oj.uz

Submission #304907

# Submission time Handle Problem Language Result Execution time Memory
304907 2020-09-22T07:40:36 Z model_code Stations (IOI20_stations) C++17
100 / 100
 1253 ms 1056 KB 
#include "stations.h"
#include <vector>

void rec(int index, int parent, int pre_order, int &number,
  std::vector<std::vector<int>>& con, std::vector<int>& labels) {
  if (pre_order) labels[index] = number++;
  for (int i : con[index]) {
    if (i == parent) continue;
    rec(i, index, !pre_order, number, con, labels);
  }
  if (!pre_order) labels[index] = number++;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
  std::vector<int> labels(n);
	std::vector<std::vector<int>> con(n, std::vector<int>());
  for (int i = 0; i < u.size(); i++) {
    con[u[i]].push_back(v[i]);
    con[v[i]].push_back(u[i]);
  }
  int number = 0;
  rec(0, -1, true, number, con, labels);
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
  if (c[0] > s) {
    // Case 1: node s is in pre_order level.
    // All the neighbors are higher than s.

    if (t < s) {
      // The target is smaller than the source.
      // The target is definitely not in this subtree, go to parent.
      return c.back();
    }

    if (t > c.back()) {
      // The target is higher than the largest neighbor.
      // The target cannot be in this subtree, go to parent.
      return c.back();
    }

    // The target is in this subtree.
    // Pick the smallest child that's at least the target.
    int next = 0;
    while (c[next] < t) next++;
    return c[next];
  }


  // Case 2: node s is in the post_order level.
  if (t < c[0]) {
    // The target is smaller than the pre_order root c[0],
    // thus not in this subtree, go to the root.
    return c[0];
  }

  if (t > s) {
    // The target is higher than this post_order value.
    // Thus it's not in this subtree, go to the root.
    return c[0];
  }

  int next = c.size() - 1;
  while (c[next] > t) next--;
	return c[next];
}

Compilation message

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for (int i = 0; i < u.size(); i++) {
      |                   ~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 647 ms 988 KB Output is correct
2 Correct 437 ms 1008 KB Output is correct
3 Correct 1253 ms 672 KB Output is correct
4 Correct 706 ms 884 KB Output is correct
5 Correct 745 ms 640 KB Output is correct
6 Correct 625 ms 968 KB Output is correct
7 Correct 669 ms 1056 KB Output is correct
8 Correct 1 ms 640 KB Output is correct
9 Correct 4 ms 904 KB Output is correct
10 Correct 0 ms 768 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 595 ms 760 KB Output is correct
2 Correct 600 ms 744 KB Output is correct
3 Correct 1011 ms 748 KB Output is correct
4 Correct 676 ms 740 KB Output is correct
5 Correct 709 ms 732 KB Output is correct
6 Correct 596 ms 808 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 667 ms 1016 KB Output is correct
2 Correct 583 ms 992 KB Output is correct
3 Correct 1196 ms 776 KB Output is correct
4 Correct 802 ms 896 KB Output is correct
5 Correct 724 ms 892 KB Output is correct
6 Correct 597 ms 1024 KB Output is correct
7 Correct 485 ms 888 KB Output is correct
8 Correct 3 ms 800 KB Output is correct
9 Correct 4 ms 768 KB Output is correct
10 Correct 1 ms 776 KB Output is correct
11 Correct 781 ms 768 KB Output is correct
12 Correct 538 ms 1024 KB Output is correct
13 Correct 502 ms 1024 KB Output is correct
14 Correct 527 ms 768 KB Output is correct
15 Correct 73 ms 744 KB Output is correct
16 Correct 104 ms 896 KB Output is correct
17 Correct 106 ms 768 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1124 ms 800 KB Output is correct
2 Correct 692 ms 768 KB Output is correct
3 Correct 760 ms 640 KB Output is correct
4 Correct 3 ms 672 KB Output is correct
5 Correct 4 ms 932 KB Output is correct
6 Correct 2 ms 816 KB Output is correct
7 Correct 845 ms 640 KB Output is correct
8 Correct 1075 ms 768 KB Output is correct
9 Correct 840 ms 640 KB Output is correct
10 Correct 876 ms 640 KB Output is correct
11 Correct 6 ms 776 KB Output is correct
12 Correct 6 ms 640 KB Output is correct
13 Correct 4 ms 640 KB Output is correct
14 Correct 2 ms 768 KB Output is correct
15 Correct 2 ms 640 KB Output is correct
16 Correct 533 ms 768 KB Output is correct
17 Correct 592 ms 788 KB Output is correct
18 Correct 699 ms 640 KB Output is correct
19 Correct 968 ms 904 KB Output is correct
20 Correct 720 ms 752 KB Output is correct

Subtask #5
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 682 ms 968 KB Output is correct
2 Correct 533 ms 1016 KB Output is correct
3 Correct 1059 ms 776 KB Output is correct
4 Correct 806 ms 808 KB Output is correct
5 Correct 883 ms 864 KB Output is correct
6 Correct 584 ms 1024 KB Output is correct
7 Correct 605 ms 768 KB Output is correct
8 Correct 3 ms 776 KB Output is correct
9 Correct 4 ms 680 KB Output is correct
10 Correct 0 ms 640 KB Output is correct
11 Correct 533 ms 776 KB Output is correct
12 Correct 592 ms 836 KB Output is correct
13 Correct 1109 ms 860 KB Output is correct
14 Correct 795 ms 640 KB Output is correct
15 Correct 923 ms 768 KB Output is correct
16 Correct 555 ms 760 KB Output is correct
17 Correct 771 ms 768 KB Output is correct
18 Correct 738 ms 1016 KB Output is correct
19 Correct 688 ms 1008 KB Output is correct
20 Correct 474 ms 916 KB Output is correct
21 Correct 76 ms 640 KB Output is correct
22 Correct 104 ms 916 KB Output is correct
23 Correct 140 ms 904 KB Output is correct
24 Correct 9 ms 640 KB Output is correct
25 Correct 11 ms 904 KB Output is correct
26 Correct 7 ms 928 KB Output is correct
27 Correct 5 ms 904 KB Output is correct
28 Correct 1 ms 640 KB Output is correct
29 Correct 555 ms 800 KB Output is correct
30 Correct 557 ms 640 KB Output is correct
31 Correct 641 ms 732 KB Output is correct
32 Correct 555 ms 904 KB Output is correct
33 Correct 541 ms 640 KB Output is correct
34 Correct 450 ms 768 KB Output is correct
35 Correct 456 ms 1024 KB Output is correct
36 Correct 614 ms 1024 KB Output is correct
37 Correct 521 ms 736 KB Output is correct
38 Correct 575 ms 1016 KB Output is correct
39 Correct 574 ms 764 KB Output is correct
40 Correct 551 ms 760 KB Output is correct
41 Correct 487 ms 920 KB Output is correct
42 Correct 81 ms 896 KB Output is correct
43 Correct 186 ms 904 KB Output is correct
44 Correct 153 ms 788 KB Output is correct
45 Correct 280 ms 776 KB Output is correct
46 Correct 300 ms 808 KB Output is correct
47 Correct 396 ms 1056 KB Output is correct
48 Correct 78 ms 844 KB Output is correct
49 Correct 79 ms 748 KB Output is correct