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답안 #133500

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
133500 2019-07-20T23:32:39 Z KieranHorgan 경주 (Race) (IOI11_race) C++17
100 / 100
 966 ms 33556 KB 
#include "race.h"
#include <bits/stdc++.h>
using namespace std;

int n, k;
vector<pair<int,int>> AdjList[200005];
bitset<200005> marked;
int sz[200005];

int getSz(int u, int p) {
	sz[u] = 1;
	for(auto v: AdjList[u]) {
		if(v.first==p) continue;
		if(marked[v.first]) continue;
		sz[u] += getSz(v.first, u);
	}
	return sz[u];
}

int getCentroid(int u, int p, int compSz) {
	if(sz[u]*2 < compSz)
		return -1;
	for(auto v: AdjList[u]) {
		if(v.first==p) continue;
		if(marked[v.first]) continue;
		if(sz[v.first]*2 > compSz)
			return getCentroid(v.first, u, compSz);
	}
	return u;
}

int dp[1000005];
int ans = 1<<29;

void checkSecondLeg(int u, int p, int d, int l) {
	ans = min(ans, l + dp[k-d]);
	for(auto v: AdjList[u]) {
		if(v.first==p) continue;
		if(marked[v.first]) continue;
		if(d+v.second > k) continue;
		checkSecondLeg(v.first, u, d+v.second, l+1);
	}
}
void markFirstLeg(int u, int p, int d, int l) {
	dp[d] = min(dp[d], l);
	for(auto v: AdjList[u]) {
		if(v.first==p) continue;
		if(marked[v.first]) continue;
		if(d+v.second > k) continue;
		markFirstLeg(v.first, u, d+v.second, l+1);
	}
}
void unmarkFirstLeg(int u, int p, int d, int l) {
	dp[d] = 1<<29;
	for(auto v: AdjList[u]) {
		if(v.first==p) continue;
		if(marked[v.first]) continue;
		if(d+v.second > k) continue;
		unmarkFirstLeg(v.first, u, d+v.second, l+1);
	}
}

bitset<200005> vis;
void markVis(int u, int p) {
	vis[u] = 1;
	for(auto v: AdjList[u]) {
		if(v.first == p)
			continue;
		if(marked[v.first])
			continue;
		if(vis[v.first])
			continue;
		markVis(v.first, u);
	}
}
void unmarkVis(int u, int p) {
	vis[u] = 0;
	for(auto v: AdjList[u]) {
		if(v.first == p)
			continue;
		if(marked[v.first])
			continue;
		unmarkVis(v.first, u);
	}
}

int best_path(int N, int K, int H[][2], int L[]) {
	n = N;
	k = K;
	for(int i = 0; i < N-1; i++) {
		AdjList[H[i][0]].push_back({H[i][1], L[i]});
		AdjList[H[i][1]].push_back({H[i][0], L[i]});
	}

	ans = 1<<29;

	for(int i = 1; i <= K; i++)
		dp[i] = 1<<29;
	dp[0] = 0;

	queue<int> q;
	q.push(0);
	while(!q.empty()) {
		int u = q.front();
		q.pop();

		getSz(u, -1);

		int centre = getCentroid(u, -1, sz[u]);

		for(auto v: AdjList[centre]) {
			if(marked[v.first])
				continue;
			if(v.second > k) continue;
			checkSecondLeg(v.first, centre, v.second, 1);
			markFirstLeg(v.first, centre, v.second, 1);
		}
		for(auto v: AdjList[centre]) {
			if(marked[v.first])
				continue;
			if(v.second > k) continue;
			unmarkFirstLeg(v.first, centre, v.second, 1);
		}
		dp[0] = 0;

		for(auto v: AdjList[centre]) {
			if(marked[v.first])
				continue;
			// if(vis[v.first])
				// continue;
			q.push(v.first);
		}
		marked[centre]=1;
	}

