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Submission #1060711

# Submission time Handle Problem Language Result Execution time Memory
1060711 2024-08-15T21:06:12 Z MilosMilutinovic The Ties That Guide Us (CEOI23_incursion) C++17
60 / 100
 294 ms 16196 KB 
#include "incursion.h"
#include <bits/stdc++.h>

using namespace std;

vector<int> mark(vector<pair<int, int>> e, int safe) {
  --safe;
  int n = (int) e.size() + 1;
  vector<vector<int>> g(n);
  for (int i = 0; i + 1 < n; i++) {
    --e[i].first; --e[i].second;
    g[e[i].first].push_back(e[i].second);
    g[e[i].second].push_back(e[i].first);
  }
  int root;
  {
    vector<int> sz(n);
    function<void(int, int)> Dfs = [&](int v, int pv) {
      sz[v] = 1;
      for (int u : g[v]) {
        if (u == pv) {
          continue;
        }
        Dfs(u, v);
        sz[v] += sz[u];
      }
    };
    Dfs(0, 0);
    vector<int> cen;
    function<int(int, int)> FindCentroid = [&](int v, int pv) {
      if (sz[v] * 2 == n) {
        cen.push_back(pv);
      }
      for (int u : g[v]) {
        if (u == pv || sz[u] * 2 < n) {
          continue;
        }
        return FindCentroid(u, v);
      }
      cen.push_back(v);
      return v;
    };
    root = FindCentroid(0, 0);
    if ((int) cen.size() == 2) {
      vector<int> que(1, safe);
      vector<bool> was(n);
      was[safe] = true;
      for (int b = 0; b < (int) que.size(); b++) {
        int i = que[b];
        if (i == cen[0] || i == cen[1]) {
          root = i;
          break;
        }
        for (int j : g[i]) {
          if (!was[j]) {
            que.push_back(j);
            was[j] = true;
          }
        }
      }
    }
  }
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    if ((int) g[i].size() == 2) {
      cnt += 1;
    }
  }
  if (cnt == 1) {
    for (int i = 0; i < n; i++) {
      if ((int) g[i].size() == 2) {
        root = i;
      }
    }
  }
  vector<int> dfn(n);
  vector<int> dfo(n);
  int T = -1;
  function<void(int, int)> Dfs = [&](int v, int pv) {
    dfn[v] = ++T;
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      Dfs(u, v);
    }
    dfo[v] = T;
  };
  Dfs(root, root);
  vector<int> seq(n);
  for (int i = 0; i < n; i++) {
    if (dfn[i] <= dfn[safe] && dfo[safe] <= dfo[i]) {
      seq[i] = 1;
    } else {
      seq[i] = 0;
    }
  }
  return seq;
}

void locate(vector<pair<int, int>> e, int curr, int t) {
  --curr;
  int n = (int) e.size() + 1;
  vector<vector<int>> g(n);
  for (int i = 0; i + 1 < n; i++) {
    --e[i].first; --e[i].second;
    g[e[i].first].push_back(e[i].second);
    g[e[i].second].push_back(e[i].first);
  }
  vector<int> cen;
  {
    vector<int> sz(n);
    function<void(int, int)> Dfs = [&](int v, int pv) {
      sz[v] = 1;
      for (int u : g[v]) {
        if (u == pv) {
          continue;
        }
        Dfs(u, v);
        sz[v] += sz[u];
      }
    };
    Dfs(0, 0);
    function<void(int, int)> Find = [&](int v, int pv) {
      if (sz[v] * 2 == n) {
        cen.push_back(pv);
      }
      for (int u : g[v]) {
        if (u == pv || sz[u] * 2 < n) {
          continue;
        }
        Find(u, v);
        return;
      }
      cen.push_back(v);
    };
    Find(0, 0);
  }
  int root = cen[0];
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    if ((int) g[i].size() == 2) {
      cnt += 1;
    }
  }
  if (cnt == 1) {
