is correct
33 Correct 716 ms 22440 KB Output is correct
34 Correct 1431 ms 43656 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4960 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 4948 KB Output is correct
7 Correct 3 ms 4996 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 5 ms 5064 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 4 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 4 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 5 ms 5168 KB Output is correct
22 Correct 5 ms 5204 KB Output is correct
23 Correct 6 ms 5204 KB Output is correct
24 Correct 5 ms 5236 KB Output is correct
25 Correct 5 ms 5232 KB Output is correct
26 Correct 5 ms 5204 KB Output is correct
27 Correct 4 ms 5076 KB Output is correct
28 Correct 5 ms 5204 KB Output is correct
29 Correct 5 ms 5144 KB Output is correct
30 Correct 5 ms 5204 KB Output is correct
31 Correct 6 ms 5204 KB Output is correct
32 Correct 6 ms 5204 KB Output is correct
33 Correct 8 ms 5204 KB Output is correct
34 Correct 5 ms 5204 KB Output is correct
35 Correct 5 ms 5204 KB Output is correct
36 Correct 5 ms 5204 KB Output is correct
37 Correct 6 ms 5204 KB Output is correct
38 Correct 6 ms 5148 KB Output is correct
39 Correct 370 ms 13848 KB Output is correct
40 Correct 406 ms 13828 KB Output is correct
41 Correct 338 ms 13832 KB Output is correct
42 Correct 310 ms 13852 KB Output is correct
43 Correct 464 ms 14524 KB Output is correct
44 Correct 226 ms 13392 KB Output is correct
45 Correct 246 ms 19516 KB Output is correct
46 Correct 104 ms 19520 KB Output is correct
47 Correct 402 ms 23168 KB Output is correct
48 Correct 1533 ms 58924 KB Output is correct
49 Correct 1486 ms 58048 KB Output is correct
50 Correct 383 ms 23356 KB Output is correct
51 Correct 367 ms 23288 KB Output is correct
52 Correct 468 ms 23244 KB Output is correct
53 Correct 716 ms 22440 KB Output is correct
54 Correct 1431 ms 43656 KB Output is correct
55 Correct 33 ms 6612 KB Output is correct
56 Correct 17 ms 5844 KB Output is correct
57 Correct 153 ms 14220 KB Output is correct
58 Correct 54 ms 14400 KB Output is correct
59 Correct 484 ms 30432 KB Output is correct
60 Correct 1432 ms 59420 KB Output is correct
61 Correct 433 ms 28072 KB Output is correct
62 Correct 367 ms 26204 KB Output is correct
63 Correct 450 ms 26256 KB Output is correct
64 Correct 1491 ms 40740 KB Output is correct
65 Correct 1194 ms 48200 KB Output is correct
66 Correct 1416 ms 60748 KB Output is correct
67 Correct 176 ms 25136 KB Output is correct
68 Correct 624 ms 41860 KB Output is correct
69 Correct 613 ms 42224 KB Output is correct
70 Correct 590 ms 40152 KB Output is correct