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답안 #236745

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
236745 2020-06-03T07:46:35 Z srvlt 경주 (Race) (IOI11_race) C++14
100 / 100
 721 ms 35576 KB 
#include "race.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
 
#define ll long long
#define ull unsigned long long
#define db long double
#define pb push_back
#define ppb pop_back
#define F first
#define S second
#define mp make_pair
#define all(x) (x).begin(), (x).end()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef vector <int> vi;
typedef vector <ll> vll;

typedef tree <pii, null_type, less <pii>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int max_N = 200003, max_K = 1000003, INF = 1e9;
int n, k, sz[max_N], mx[max_N], del[max_N], val[max_K], ans = max_N;
vector <pii> adj[max_N];

void dfs(int v, int p) {
	sz[v] = 1;
	mx[v] = -1;
	for (auto i : adj[v]) {
		int to = i.F;
		if (to == p || del[to]) {
			continue;
		}
		dfs(to, v);
		sz[v] += sz[to];
		if (mx[v] == -1 || sz[mx[v]] < sz[to]) {
			mx[v] = to;
		}
	}
}

int centroid(int v) {
	int u = v;
	while (mx[v] != -1 && sz[mx[v]] > sz[u] / 2) {
		v = mx[v];
	}
	return v;
}

void add(int v, int p, int d, int l) {
	if (d > k) {
		return;
	}
	val[d] = min(val[d], l);
	for (auto i : adj[v]) {
		int to = i.F, w = i.S;
		if (to == p || del[to]) {
			continue;
		}
		add(to, v, d + w, l + 1);
	}
}

void calc(int v, int p, int d, int l) {
	if (d > k) {
		return;
	}
	ans = min(ans, val[k - d] + l);
	for (auto i : adj[v]) {
		int to = i.F, w = i.S;
		if (to == p || del[to]) {
			continue;
		}
		calc(to, v, d + w, l + 1);
	}
}

void clear(int v, int p, int d, int l) {
	if (d > k) {
		return;
	}
	val[d] = INF;
	for (auto i : adj[v]) {
		int to = i.F, w = i.S;
		if (to == p || del[to]) {
			continue;
		}
		clear(to, v, d + w, l + 1);
	}
}

void solve(int v) {
	val[0] = 0;
	for (auto i : adj[v]) {
		int to = i.F, w = i.S;
		if (del[to]) {
			continue;
		}
		calc(to, v, w, 1);
		add(to, v, w, 1);
	}
	for (auto i : adj[v]) {
		int to = i.F, w = i.S;
		if (del[to]) {
			continue;
		}
		clear(to, v, w, 1);
	}
}

void build(int v, int d) {
	dfs(v, -1);
	int c = centroid(v);
	solve(c);
	del[c] = 1;
	for (auto i : adj[c]) {
		int to = i.F;
		if (!del[to]) {
			build(to, d + 1);
		}
	}
}

