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Submission #1040665

# Submission time Handle Problem Language Result Execution time Memory
1040665 2024-08-01T08:20:13 Z 우민규(#10996) The Ties That Guide Us (CEOI23_incursion) C++17
30 / 100
 232 ms 16948 KB 
#include <vector>
#include "incursion.h"
#include <cstdio>
#include <bits/stdc++.h>
using namespace std;

std::vector<int> mark(std::vector<std::pair<int, int>> f, int safe) {
  int n = f.size() + 1;
  safe -= 1;
  vector<int> sz(n), maxsz(n);
  vector<vector<int>> adj(n);
  vector<int> par(n, -1), to_safe(n, -2);
  for (auto [u, v] : f) {
    adj[u - 1].push_back(v - 1);
    adj[v - 1].push_back(u - 1);
  }
  function<void(int, int)> dfs_sz = [&](int node, int par) {
    sz[node] = 1;
    maxsz[node] = 0;
    for (auto v : adj[node]) {
      if (v == par) continue;
      dfs_sz(v, node);
      maxsz[node] = max(maxsz[node], sz[v]);
      sz[node] += sz[v];
    }
    maxsz[node] = max(maxsz[node], n - sz[node]);
  };
  dfs_sz(0, -1);
  // check centroid count
  int cent_req = *min_element(maxsz.begin(), maxsz.end());
  vector<int> centroids;
  for (int i = 0; i < n; ++i) {
    if (maxsz[i] == cent_req) {
      centroids.push_back(i);
    }
  }
  assert(0 < centroids.size() && centroids.size() <= 2);

  
  function<void(int, vector<int>&)> dfs_par = [&](int node, vector<int>& par) {
    for (auto v : adj[node]) {
      if (v == par[node]) continue;
      par[v] = node;
      dfs_par(v, par);
    }
  };

  dfs_par(centroids[0], par);
  dfs_par(safe, to_safe);
  if (centroids.size() == 2) {
    par[centroids[0]] = centroids[1];
  }
  vector<int> ret;
  // true -> go to parent
  // false -> go to other child
  for (int i = 0; i < n; ++i) {
    if (to_safe[i] == par[i]) {
      ret.push_back(true);
    } else {
      ret.push_back(false);
    }
  }

  return ret;
}

void locate(std::vector<std::pair<int, int>> F, int node, int t) {
  node -= 1;
  int n = F.size() + 1;
  vector<vector<int>> adj(n);
  vector<int> sz(n), maxsz(n);
  vector<int> par(n, -1);
  vector<bool> visited(n, false);
  visited[node] = true;
  for (auto [u, v] : F) {
    adj[u - 1].push_back(v - 1);
    adj[v - 1].push_back(u - 1);
  }

  function<void(int, int)> dfs_sz = [&](int node, int par) {
    sz[node] = 1;
    maxsz[node] = 0;
    for (auto v : adj[node]) {
      if (v == par) continue;
      dfs_sz(v, node);
      maxsz[node] = max(maxsz[node], sz[v]);
      sz[node] += sz[v];
    }
    maxsz[node] = max(maxsz[node], n - sz[node]);
  };
  dfs_sz(0, -1);
  // check centroid count
  int cent_req = *min_element(maxsz.begin(), maxsz.end());
  vector<int> centroids;
  for (int i = 0; i < n; ++i) {
    if (maxsz[i] == cent_req) {
      centroids.push_back(i);
    }
  }
  assert(0 < centroids.size() && centroids.size() <= 2);

  function<void(int, vector<int>&)> dfs_par = [&](int node, vector<int>& par) {
    for (auto v : adj[node]) {
      if (v == par[node]) continue;
      par[v] = node;
      dfs_par(v, par);
    }
  };
  dfs_par(centroids[0], par);

  if (centroids.size() == 2) {
    par[centroids[0]] = centroids[1];
  }

  auto go = [&](int node) {
    visited[node] = true;
    return visit(node + 1);
  };


  while (true) {
    if (t) {
      if (visited[par[node]]) {
        go(par[node]);
        break;
      }
      t = go(par[node]);
      node = par[node];
      continue;
    }
    // node the singular centroid
    // try all ways
    bool moved = false;
    for (auto v : adj[node]) {
      if (v == par[node]) continue;
      if (visited[v]) continue;
      int ct = go(v);
      if (ct) {
        go(node);
      } else {
        t = ct;
        node = v;
        moved = true;
        break;
      }
    }
    if (!moved) break;
  }
}

#ifndef EVAL
#include "sample_grader.cpp"
#endif

Compilation message

interface.cpp: In function 'int main()':
interface.cpp:44:55: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |     if(fread(T.data(), sizeof(int), 2 * N - 2, stdin) != 2 * N - 2) exit(0);
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
interface.cpp:50:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   50 |         int l = (numbers.size() == N ? N : 0);
      |                  ~~~~~~~~~~~~~~~^~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 764 KB Correct