    for (int i = 0; i < n; i++) {
      if ((int) g[i].size() == 2) {
        root = i;
      }
    }
  }
  vector<int> x(n, -1);
  vector<int> pr(n);
  vector<int> sz(n);
  function<void(int, int)> Dfs = [&](int v, int pv) {
    pr[v] = pv;
    sz[v] = 1;
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      Dfs(u, v);
      sz[v] += sz[u];
      if (x[v] == -1 || sz[x[v]] < sz[u]) {
        x[v] = u;
      }
    }
  };
  Dfs(root, root);
  while (true) {
    if (curr == root && t == 0) {
      root = cen[1];
      Dfs(root, root);
      continue;
    }
    if (t == 0) {
      t = visit(pr[curr] + 1);
      curr = pr[curr];
      continue;
    }
    if (x[curr] == -1) {
      return;
    }
    int k = visit(x[curr] + 1);
    if (k == 1) {
      curr = x[curr];
      t = k;
      continue;
    }
    visit(curr + 1);
    bool found = false;
    for (int u : g[curr]) {
      if (u == pr[curr] || u == x[curr]) {
        continue;
      }
      int k = visit(u + 1);
      if (k == 1) {
        t = k;
        curr = u;
        found = true;
        break;
      }
      visit(curr + 1);
    }
    if (!found) {
      return;
    }
  }
}

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 768 KB Correct

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 205 ms 13372 KB Correct
2 Correct 180 ms 13764 KB Correct
3 Correct 119 ms 14728 KB Correct
4 Correct 115 ms 15580 KB Correct
5 Correct 199 ms 14832 KB Correct
6 Correct 84 ms 15420 KB Correct
7 Correct 83 ms 13628 KB Correct
8 Correct 217 ms 14068 KB Correct
9 Correct 223 ms 14716 KB Correct
10 Correct 150 ms 13796 KB Correct
11 Correct 103 ms 15588 KB Correct
12 Correct 294 ms 13808 KB Correct
13 Correct 83 ms 13236 KB Correct
14 Correct 86 ms 13636 KB Correct
15 Correct 238 ms 14828 KB Correct
16 Correct 227 ms 16164 KB Correct
17 Correct 133 ms 12860 KB Correct
18 Correct 96 ms 13472 KB Correct
19 Correct 145 ms 12724 KB Correct
20 Correct 84 ms 15100 KB Correct
21 Correct 89 ms 14136 KB Correct
22 Correct 209 ms 13884 KB Correct
23 Correct 221 ms 14140 KB Correct
24 Correct 90 ms 13572 KB Correct
25 Correct 92 ms 14708 KB Correct
26 Correct 101 ms 13472 KB Correct
27 Correct 84 ms 13628 KB Correct
28 Correct 87 ms 14140 KB Correct
29 Correct 206 ms 14444 KB Correct
30 Correct 221 ms 13120 KB Correct
31 Correct 94 ms 15604 KB Correct
32 Correct 254 ms 14388 KB Correct
33 Correct 262 ms 14740 KB Correct
34 Correct 80 ms 13308 KB Correct
35 Correct 83 ms 12608 KB Correct
36 Correct 216 ms 14160 KB Correct
37 Correct 230 ms 14328 KB Correct
38 Correct 268 ms 15420 KB Correct
39 Correct 156 ms 15328 KB Correct
40 Correct 174 ms 14856 KB Correct
41 Correct 82 ms 14580 KB Correct
42 Correct 83 ms 14532 KB Correct
43 Correct 216 ms 14352 KB Correct
44 Correct 201 ms 12348 KB Correct
45 Correct 90 ms 13628 KB Correct
46 Correct 94 ms 13968 KB Correct
47 Correct 100 ms 14568 KB Correct
48 Correct 88 ms 12604 KB Correct
49 Correct 81 ms 15240 KB Correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 81 ms 7940 KB Correct
2 Correct 77 ms 8184 KB Correct
3 Correct 80 ms 7944 KB Correct
4 Correct 92 ms 12460 KB Correct
5 Correct 141 ms 12284 KB Correct
6 Correct 176 ms 12348 KB Correct
7 Correct 79 ms 7952 KB Correct
8 Correct 87 ms 7924 KB Correct
9 Correct 68 ms 8008 KB Correct
10 Correct 77 ms 7844 KB Correct
11 Correct 80 ms 7936 KB Correct