int best_path(int N, int K, int H[][2], int L[]) {
	n = N;
	k = K;
	for (int i = 0; i < n - 1; i++) {
		adj[H[i][0]].pb({H[i][1], L[i]});
		adj[H[i][1]].pb({H[i][0], L[i]});
	}
	memset(& val, 0x3f, sizeof(val));
	build(0, 0);
	if (ans == max_N) {
		return -1;
	}
	return ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 8960 KB Output is correct
2 Correct 9 ms 8960 KB Output is correct
3 Correct 9 ms 8960 KB Output is correct
4 Correct 10 ms 8960 KB Output is correct
5 Correct 9 ms 8960 KB Output is correct
6 Correct 9 ms 8960 KB Output is correct
7 Correct 10 ms 8960 KB Output is correct
8 Correct 9 ms 8960 KB Output is correct
9 Correct 10 ms 8960 KB Output is correct
10 Correct 9 ms 8960 KB Output is correct
11 Correct 10 ms 8960 KB Output is correct
12 Correct 10 ms 8960 KB Output is correct
13 Correct 9 ms 8960 KB Output is correct
14 Correct 10 ms 8960 KB Output is correct
15 Correct 9 ms 8960 KB Output is correct
16 Correct 9 ms 8960 KB Output is correct
17 Correct 10 ms 9012 KB Output is correct
18 Correct 9 ms 8960 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 8960 KB Output is correct
2 Correct 9 ms 8960 KB Output is correct
3 Correct 9 ms 8960 KB Output is correct
4 Correct 10 ms 8960 KB Output is correct
5 Correct 9 ms 8960 KB Output is correct
6 Correct 9 ms 8960 KB Output is correct
7 Correct 10 ms 8960 KB Output is correct
8 Correct 9 ms 8960 KB Output is correct
9 Correct 10 ms 8960 KB Output is correct
10 Correct 9 ms 8960 KB Output is correct
11 Correct 10 ms 8960 KB Output is correct
12 Correct 10 ms 8960 KB Output is correct
13 Correct 9 ms 8960 KB Output is correct
14 Correct 10 ms 8960 KB Output is correct
15 Correct 9 ms 8960 KB Output is correct
16 Correct 9 ms 8960 KB Output is correct
17 Correct 10 ms 9012 KB Output is correct
18 Correct 9 ms 8960 KB Output is correct
19 Correct 9 ms 8960 KB Output is correct
20 Correct 10 ms 8992 KB Output is correct
21 Correct 11 ms 8960 KB Output is correct
22 Correct 10 ms 9088 KB Output is correct
23 Correct 10 ms 8960 KB Output is correct
24 Correct 10 ms 8960 KB Output is correct
25 Correct 10 ms 9088 KB Output is correct
26 Correct 10 ms 8960 KB Output is correct
27 Correct 10 ms 8960 KB Output is correct
28 Correct 10 ms 9088 KB Output is correct
29 Correct 10 ms 9120 KB Output is correct
30 Correct 10 ms 8960 KB Output is correct
31 Correct 10 ms 8960 KB Output is correct
32 Correct 10 ms 9120 KB Output is correct
33 Correct 11 ms 9048 KB Output is correct
34 Correct 10 ms 9088 KB Output is correct
35 Correct 10 ms 9088 KB Output is correct
36 Correct 10 ms 8960 KB Output is correct
37 Correct 11 ms 9088 KB Output is correct
38 Correct 10 ms 8960 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 8960 KB Output is correct
2 Correct 9 ms 8960 KB Output is correct
3 Correct 9 ms 8960 KB Output is correct
4 Correct 10 ms 8960 KB Output is correct
5 Correct 9 ms 8960 KB Output is correct
6 Correct 9 ms 8960 KB Output is correct
7 Correct 10 ms 8960 KB Output is correct
8 Correct 9 ms 8960 KB Output is correct
9 Correct 10 ms 8960 KB Output is correct
10 Correct 9 ms 8960 KB Output is correct
11 Correct 10 ms 8960 KB Output is correct
12 Correct 10 ms 8960 KB Output is correct
13 Correct 9 ms 8960 KB Output is correct
14 Correct 10 ms 8960 KB Output is correct
15 Correct 9 ms 8960 KB Output is correct
16 Correct 9 ms 8960 KB Output is correct
17 Correct 10 ms 9012 KB Output is correct
18 Correct 9 ms 8960 KB Output is correct
19 Correct 180 ms 14968 KB Output is correct
20 Correct 171 ms 14968 KB Output is correct
21 Correct 210 ms 14968 KB Output is correct