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 189 ms 15328 KB Correct
2 Correct 185 ms 16236 KB Correct
3 Correct 107 ms 16432 KB Correct
4 Correct 87 ms 16416 KB Correct
5 Correct 175 ms 16412 KB Correct
6 Correct 80 ms 15968 KB Correct
7 Correct 92 ms 14188 KB Correct
8 Correct 187 ms 15464 KB Correct
9 Correct 197 ms 16948 KB Correct
10 Correct 128 ms 15112 KB Correct
11 Correct 100 ms 16200 KB Correct
12 Correct 216 ms 15288 KB Correct
13 Correct 87 ms 13976 KB Correct
14 Correct 86 ms 14420 KB Correct
15 Correct 232 ms 16204 KB Correct
16 Correct 188 ms 16792 KB Correct
17 Correct 115 ms 13916 KB Correct
18 Correct 87 ms 14176 KB Correct
19 Correct 139 ms 13952 KB Correct
20 Correct 86 ms 15788 KB Correct
21 Correct 82 ms 14492 KB Correct
22 Correct 178 ms 16116 KB Correct
23 Correct 195 ms 16660 KB Correct
24 Correct 91 ms 14500 KB Correct
25 Correct 79 ms 15196 KB Correct
26 Correct 101 ms 14100 KB Correct
27 Correct 70 ms 14432 KB Correct
28 Correct 82 ms 14960 KB Correct
29 Correct 199 ms 16868 KB Correct
30 Correct 186 ms 15300 KB Correct
31 Correct 84 ms 16288 KB Correct
32 Correct 202 ms 14912 KB Correct
33 Correct 207 ms 15336 KB Correct
34 Correct 81 ms 13856 KB Correct
35 Correct 66 ms 13324 KB Correct
36 Correct 211 ms 16072 KB Correct
37 Correct 203 ms 16888 KB Correct
38 Correct 229 ms 15744 KB Correct
39 Correct 130 ms 16364 KB Correct
40 Correct 153 ms 15584 KB Correct
41 Correct 75 ms 15260 KB Correct
42 Correct 75 ms 15244 KB Correct
43 Correct 172 ms 16332 KB Correct
44 Correct 193 ms 15452 KB Correct
45 Correct 80 ms 14496 KB Correct
46 Correct 64 ms 15456 KB Correct
47 Correct 89 ms 15628 KB Correct
48 Correct 76 ms 13464 KB Correct
49 Correct 68 ms 15832 KB Correct

Subtask #2
0.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 8792 KB Correct
2 Incorrect 69 ms 8736 KB Not correct
3 Halted 0 ms 0 KB -

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 764 KB Correct
2 Correct 189 ms 15328 KB Correct
3 Correct 185 ms 16236 KB Correct
4 Correct 107 ms 16432 KB Correct
5 Correct 87 ms 16416 KB Correct
6 Correct 175 ms 16412 KB Correct
7 Correct 80 ms 15968 KB Correct
8 Correct 92 ms 14188 KB Correct
9 Correct 187 ms 15464 KB Correct
10 Correct 197 ms 16948 KB Correct
11 Correct 128 ms 15112 KB Correct
12 Correct 100 ms 16200 KB Correct
13 Correct 216 ms 15288 KB Correct
14 Correct 87 ms 13976 KB Correct
15 Correct 86 ms 14420 KB Correct
16 Correct 232 ms 16204 KB Correct
17 Correct 188 ms 16792 KB Correct
18 Correct 115 ms 13916 KB Correct
19 Correct 87 ms 14176 KB Correct
20 Correct 139 ms 13952 KB Correct
21 Correct 86 ms 15788 KB Correct
22 Correct 82 ms 14492 KB Correct
23 Correct 178 ms 16116 KB Correct
24 Correct 195 ms 16660 KB Correct
25 Correct 91 ms 14500 KB Correct
26 Correct 79 ms 15196 KB Correct
27 Correct 101 ms 14100 KB Correct
28 Correct 70 ms 14432 KB Correct
29 Correct 82 ms 14960 KB Correct
30 Correct 199 ms 16868 KB Correct
31 Correct 186 ms 15300 KB Correct
32 Correct 84 ms 16288 KB Correct
33 Correct 202 ms 14912 KB Correct
34 Correct 207 ms 15336 KB Correct
35 Correct 81 ms 13856 KB Correct
36 Correct 66 ms 13324 KB Correct
37 Correct 211 ms 16072 KB Correct
38 Correct 203 ms 16888 KB Correct
39 Correct 229 ms 15744 KB Correct
40 Correct 130 ms 16364 KB Correct
41 Correct 153 ms 15584 KB Correct
42 Correct 75 ms 15260 KB Correct
43 Correct 75 ms 15244 KB Correct
44 Correct 172 ms 16332 KB Correct
45 Correct 193 ms 15452 KB Correct
46 Correct 80 ms 14496 KB Correct
47 Correct 64 ms 15456 KB Correct
48 Correct 89 ms 15628 KB Correct
49 Correct 76 ms 13464 KB Correct
50 Correct 68 ms 15832 KB Correct
51 Correct 71 ms 8792 KB Correct
52 Incorrect 69 ms 8736 KB Not correct
53 Halted 0 ms 0 KB -