12 Correct 79 ms 8112 KB Correct
13 Correct 71 ms 7852 KB Correct
14 Correct 61 ms 6228 KB Correct
15 Correct 49 ms 6156 KB Correct
16 Correct 82 ms 7928 KB Correct
17 Correct 82 ms 8008 KB Correct
18 Correct 78 ms 8008 KB Correct
19 Correct 79 ms 8004 KB Correct
20 Correct 61 ms 6136 KB Correct
21 Correct 56 ms 6040 KB Correct
22 Correct 61 ms 5980 KB Correct
23 Correct 62 ms 6116 KB Correct
24 Correct 60 ms 6168 KB Correct
25 Correct 64 ms 6028 KB Correct
26 Correct 82 ms 7852 KB Correct
27 Correct 81 ms 8184 KB Correct
28 Correct 82 ms 7916 KB Correct
29 Correct 79 ms 7928 KB Correct
30 Correct 78 ms 7924 KB Correct
31 Correct 81 ms 7996 KB Correct
32 Correct 88 ms 7932 KB Correct
33 Correct 74 ms 7864 KB Correct
34 Correct 78 ms 7932 KB Correct
35 Correct 83 ms 7928 KB Correct
36 Correct 81 ms 7996 KB Correct
37 Correct 73 ms 7996 KB Correct
38 Correct 75 ms 7856 KB Correct
39 Correct 78 ms 7996 KB Correct
40 Correct 83 ms 8208 KB Correct
41 Correct 88 ms 7832 KB Correct
42 Correct 75 ms 8060 KB Correct
43 Correct 80 ms 7932 KB Correct
44 Correct 79 ms 8008 KB Correct
45 Correct 79 ms 7996 KB Correct
46 Correct 77 ms 7996 KB Correct
47 Correct 77 ms 7940 KB Correct
48 Correct 84 ms 7928 KB Correct
49 Correct 76 ms 8104 KB Correct
50 Correct 74 ms 7928 KB Correct
51 Correct 87 ms 7860 KB Correct
52 Correct 89 ms 7916 KB Correct
53 Correct 79 ms 8008 KB Correct
54 Correct 79 ms 7928 KB Correct
55 Correct 78 ms 7928 KB Correct
56 Correct 80 ms 8508 KB Correct
57 Correct 80 ms 8260 KB Correct
58 Correct 79 ms 8468 KB Correct
59 Correct 81 ms 8336 KB Correct
60 Correct 76 ms 8260 KB Correct
61 Correct 76 ms 8176 KB Correct
62 Correct 79 ms 8444 KB Correct
63 Correct 82 ms 8424 KB Correct
64 Correct 82 ms 8104 KB Correct
65 Correct 76 ms 8184 KB Correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 768 KB Correct
2 Correct 205 ms 13372 KB Correct
3 Correct 180 ms 13764 KB Correct
4 Correct 119 ms 14728 KB Correct
5 Correct 115 ms 15580 KB Correct
6 Correct 199 ms 14832 KB Correct
7 Correct 84 ms 15420 KB Correct
8 Correct 83 ms 13628 KB Correct
9 Correct 217 ms 14068 KB Correct
10 Correct 223 ms 14716 KB Correct
11 Correct 150 ms 13796 KB Correct
12 Correct 103 ms 15588 KB Correct
13 Correct 294 ms 13808 KB Correct
14 Correct 83 ms 13236 KB Correct
15 Correct 86 ms 13636 KB Correct
16 Correct 238 ms 14828 KB Correct
17 Correct 227 ms 16164 KB Correct
18 Correct 133 ms 12860 KB Correct
19 Correct 96 ms 13472 KB Correct
20 Correct 145 ms 12724 KB Correct
21 Correct 84 ms 15100 KB Correct
22 Correct 89 ms 14136 KB Correct
23 Correct 209 ms 13884 KB Correct
24 Correct 221 ms 14140 KB Correct
25 Correct 90 ms 13572 KB Correct
26 Correct 92 ms 14708 KB Correct
27 Correct 101 ms 13472 KB Correct
28 Correct 84 ms 13628 KB Correct
29 Correct 87 ms 14140 KB Correct
30 Correct 206 ms 14444 KB Correct
31 Correct 221 ms 13120 KB Correct
32 Correct 94 ms 15604 KB Correct
33 Correct 254 ms 14388 KB Correct
34 Correct 262 ms 14740 KB Correct
35 Correct 80 ms 13308 KB Correct
36 Correct 83 ms 12608 KB Correct
37 Correct 216 ms 14160 KB Correct
38 Correct 230 ms 14328 KB Correct
39 Correct 268 ms 15420 KB Correct
40 Correct 156 ms 15328 KB Correct
41 Correct 174 ms 14856 KB Correct
42 Correct 82 ms 14580 KB Correct
43 Correct 83 ms 14532 KB Correct
44 Correct 216 ms 14352 KB Correct
45 Correct 201 ms 12348 KB Correct
