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답안 #759234

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
759234 2023-06-15T22:28:23 Z raysh07 경주 (Race) (IOI11_race) C++17
100 / 100
 695 ms 42572 KB 
#include "race.h"
#include <bits/stdc++.h>
using namespace std;

const int maxn = 2e5 + 69;
int n, k;
vector <pair<int, int>> adj[maxn];
bool del[maxn];
int sz[maxn];
map <int, int> mp;
vector <int> comp;
int ans = 1e9;
vector <pair<int, int>> vec;

void dfs(int u, int par, int dist, int dep = 1){
	if (dist > k) return;
	vec.push_back(make_pair(dist, dep));
	if (mp.find(k - dist) != mp.end()){
		ans = min(ans, mp[k - dist] + dep);
	}

	for (auto [v, w] : adj[u]){
		if (!del[v] && v != par){
			dfs(v, u, dist + w, dep + 1);
		}
	}
}

void dfs2(int u, int par){
	sz[u] = 1;
	comp.push_back(u);
	for (auto [v, w] : adj[u]){
		if (!del[v] && v != par){
			dfs2(v, u);
			sz[u] += sz[v];
		}
	}
}

int find(int x){
	comp.clear();
	dfs2(x, -1);

	for (auto u : comp){
		int mx = 0;
		for (auto [v, w] : adj[u]){
		    if (!del[v] && sz[v] < sz[u])
			mx = max(mx, sz[v]);
		}
		mx = max(mx, (int)comp.size() - 1 - sz[u]);
		
// 		cout << u << " " << mx << "\n";
		if (2 * mx <= (int)comp.size()) return u;
	}
	
// 	for (auto x : comp){
// 	    cout << x << " " << sz[x] << "\n";
// 	}
// 	exit(0);

	assert(false);
}

void cd(int x){
	x = find(x);
	mp.clear();

	mp[0] = 0;
	int u = x;
	for (auto [v, w] : adj[u]){
		if (!del[v]){
			dfs(v, u, w);
			for (auto [x, y] : vec){
				if (mp.find(x) == mp.end()) mp[x] = y;
				else mp[x] = min(mp[x], y);
			}
			vec.clear();
		}
	}

	del[x] = true;
	for (auto [v, w] : adj[x]){
		if (!del[v]){
			cd(v);
		}
	}
}

int best_path(int N, int K, int H[][2], int L[])
{
	n = N; k = K;
	for (int i = 0; i < n - 1; i++){
		int u = H[i][0];
		int v = H[i][1];
		int w = L[i];

		adj[u].push_back(make_pair(v, w));
		adj[v].push_back(make_pair(u, w));
	}

	cd(0);

	if (ans == 1e9) return -1;
	else return ans;
}

// int main(){
// 	int n, k; cin >> n >> k;

// 	int H[n - 1][2], L[n - 1];
// 	for (int i = 0; i < n - 1; i++){
// 		cin >> H[i][0] >> H[i][1];
// 	}
// 	for (int i = 0; i < n - 1; i++) cin >> L[i];

