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답안 #212471

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
212471 2020-03-23T05:29:22 Z _qVp_ 경주 (Race) (IOI11_race) C++14
21 / 100
 3000 ms 142664 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 2e5 + 10;
const int oo = 1e9;

typedef pair < int, int > II;

#define z id[j]

int sz[MAXN], depth[MAXN];
long long sum[MAXN];
vector < II > adj[MAXN];
vector < int > vec[MAXN];
map < long long, int > path;
int h[MAXN][2], l[MAXN], big[MAXN];
int n, k;
int ans = oo, cnt = 0;
int in[MAXN], out[MAXN], id[MAXN];

void dfs(int u, int p) {
	sz[u] = 1;
	in[u] = ++cnt;
	id[cnt] = u;
	for(auto cur : adj[u]) {
		int v = cur.first, w = cur.second;
		if (v == p)
			continue;
		depth[v] = depth[u] + 1;
		sum[v] = sum[u] + w;
		dfs(v, u);
		sz[u] += sz[v];
	}
	out[u] = cnt;
}

void modify(int u, int k) {
	long long sumNow = sum[u]; 
	if (k == -1) {
		path[sumNow] = 0;
	} else {
		int tmp = path[sumNow];
		if (tmp == 0)
			tmp = oo;
		path[sumNow] = min(tmp, depth[u]);
	}
}

void sack(int u, int p, int keep) {
	int szMax = -1, bigChild = -1;
	
	for(auto cur : adj[u]) {
		int v = cur.first;
		if (v == p)
			continue;
		if (sz[v] > szMax) {
			sz[v] = szMax;
			bigChild = v;
		}
	}
	
	for(auto cur : adj[u]) {
		int v = cur.first;
		if (v != bigChild && v != p)
			sack(v, u, 0);
	}
	
	if (bigChild != -1) {
		sack(bigChild, u, 1);
		big[bigChild] = 1;
	}
	
	for(auto cur : adj[u]) {
		int v = cur.first;
		if (v == p || v == bigChild)
			continue;
		for(int j = in[v]; j <= out[v]; j++) {
			long long need = k + sum[u] * 2 - sum[z];
			if (path[need]) 
				ans = min(ans, path[need] + depth[z] - 2 * depth[u]);
		}
		for(int j = in[v]; j <= out[v]; j++) {
			modify(z, 1);
		}
	}
	
	modify(u, 1);
	if (path[k + sum[u]])
			ans = min(ans, path[k + sum[u]] - depth[u]);
	if (bigChild != -1)
		big[bigChild] = 0;
	if (!keep) {
		for(int j = in[u]; j <= out[u]; j++) {
			modify(z, -1);
		}
	}
	
}

int solve() {
	dfs(0, -1);
	sack(0, -1, 1);
	return (ans == oo ? -1 : ans);
}

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], v = H[i][1], w = L[i];
		adj[u].push_back(II(v, w));
		adj[v].push_back(II(u, w));
	}
	return solve();
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9856 KB Output is correct
2 Correct 10 ms 9728 KB Output is correct
3 Correct 10 ms 9856 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 10 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 9 ms 9856 KB Output is correct
8 Correct 9 ms 9856 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9776 KB Output is correct
11 Correct 9 ms 9728 KB Output is correct
12 Correct 9 ms 9856 KB Output is correct
13 Correct 10 ms 9728 KB Output is correct
14 Correct 9 ms 9856 KB Output is correct
15 Correct 9 ms 9728 KB Output is correct
16 Correct 10 ms 9728 KB Output is correct
17 Correct 10 ms 9856 KB Output is correct
18 Correct 9 ms 9856 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9856 KB Output is correct
2 Correct 10 ms 9728 KB Output is correct
3 Correct 10 ms 9856 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 10 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 9 ms 9856 KB Output is correct
8 Correct 9 ms 9856 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9776 KB Output is correct
11 Correct 9 ms 9728 KB Output is correct
12 Correct 9 ms 9856 KB Output is correct
13 Correct 10 ms 9728 KB Output is correct
14 Correct 9 ms 9856 KB Output is correct
15 Correct 9 ms 9728 KB Output is correct
16 Correct 10 ms 9728 KB Output is correct
17 Correct 10 ms 9856 KB Output is correct
18 Correct 9 ms 9856 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 9 ms 9728 KB Output is correct
21 Correct 13 ms 9984 KB Output is correct
22 Correct 14 ms 10496 KB Output is correct
23 Correct 20 ms 11136 KB Output is correct
24 Correct 15 ms 10496 KB Output is correct
25 Correct 14 ms 10496 KB Output is correct
26 Correct 14 ms 10368 KB Output is correct
27 Correct 10 ms 9856 KB Output is correct
28 Correct 19 ms 10624 KB Output is correct
29 Correct 15 ms 10368 KB Output is correct
30 Correct 14 ms 10368 KB Output is correct
31 Correct 15 ms 10368 KB Output is correct
32 Correct 15 ms 10536 KB Output is correct
33 Correct 16 ms 10496 KB Output is correct
34 Correct 13 ms 10240 KB Output is correct
35 Correct 12 ms 10240 KB Output is correct
36 Correct 11 ms 10112 KB Output is correct
37 Correct 11 ms 9984 KB Output is correct
38 Correct 12 ms 10112 KB Output is correct