22 Correct 207 ms 15132 KB Output is correct
23 Correct 107 ms 15224 KB Output is correct
24 Correct 78 ms 15108 KB Output is correct
25 Correct 151 ms 18552 KB Output is correct
26 Correct 110 ms 22264 KB Output is correct
27 Correct 191 ms 21240 KB Output is correct
28 Correct 331 ms 35576 KB Output is correct
29 Correct 318 ms 34296 KB Output is correct
30 Correct 204 ms 21112 KB Output is correct
31 Correct 191 ms 21216 KB Output is correct
32 Correct 263 ms 21368 KB Output is correct
33 Correct 284 ms 20192 KB Output is correct
34 Correct 273 ms 20088 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 8960 KB Output is correct
2 Correct 9 ms 8960 KB Output is correct
3 Correct 9 ms 8960 KB Output is correct
4 Correct 10 ms 8960 KB Output is correct
5 Correct 9 ms 8960 KB Output is correct
6 Correct 9 ms 8960 KB Output is correct
7 Correct 10 ms 8960 KB Output is correct
8 Correct 9 ms 8960 KB Output is correct
9 Correct 10 ms 8960 KB Output is correct
10 Correct 9 ms 8960 KB Output is correct
11 Correct 10 ms 8960 KB Output is correct
12 Correct 10 ms 8960 KB Output is correct
13 Correct 9 ms 8960 KB Output is correct
14 Correct 10 ms 8960 KB Output is correct
15 Correct 9 ms 8960 KB Output is correct
16 Correct 9 ms 8960 KB Output is correct
17 Correct 10 ms 9012 KB Output is correct
18 Correct 9 ms 8960 KB Output is correct
19 Correct 9 ms 8960 KB Output is correct
20 Correct 10 ms 8992 KB Output is correct
21 Correct 11 ms 8960 KB Output is correct
22 Correct 10 ms 9088 KB Output is correct
23 Correct 10 ms 8960 KB Output is correct
24 Correct 10 ms 8960 KB Output is correct
25 Correct 10 ms 9088 KB Output is correct
26 Correct 10 ms 8960 KB Output is correct
27 Correct 10 ms 8960 KB Output is correct
28 Correct 10 ms 9088 KB Output is correct
29 Correct 10 ms 9120 KB Output is correct
30 Correct 10 ms 8960 KB Output is correct
31 Correct 10 ms 8960 KB Output is correct
32 Correct 10 ms 9120 KB Output is correct
33 Correct 11 ms 9048 KB Output is correct
34 Correct 10 ms 9088 KB Output is correct
35 Correct 10 ms 9088 KB Output is correct
36 Correct 10 ms 8960 KB Output is correct
37 Correct 11 ms 9088 KB Output is correct
38 Correct 10 ms 8960 KB Output is correct
39 Correct 180 ms 14968 KB Output is correct
40 Correct 171 ms 14968 KB Output is correct
41 Correct 210 ms 14968 KB Output is correct
42 Correct 207 ms 15132 KB Output is correct
43 Correct 107 ms 15224 KB Output is correct
44 Correct 78 ms 15108 KB Output is correct
45 Correct 151 ms 18552 KB Output is correct
46 Correct 110 ms 22264 KB Output is correct
47 Correct 191 ms 21240 KB Output is correct
48 Correct 331 ms 35576 KB Output is correct
49 Correct 318 ms 34296 KB Output is correct
50 Correct 204 ms 21112 KB Output is correct
51 Correct 191 ms 21216 KB Output is correct
52 Correct 263 ms 21368 KB Output is correct
53 Correct 284 ms 20192 KB Output is correct
54 Correct 273 ms 20088 KB Output is correct
55 Correct 19 ms 9600 KB Output is correct
56 Correct 20 ms 9600 KB Output is correct
57 Correct 97 ms 15192 KB Output is correct
58 Correct 52 ms 15248 KB Output is correct
59 Correct 112 ms 22308 KB Output is correct
60 Correct 672 ms 34912 KB Output is correct
61 Correct 224 ms 21240 KB Output is correct
62 Correct 269 ms 21196 KB Output is correct
63 Correct 398 ms 21240 KB Output is correct
64 Correct 721 ms 20988 KB Output is correct
65 Correct 304 ms 21112 KB Output is correct
66 Correct 489 ms 31776 KB Output is correct
67 Correct 149 ms 21476 KB Output is correct
68 Correct 339 ms 21432 KB Output is correct
69 Correct 338 ms 21624 KB Output is correct
70 Correct 329 ms 20836 KB Output is correct