// 	cout << best_path(n, k, H, L);
// 	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 3 ms 5016 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5012 KB Output is correct
18 Correct 3 ms 5076 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 3 ms 5016 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5012 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 2 ms 5020 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 5076 KB Output is correct
22 Correct 3 ms 5072 KB Output is correct
23 Correct 3 ms 5076 KB Output is correct
24 Correct 3 ms 5076 KB Output is correct
25 Correct 3 ms 5028 KB Output is correct
26 Correct 3 ms 5076 KB Output is correct
27 Correct 4 ms 5024 KB Output is correct
28 Correct 4 ms 5032 KB Output is correct
29 Correct 4 ms 5076 KB Output is correct
30 Correct 4 ms 5024 KB Output is correct
31 Correct 4 ms 5152 KB Output is correct
32 Correct 3 ms 5076 KB Output is correct
33 Correct 4 ms 5076 KB Output is correct
34 Correct 3 ms 5076 KB Output is correct
35 Correct 3 ms 5076 KB Output is correct
36 Correct 3 ms 5076 KB Output is correct
37 Correct 5 ms 5076 KB Output is correct
38 Correct 4 ms 5076 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 3 ms 5016 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5012 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 169 ms 12172 KB Output is correct
20 Correct 130 ms 12292 KB Output is correct
21 Correct 141 ms 12536 KB Output is correct
22 Correct 173 ms 12612 KB Output is correct
23 Correct 61 ms 12492 KB Output is correct
24 Correct 62 ms 12448 KB Output is correct
25 Correct 102 ms 15712 KB Output is correct
26 Correct 90 ms 19952 KB Output is correct
27 Correct 145 ms 19732 KB Output is correct
28 Correct 215 ms 34112 KB Output is correct
29 Correct 210 ms 33008 KB Output is correct
30 Correct 145 ms 19700 KB Output is correct
31 Correct 170 ms 19660 KB Output is correct
32 Correct 161 ms 19792 KB Output is correct
33 Correct 218 ms 18596 KB Output is correct
34 Correct 139 ms 19484 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 3 ms 5016 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 4 ms 5016 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Correct 3 ms 5012 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 2 ms 5020 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 5076 KB Output is correct
22 Correct 3 ms 5072 KB Output is correct
23 Correct 3 ms 5076 KB Output is correct
24 Correct 3 ms 5076 KB Output is correct
25 Correct 3 ms 5028 KB Output is correct
26 Correct 3 ms 5076 KB Output is correct
27 Correct 4 ms 5024 KB Output is correct
28 Correct 4 ms 5032 KB Output is correct
29 Correct 4 ms 5076 KB Output is correct
30 Correct 4 ms 5024 KB Output is correct
31 Correct 4 ms 5152 KB Output is correct
32 Correct 3 ms 5076 KB Output is correct
33 Correct 4 ms 5076 KB Output is correct
34 Correct 3 ms 5076 KB Output is correct
35 Correct 3 ms 5076 KB Output is correct
36 Correct 3 ms 5076 KB Output is correct
37 Correct 5 ms 5076 KB Output is correct
38 Correct 4 ms 5076 KB Output is correct
39 Correct 169 ms 12172 KB Output is correct
40 Correct 130 ms 12292 KB Output is correct
41 Correct 141 ms 12536 KB Output is correct
42 Correct 173 ms 12612 KB Output is correct
43 Correct 61 ms 12492 KB Output is correct
44 Correct 62 ms 12448 KB Output is correct
45 Correct 102 ms 15712 KB Output is correct
46 Correct 90 ms 19952 KB Output is correct
47 Correct 145 ms 19732 KB Output is correct
48 Correct 215 ms 34112 KB Output is correct
49 Correct 210 ms 33008 KB Output is correct
50 Correct 145 ms 19700 KB Output is correct
51 Correct 170 ms 19660 KB Output is correct
52 Correct 161 ms 19792 KB Output is correct
53 Correct 218 ms 18596 KB Output is correct
54 Correct 139 ms 19484 KB Output is correct
55 Correct 15 ms 5844 KB Output is correct
56 Correct 12 ms 5856 KB Output is correct
57 Correct 111 ms 12884 KB Output is correct
58 Correct 40 ms 12460 KB Output is correct
59 Correct 224 ms 23248 KB Output is correct
60 Correct 695 ms 42572 KB Output is correct
61 Correct 193 ms 19968 KB Output is correct
62 Correct 210 ms 19808 KB Output is correct
63 Correct 297 ms 19784 KB Output is correct
64 Correct 673 ms 25204 KB Output is correct
65 Correct 138 ms 20568 KB Output is correct
66 Correct 465 ms 30696 KB Output is correct
67 Correct 94 ms 21300 KB Output is correct
68 Correct 292 ms 23928 KB Output is correct
69 Correct 301 ms 24004 KB Output is correct
70 Correct 256 ms 23128 KB Output is correct