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Submission #833769

# Submission time Handle Problem Language Result Execution time Memory
833769 2023-08-22T08:32:31 Z Johann Stations (IOI20_stations) C++14
100 / 100
 1063 ms 872 KB 
#include "stations.h"
#include "bits/stdc++.h"
using namespace std;

typedef vector<int> vi;
typedef vector<vi> vvi;
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

int N, K, idx;
vvi adj;
vi in, out, parity;
void dfs(int v, int p)
{
	in[v] = idx++;
	parity[v] = parity[p] ^ 1;
	for (int u : adj[v])
		if (u != p)
			dfs(u, v);
	out[v] = idx++;
};

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v)
{
	K = k;
	N = n;
	adj.clear();
	adj.resize(N);
	for (int i = 0; i < N - 1; ++i)
		adj[u[i]].push_back(v[i]), adj[v[i]].push_back(u[i]);
	idx = 0;
	in.assign(N, -1), out.assign(N, -1), parity.assign(N, 0);
	dfs(0, 0);

	vi labels(N);
	for (int i = 0; i < n; i++)
		labels[i] = (parity[i]) ? in[i] : out[i];

	vi distinct(all(labels));
	sort(all(distinct));
	map<int, int> dict;
	for (int i = 0; i < sz(distinct); ++i)
		dict[distinct[i]] = i;
	for (int i = 0; i < sz(labels); ++i)
		labels[i] = dict[labels[i]];

	return labels;
}

int find_next_station(int s, int t, std::vector<int> c)
{
	if (s < c[0])
	{
		// s has in parity
		if (t < s)
			return c.back(); // parent with highest out value
		for (int i = 0; i < sz(c); ++i)
		{
			if (t <= c[i])
				return c[i];
		}
		return c.back();
	}
	else
	{
		// s has out parity
		if (t > s)
			return c[0];
		for (int i = sz(c) - 1; i >= 0; --i)
			if (t >= c[i])
				return c[i];
		return c[0];
	}
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 513 ms 672 KB Output is correct
2 Correct 485 ms 620 KB Output is correct
3 Correct 721 ms 420 KB Output is correct
4 Correct 651 ms 508 KB Output is correct
5 Correct 364 ms 416 KB Output is correct
6 Correct 315 ms 672 KB Output is correct
7 Correct 251 ms 632 KB Output is correct
8 Correct 1 ms 500 KB Output is correct
9 Correct 3 ms 496 KB Output is correct
10 Correct 0 ms 492 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 297 ms 544 KB Output is correct
2 Correct 456 ms 624 KB Output is correct
3 Correct 1000 ms 464 KB Output is correct
4 Correct 597 ms 420 KB Output is correct
5 Correct 420 ms 500 KB Output is correct
6 Correct 309 ms 712 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 375 ms 676 KB Output is correct
2 Correct 220 ms 544 KB Output is correct
3 Correct 1063 ms 420 KB Output is correct
4 Correct 618 ms 416 KB Output is correct
5 Correct 516 ms 416 KB Output is correct
6 Correct 339 ms 640 KB Output is correct
7 Correct 329 ms 636 KB Output is correct
8 Correct 2 ms 492 KB Output is correct
9 Correct 3 ms 500 KB Output is correct
10 Correct 1 ms 500 KB Output is correct
11 Correct 540 ms 416 KB Output is correct
12 Correct 530 ms 752 KB Output is correct
13 Correct 356 ms 748 KB Output is correct
14 Correct 257 ms 632 KB Output is correct
15 Correct 29 ms 460 KB Output is correct
16 Correct 45 ms 620 KB Output is correct
17 Correct 71 ms 680 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 497 ms 512 KB Output is correct
2 Correct 621 ms 416 KB Output is correct
3 Correct 707 ms 500 KB Output is correct
4 Correct 1 ms 496 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 0 ms 488 KB Output is correct
7 Correct 568 ms 504 KB Output is correct
8 Correct 766 ms 416 KB Output is correct
9 Correct 635 ms 500 KB Output is correct
10 Correct 399 ms 416 KB Output is correct
11 Correct 3 ms 492 KB Output is correct
12 Correct 4 ms 504 KB Output is correct
13 Correct 3 ms 492 KB Output is correct
14 Correct 2 ms 492 KB Output is correct
15 Correct 2 ms 492 KB Output is correct
16 Correct 342 ms 416 KB Output is correct
17 Correct 340 ms 504 KB Output is correct
18 Correct 445 ms 416 KB Output is correct
19 Correct 386 ms 416 KB Output is correct
20 Correct 380 ms 416 KB Output is correct

Subtask #5
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 366 ms 608 KB Output is correct
2 Correct 373 ms 696 KB Output is correct
3 Correct 682 ms 508 KB Output is correct
4 Correct 454 ms 420 KB Output is correct
5 Correct 378 ms 416 KB Output is correct
6 Correct 368 ms 684 KB Output is correct
7 Correct 372 ms 636 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 2 ms 420 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 403 ms 548 KB Output is correct
12 Correct 461 ms 544 KB Output is correct
13 Correct 812 ms 504 KB Output is correct
14 Correct 486 ms 416 KB Output is correct
15 Correct 481 ms 504 KB Output is correct
16 Correct 380 ms 544 KB Output is correct
17 Correct 423 ms 508 KB Output is correct
18 Correct 349 ms 764 KB Output is correct
19 Correct 413 ms 716 KB Output is correct
20 Correct 307 ms 544 KB Output is correct
21 Correct 45 ms 472 KB Output is correct
22 Correct 56 ms 620 KB Output is correct
23 Correct 80 ms 544 KB Output is correct
24 Correct 3 ms 500 KB Output is correct
25 Correct 4 ms 492 KB Output is correct
26 Correct 3 ms 500 KB Output is correct
27 Correct 2 ms 500 KB Output is correct
28 Correct 0 ms 492 KB Output is correct
29 Correct 498 ms 416 KB Output is correct
30 Correct 310 ms 416 KB Output is correct
31 Correct 399 ms 504 KB Output is correct
32 Correct 342 ms 504 KB Output is correct
33 Correct 349 ms 500 KB Output is correct
34 Correct 246 ms 672 KB Output is correct
35 Correct 295 ms 872 KB Output is correct
36 Correct 323 ms 708 KB Output is correct
37 Correct 328 ms 720 KB Output is correct
38 Correct 398 ms 716 KB Output is correct
39 Correct 399 ms 720 KB Output is correct
40 Correct 399 ms 632 KB Output is correct
41 Correct 380 ms 716 KB Output is correct
42 Correct 44 ms 576 KB Output is correct
43 Correct 102 ms 548 KB Output is correct
44 Correct 97 ms 544 KB Output is correct
45 Correct 117 ms 544 KB Output is correct
46 Correct 284 ms 544 KB Output is correct
47 Correct 220 ms 632 KB Output is correct
48 Correct 41 ms 804 KB Output is correct
49 Correct 49 ms 676 KB Output is correct