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Submission #308707

# Submission time Handle Problem Language Result Execution time Memory
308707 2020-10-01T17:40:35 Z lacito Stations (IOI20_stations) C++14
100 / 100
 1210 ms 1028 KB 
#include "stations.h"
#include <algorithm>
#include <vector>

using namespace std;

vector<vector<int>> g;
vector<int> intime, outtime, depth;
int time;

void dfs(int v) {
    intime[v] = time++;
    for (int x : g[v])
        if (intime[x] == -1) {
            depth[x] = depth[v] + 1;
            dfs(x);
        }
    outtime[v] = time++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	g.assign(n, {});
	intime.assign(n, -1);
	outtime.assign(n, -1);
	depth.assign(n, 0);
	for (int i = 0; i < n - 1; i++) {
        g[u[i]].push_back(v[i]);
        g[v[i]].push_back(u[i]);
	}
	time = 0;
	dfs(0);
	vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = depth[i] % 2 == 0 ? intime[i] / 2 : outtime[i] / 2;
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    // sort(c.begin(), c.end()); they are already sorted
    if (s < c[0]) {
        // s: intime, c[i]: outtime, c.back(): parent of s
        // subtree of s: s < t <= c[c.size() - 2],
        // except if s==0 (root), but the below code is correct for it, too
        if (t < s || c.size() == 1 || t > c[c.size() - 2])
            return c.back();
        return *lower_bound(c.begin(), c.end(), t);
    } else {
        // s: outtime, c[i]: intime, c[0]: parent of s
        // subtree of s: c[1] <= t < s
        if (t > s || c.size() == 1 || t < c[1])
            return c[0];
        return *(upper_bound(c.begin(), c.end(), t) - 1);
    }

}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 718 ms 776 KB Output is correct
2 Correct 426 ms 1024 KB Output is correct
3 Correct 911 ms 640 KB Output is correct
4 Correct 689 ms 640 KB Output is correct
5 Correct 785 ms 656 KB Output is correct
6 Correct 481 ms 768 KB Output is correct
7 Correct 558 ms 792 KB Output is correct
8 Correct 3 ms 664 KB Output is correct
9 Correct 4 ms 640 KB Output is correct
10 Correct 0 ms 640 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 507 ms 768 KB Output is correct
2 Correct 614 ms 824 KB Output is correct
3 Correct 1097 ms 640 KB Output is correct
4 Correct 658 ms 640 KB Output is correct
5 Correct 802 ms 680 KB Output is correct
6 Correct 498 ms 900 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 583 ms 960 KB Output is correct
2 Correct 464 ms 1008 KB Output is correct
3 Correct 867 ms 736 KB Output is correct
4 Correct 716 ms 640 KB Output is correct
5 Correct 613 ms 744 KB Output is correct
6 Correct 604 ms 768 KB Output is correct
7 Correct 610 ms 760 KB Output is correct
8 Correct 3 ms 640 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 2 ms 724 KB Output is correct
11 Correct 601 ms 640 KB Output is correct
12 Correct 586 ms 836 KB Output is correct
13 Correct 518 ms 960 KB Output is correct
14 Correct 426 ms 768 KB Output is correct
15 Correct 57 ms 640 KB Output is correct
16 Correct 59 ms 768 KB Output is correct
17 Correct 111 ms 768 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 861 ms 736 KB Output is correct
2 Correct 729 ms 640 KB Output is correct
3 Correct 684 ms 640 KB Output is correct
4 Correct 3 ms 640 KB Output is correct
5 Correct 4 ms 640 KB Output is correct
6 Correct 2 ms 640 KB Output is correct
7 Correct 634 ms 640 KB Output is correct
8 Correct 1210 ms 640 KB Output is correct
9 Correct 726 ms 640 KB Output is correct
10 Correct 828 ms 640 KB Output is correct
11 Correct 5 ms 640 KB Output is correct
12 Correct 6 ms 640 KB Output is correct
13 Correct 6 ms 656 KB Output is correct
14 Correct 5 ms 672 KB Output is correct
15 Correct 1 ms 640 KB Output is correct
16 Correct 679 ms 656 KB Output is correct
17 Correct 686 ms 640 KB Output is correct
18 Correct 593 ms 640 KB Output is correct
19 Correct 621 ms 640 KB Output is correct
20 Correct 609 ms 656 KB Output is correct

Subtask #5
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 707 ms 1008 KB Output is correct
2 Correct 705 ms 1008 KB Output is correct
3 Correct 1152 ms 640 KB Output is correct
4 Correct 854 ms 640 KB Output is correct
5 Correct 738 ms 640 KB Output is correct
6 Correct 693 ms 760 KB Output is correct
7 Correct 625 ms 768 KB Output is correct
8 Correct 3 ms 640 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 1 ms 640 KB Output is correct
11 Correct 467 ms 780 KB Output is correct
12 Correct 760 ms 768 KB Output is correct
13 Correct 1019 ms 744 KB Output is correct
14 Correct 771 ms 652 KB Output is correct
15 Correct 542 ms 640 KB Output is correct
16 Correct 397 ms 768 KB Output is correct
17 Correct 790 ms 640 KB Output is correct
18 Correct 588 ms 768 KB Output is correct
19 Correct 549 ms 788 KB Output is correct
20 Correct 607 ms 768 KB Output is correct
21 Correct 72 ms 652 KB Output is correct
22 Correct 95 ms 848 KB Output is correct
23 Correct 134 ms 768 KB Output is correct
24 Correct 6 ms 656 KB Output is correct
25 Correct 3 ms 640 KB Output is correct
26 Correct 4 ms 656 KB Output is correct
27 Correct 5 ms 640 KB Output is correct
28 Correct 2 ms 640 KB Output is correct
29 Correct 640 ms 736 KB Output is correct
30 Correct 725 ms 648 KB Output is correct
31 Correct 722 ms 736 KB Output is correct
32 Correct 492 ms 664 KB Output is correct
33 Correct 485 ms 748 KB Output is correct
34 Correct 354 ms 1024 KB Output is correct
35 Correct 439 ms 768 KB Output is correct
36 Correct 466 ms 1008 KB Output is correct
37 Correct 638 ms 784 KB Output is correct
38 Correct 473 ms 772 KB Output is correct
39 Correct 469 ms 800 KB Output is correct
40 Correct 480 ms 768 KB Output is correct
41 Correct 487 ms 768 KB Output is correct
42 Correct 83 ms 768 KB Output is correct
43 Correct 146 ms 768 KB Output is correct
44 Correct 125 ms 768 KB Output is correct
45 Correct 225 ms 976 KB Output is correct
46 Correct 301 ms 768 KB Output is correct
47 Correct 324 ms 768 KB Output is correct
48 Correct 63 ms 788 KB Output is correct
49 Correct 60 ms 1028 KB Output is correct