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9856 KB Output is correct
2 Correct 10 ms 9728 KB Output is correct
3 Correct 10 ms 9856 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 10 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 9 ms 9856 KB Output is correct
8 Correct 9 ms 9856 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9776 KB Output is correct
11 Correct 9 ms 9728 KB Output is correct
12 Correct 9 ms 9856 KB Output is correct
13 Correct 10 ms 9728 KB Output is correct
14 Correct 9 ms 9856 KB Output is correct
15 Correct 9 ms 9728 KB Output is correct
16 Correct 10 ms 9728 KB Output is correct
17 Correct 10 ms 9856 KB Output is correct
18 Correct 9 ms 9856 KB Output is correct
19 Correct 384 ms 17912 KB Output is correct
20 Correct 322 ms 17784 KB Output is correct
21 Correct 297 ms 17784 KB Output is correct
22 Correct 371 ms 17880 KB Output is correct
23 Correct 627 ms 18168 KB Output is correct
24 Correct 314 ms 17912 KB Output is correct
25 Correct 103 ms 24440 KB Output is correct
26 Correct 72 ms 29688 KB Output is correct
27 Correct 251 ms 26360 KB Output is correct
28 Correct 367 ms 87032 KB Output is correct
29 Correct 296 ms 73596 KB Output is correct
30 Correct 253 ms 26232 KB Output is correct
31 Correct 258 ms 26360 KB Output is correct
32 Correct 366 ms 26872 KB Output is correct
33 Correct 1042 ms 25424 KB Output is correct
34 Execution timed out 3091 ms 142664 KB Time limit exceeded

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9856 KB Output is correct
2 Correct 10 ms 9728 KB Output is correct
3 Correct 10 ms 9856 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 10 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 9 ms 9856 KB Output is correct
8 Correct 9 ms 9856 KB Output is correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9776 KB Output is correct
11 Correct 9 ms 9728 KB Output is correct
12 Correct 9 ms 9856 KB Output is correct
13 Correct 10 ms 9728 KB Output is correct
14 Correct 9 ms 9856 KB Output is correct
15 Correct 9 ms 9728 KB Output is correct
16 Correct 10 ms 9728 KB Output is correct
17 Correct 10 ms 9856 KB Output is correct
18 Correct 9 ms 9856 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 9 ms 9728 KB Output is correct
21 Correct 13 ms 9984 KB Output is correct
22 Correct 14 ms 10496 KB Output is correct
23 Correct 20 ms 11136 KB Output is correct
24 Correct 15 ms 10496 KB Output is correct
25 Correct 14 ms 10496 KB Output is correct
26 Correct 14 ms 10368 KB Output is correct
27 Correct 10 ms 9856 KB Output is correct
28 Correct 19 ms 10624 KB Output is correct
29 Correct 15 ms 10368 KB Output is correct
30 Correct 14 ms 10368 KB Output is correct
31 Correct 15 ms 10368 KB Output is correct
32 Correct 15 ms 10536 KB Output is correct
33 Correct 16 ms 10496 KB Output is correct
34 Correct 13 ms 10240 KB Output is correct
35 Correct 12 ms 10240 KB Output is correct
36 Correct 11 ms 10112 KB Output is correct
37 Correct 11 ms 9984 KB Output is correct
38 Correct 12 ms 10112 KB Output is correct
39 Correct 384 ms 17912 KB Output is correct
40 Correct 322 ms 17784 KB Output is correct
41 Correct 297 ms 17784 KB Output is correct
42 Correct 371 ms 17880 KB Output is correct
43 Correct 627 ms 18168 KB Output is correct
44 Correct 314 ms 17912 KB Output is correct
45 Correct 103 ms 24440 KB Output is correct
46 Correct 72 ms 29688 KB Output is correct
47 Correct 251 ms 26360 KB Output is correct
48 Correct 367 ms 87032 KB Output is correct
49 Correct 296 ms 73596 KB Output is correct
50 Correct 253 ms 26232 KB Output is correct
51 Correct 258 ms 26360 KB Output is correct
52 Correct 366 ms 26872 KB Output is correct
53 Correct 1042 ms 25424 KB Output is correct
54 Execution timed out 3091 ms 142664 KB Time limit exceeded