46 Correct 90 ms 13628 KB Correct
47 Correct 94 ms 13968 KB Correct
48 Correct 100 ms 14568 KB Correct
49 Correct 88 ms 12604 KB Correct
50 Correct 81 ms 15240 KB Correct
51 Correct 81 ms 7940 KB Correct
52 Correct 77 ms 8184 KB Correct
53 Correct 80 ms 7944 KB Correct
54 Correct 92 ms 12460 KB Correct
55 Correct 141 ms 12284 KB Correct
56 Correct 176 ms 12348 KB Correct
57 Correct 79 ms 7952 KB Correct
58 Correct 87 ms 7924 KB Correct
59 Correct 68 ms 8008 KB Correct
60 Correct 77 ms 7844 KB Correct
61 Correct 80 ms 7936 KB Correct
62 Correct 79 ms 8112 KB Correct
63 Correct 71 ms 7852 KB Correct
64 Correct 61 ms 6228 KB Correct
65 Correct 49 ms 6156 KB Correct
66 Correct 82 ms 7928 KB Correct
67 Correct 82 ms 8008 KB Correct
68 Correct 78 ms 8008 KB Correct
69 Correct 79 ms 8004 KB Correct
70 Correct 61 ms 6136 KB Correct
71 Correct 56 ms 6040 KB Correct
72 Correct 61 ms 5980 KB Correct
73 Correct 62 ms 6116 KB Correct
74 Correct 60 ms 6168 KB Correct
75 Correct 64 ms 6028 KB Correct
76 Correct 82 ms 7852 KB Correct
77 Correct 81 ms 8184 KB Correct
78 Correct 82 ms 7916 KB Correct
79 Correct 79 ms 7928 KB Correct
80 Correct 78 ms 7924 KB Correct
81 Correct 81 ms 7996 KB Correct
82 Correct 88 ms 7932 KB Correct
83 Correct 74 ms 7864 KB Correct
84 Correct 78 ms 7932 KB Correct
85 Correct 83 ms 7928 KB Correct
86 Correct 81 ms 7996 KB Correct
87 Correct 73 ms 7996 KB Correct
88 Correct 75 ms 7856 KB Correct
89 Correct 78 ms 7996 KB Correct
90 Correct 83 ms 8208 KB Correct
91 Correct 88 ms 7832 KB Correct
92 Correct 75 ms 8060 KB Correct
93 Correct 80 ms 7932 KB Correct
94 Correct 79 ms 8008 KB Correct
95 Correct 79 ms 7996 KB Correct
96 Correct 77 ms 7996 KB Correct
97 Correct 77 ms 7940 KB Correct
98 Correct 84 ms 7928 KB Correct
99 Correct 76 ms 8104 KB Correct
100 Correct 74 ms 7928 KB Correct
101 Correct 87 ms 7860 KB Correct
102 Correct 89 ms 7916 KB Correct
103 Correct 79 ms 8008 KB Correct
104 Correct 79 ms 7928 KB Correct
105 Correct 78 ms 7928 KB Correct
106 Correct 80 ms 8508 KB Correct
107 Correct 80 ms 8260 KB Correct
108 Correct 79 ms 8468 KB Correct
109 Correct 81 ms 8336 KB Correct
110 Correct 76 ms 8260 KB Correct
111 Correct 76 ms 8176 KB Correct
112 Correct 79 ms 8444 KB Correct
113 Correct 82 ms 8424 KB Correct
114 Correct 82 ms 8104 KB Correct
115 Correct 76 ms 8184 KB Correct
116 Correct 84 ms 8180 KB Correct
117 Correct 87 ms 7996 KB Correct
118 Correct 77 ms 8000 KB Correct
119 Correct 86 ms 8256 KB Correct
120 Correct 78 ms 7996 KB Correct
121 Correct 86 ms 8188 KB Correct
122 Correct 90 ms 8080 KB Correct
123 Correct 92 ms 12092 KB Correct
124 Correct 143 ms 12280 KB Correct
125 Correct 170 ms 12604 KB Correct
126 Correct 80 ms 7940 KB Correct
127 Correct 80 ms 7932 KB Correct
128 Correct 77 ms 8028 KB Correct
129 Correct 78 ms 8008 KB Correct
130 Correct 78 ms 8000 KB Correct
131 Correct 82 ms 7836 KB Correct
132 Correct 77 ms 7872 KB Correct
133 Correct 54 ms 6044 KB Correct
134 Correct 62 ms 6144 KB Correct
135 Correct 77 ms 7936 KB Correct
136 Correct 77 ms 7940 KB Correct
137 Correct 81 ms 8000 KB Correct
138 Correct 86 ms 7760 KB Correct
139 Correct 56 ms 6048 KB Correct
140 Correct 59 ms 6132 KB Correct
141 Correct 54 ms 6292 KB Correct
142 Correct 60 ms 5944 KB Correct
143 Correct 53 ms 6140 KB Correct
144 Correct 56 ms 6388 KB Correct
145 Correct 81 ms 7996 KB Correct