	if(ans == 1<<29)
		ans = -1;
	return ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4984 KB Output is correct
4 Correct 6 ms 5112 KB Output is correct
5 Correct 6 ms 5112 KB Output is correct
6 Correct 7 ms 4984 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 7 ms 5112 KB Output is correct
9 Correct 7 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4988 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 7 ms 4984 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4984 KB Output is correct
4 Correct 6 ms 5112 KB Output is correct
5 Correct 6 ms 5112 KB Output is correct
6 Correct 7 ms 4984 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 7 ms 5112 KB Output is correct
9 Correct 7 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4988 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 7 ms 4984 KB Output is correct
19 Correct 6 ms 5112 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8696 KB Output is correct
23 Correct 9 ms 8056 KB Output is correct
24 Correct 10 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 8 ms 6392 KB Output is correct
27 Correct 12 ms 8248 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 8 ms 6436 KB Output is correct
30 Correct 8 ms 6520 KB Output is correct
31 Correct 9 ms 7672 KB Output is correct
32 Correct 10 ms 7928 KB Output is correct
33 Correct 10 ms 8184 KB Output is correct
34 Correct 9 ms 7416 KB Output is correct
35 Correct 10 ms 8312 KB Output is correct
36 Correct 10 ms 8824 KB Output is correct
37 Correct 9 ms 8184 KB Output is correct
38 Correct 8 ms 7032 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4984 KB Output is correct
4 Correct 6 ms 5112 KB Output is correct
5 Correct 6 ms 5112 KB Output is correct
6 Correct 7 ms 4984 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 7 ms 5112 KB Output is correct
9 Correct 7 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4988 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 7 ms 4984 KB Output is correct
19 Correct 182 ms 11716 KB Output is correct
20 Correct 243 ms 11932 KB Output is correct
21 Correct 194 ms 11772 KB Output is correct
22 Correct 175 ms 11768 KB Output is correct
23 Correct 234 ms 12192 KB Output is correct
24 Correct 78 ms 12152 KB Output is correct
25 Correct 294 ms 14584 KB Output is correct
26 Correct 141 ms 17528 KB Output is correct
27 Correct 364 ms 18836 KB Output is correct
28 Correct 600 ms 30456 KB Output is correct
29 Correct 500 ms 29432 KB Output is correct
30 Correct 255 ms 18936 KB Output is correct
31 Correct 273 ms 18996 KB Output is correct
32 Correct 381 ms 18936 KB Output is correct
33 Correct 520 ms 17916 KB Output is correct
34 Correct 439 ms 18680 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4984 KB Output is correct
4 Correct 6 ms 5112 KB Output is correct
5 Correct 6 ms 5112 KB Output is correct
6 Correct 7 ms 4984 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 7 ms 5112 KB Output is correct
9 Correct 7 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4988 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 7 ms 4984 KB Output is correct
19 Correct 6 ms 5112 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8696 KB Output is correct
23 Correct 9 ms 8056 KB Output is correct
24 Correct 10 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 8 ms 6392 KB Output is correct
27 Correct 12 ms 8248 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 8 ms 6436 KB Output is correct
30 Correct 8 ms 6520 KB Output is correct
31 Correct 9 ms 7672 KB Output is correct
32 Correct 10 ms 7928 KB Output is correct
33 Correct 10 ms 8184 KB Output is correct
34 Correct 9 ms 7416 KB Output is correct
35 Correct 10 ms 8312 KB Output is correct
36 Correct 10 ms 8824 KB Output is correct
37 Correct 9 ms 8184 KB Output is correct
38 Correct 8 ms 7032 KB Output is correct
39 Correct 182 ms 11716 KB Output is correct
40 Correct 243 ms 11932 KB Output is correct
41 Correct 194 ms 11772 KB Output is correct
42 Correct 175 ms 11768 KB Output is correct
43 Correct 234 ms 12192 KB Output is correct
44 Correct 78 ms 12152 KB Output is correct
45 Correct 294 ms 14584 KB Output is correct
46 Correct 141 ms 17528 KB Output is correct
47 Correct 364 ms 18836 KB Output is correct
48 Correct 600 ms 30456 KB Output is correct
49 Correct 500 ms 29432 KB Output is correct
50 Correct 255 ms 18936 KB Output is correct
51 Correct 273 ms 18996 KB Output is correct
52 Correct 381 ms 18936 KB Output is correct
53 Correct 520 ms 17916 KB Output is correct
54 Correct 439 ms 18680 KB Output is correct
55 Correct 18 ms 5752 KB Output is correct
56 Correct 20 ms 5624 KB Output is correct
57 Correct 106 ms 12152 KB Output is correct
58 Correct 48 ms 12012 KB Output is correct
59 Correct 136 ms 18200 KB Output is correct
60 Correct 966 ms 33556 KB Output is correct
61 Correct 298 ms 19168 KB Output is correct
62 Correct 340 ms 22904 KB Output is correct
63 Correct 630 ms 23032 KB Output is correct
64 Correct 868 ms 21240 KB Output is correct
65 Correct 364 ms 19704 KB Output is correct
66 Correct 816 ms 31444 KB Output is correct
67 Correct 147 ms 24168 KB Output is correct
68 Correct 432 ms 23816 KB Output is correct
69 Correct 446 ms 24156 KB Output is correct
70 Correct 402 ms 23424 KB Output is correct