146 Correct 73 ms 8044 KB Correct
147 Correct 83 ms 7920 KB Correct
148 Correct 84 ms 7932 KB Correct
149 Correct 89 ms 8264 KB Correct
150 Correct 77 ms 7928 KB Correct
151 Correct 84 ms 7928 KB Correct
152 Correct 79 ms 8140 KB Correct
153 Correct 86 ms 7936 KB Correct
154 Correct 88 ms 8116 KB Correct
155 Correct 83 ms 8156 KB Correct
156 Correct 86 ms 7924 KB Correct
157 Correct 90 ms 8132 KB Correct
158 Correct 86 ms 7928 KB Correct
159 Correct 80 ms 8000 KB Correct
160 Correct 88 ms 8076 KB Correct
161 Correct 80 ms 7928 KB Correct
162 Correct 75 ms 8012 KB Correct
163 Correct 77 ms 7984 KB Correct
164 Correct 79 ms 7940 KB Correct
165 Correct 69 ms 7924 KB Correct
166 Correct 86 ms 7864 KB Correct
167 Correct 87 ms 7924 KB Correct
168 Correct 79 ms 7924 KB Correct
169 Correct 82 ms 8000 KB Correct
170 Correct 87 ms 8008 KB Correct
171 Correct 89 ms 8000 KB Correct
172 Correct 80 ms 8128 KB Correct
173 Correct 81 ms 8384 KB Correct
174 Correct 81 ms 7944 KB Correct
175 Correct 68 ms 8380 KB Correct
176 Correct 68 ms 8008 KB Correct
177 Correct 78 ms 8436 KB Correct
178 Correct 78 ms 8660 KB Correct
179 Correct 81 ms 8260 KB Correct
180 Correct 77 ms 8272 KB Correct
181 Correct 80 ms 8508 KB Correct
182 Correct 84 ms 8512 KB Correct
183 Correct 81 ms 8200 KB Correct
184 Correct 71 ms 8172 KB Correct
185 Correct 213 ms 13500 KB Correct
186 Correct 204 ms 13804 KB Correct
187 Correct 100 ms 14908 KB Correct
188 Correct 124 ms 15536 KB Correct
189 Correct 211 ms 15312 KB Correct
190 Correct 86 ms 15420 KB Correct
191 Correct 96 ms 13652 KB Correct
192 Correct 238 ms 14008 KB Correct
193 Correct 209 ms 14640 KB Correct
194 Correct 156 ms 13816 KB Correct
195 Correct 96 ms 15596 KB Correct
196 Correct 272 ms 13808 KB Correct
197 Correct 84 ms 13140 KB Correct
198 Correct 79 ms 13844 KB Correct
199 Correct 228 ms 14560 KB Correct
200 Correct 217 ms 16196 KB Correct
201 Correct 132 ms 12800 KB Correct
202 Correct 106 ms 13552 KB Correct
203 Correct 156 ms 12880 KB Correct
204 Correct 87 ms 15252 KB Correct
205 Correct 90 ms 13884 KB Correct
206 Correct 203 ms 14012 KB Correct
207 Correct 215 ms 14060 KB Correct
208 Correct 99 ms 13572 KB Correct
209 Correct 97 ms 14760 KB Correct
210 Correct 89 ms 13212 KB Correct
211 Correct 79 ms 13632 KB Correct
212 Correct 88 ms 14148 KB Correct
213 Correct 210 ms 14440 KB Correct
214 Correct 199 ms 13080 KB Correct
215 Correct 103 ms 15356 KB Correct
216 Correct 247 ms 14384 KB Correct
217 Correct 259 ms 14720 KB Correct
218 Correct 84 ms 13376 KB Correct
219 Correct 86 ms 12868 KB Correct
220 Correct 209 ms 14264 KB Correct
221 Correct 219 ms 14404 KB Correct
222 Correct 261 ms 15304 KB Correct
223 Correct 159 ms 15536 KB Correct
224 Correct 187 ms 14936 KB Correct
225 Correct 88 ms 14588 KB Correct
226 Correct 88 ms 14400 KB Correct
227 Correct 197 ms 14352 KB Correct
228 Correct 208 ms 12600 KB Correct
229 Correct 92 ms 13288 KB Correct
230 Correct 103 ms 14168 KB Correct
231 Correct 102 ms 14624 KB Correct
232 Correct 89 ms 12804 KB Correct
233 Correct 84 ms 15164 KB Correct
234 Correct 102 ms 11324 KB Correct
235 Correct 111 ms 11356 KB Correct
236 Correct 61 ms 6168 KB Correct
237 Correct 54 ms 6132 KB Correct
238 Correct 59 ms 6232 KB Correct
239 Correct 41 ms 4840 KB Correct
240 Incorrect 79 ms 7996 KB Not correct
241 Halted 0 ms 0 KB -