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Submission #1060746

# Submission time Handle Problem Language Result Execution time Memory
1060746 2024-08-15T21:48:20 Z MilosMilutinovic The Ties That Guide Us (CEOI23_incursion) C++17
60 / 100
 292 ms 16120 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];
      x = vector<int>(n, -1);
      Dfs(root, root);
      t = visit(root + 1);
      curr = 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] || u == cen[0]) {
        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 1016 KB Correct

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 237 ms 13632 KB Correct
2 Correct 227 ms 13796 KB Correct
3 Correct 113 ms 14912 KB Correct
4 Correct 112 ms 15540 KB Correct
5 Correct 204 ms 15212 KB Correct
6 Correct 87 ms 15352 KB Correct
7 Correct 81 ms 13376 KB Correct
8 Correct 222 ms 14144 KB Correct
9 Correct 223 ms 14632 KB Correct
10 Correct 158 ms 13892 KB Correct
11 Correct 103 ms 15652 KB Correct
12 Correct 292 ms 14000 KB Correct
13 Correct 92 ms 13228 KB Correct
14 Correct 89 ms 13632 KB Correct
15 Correct 202 ms 14908 KB Correct
16 Correct 218 ms 16120 KB Correct
17 Correct 136 ms 12624 KB Correct
18 Correct 94 ms 13560 KB Correct
19 Correct 163 ms 12980 KB Correct
20 Correct 79 ms 15196 KB Correct
21 Correct 82 ms 13832 KB Correct
22 Correct 220 ms 13984 KB Correct
23 Correct 211 ms 14072 KB Correct
24 Correct 98 ms 13568 KB Correct
25 Correct 99 ms 14656 KB Correct
26 Correct 96 ms 13228 KB Correct
27 Correct 84 ms 13900 KB Correct
28 Correct 87 ms 14512 KB Correct
29 Correct 195 ms 14376 KB Correct
30 Correct 223 ms 13008 KB Correct
31 Correct 98 ms 15276 KB Correct
32 Correct 235 ms 14368 KB Correct
33 Correct 239 ms 14736 KB Correct
34 Correct 89 ms 13256 KB Correct
35 Correct 81 ms 12788 KB Correct
36 Correct 211 ms 14320 KB Correct
37 Correct 234 ms 14312 KB Correct
38 Correct 269 ms 15144 KB Correct
39 Correct 148 ms 15780 KB Correct
40 Correct 185 ms 15368 KB Correct
41 Correct 77 ms 14596 KB Correct
42 Correct 84 ms 14272 KB Correct
43 Correct 217 ms 14584 KB Correct
44 Correct 212 ms 12592 KB Correct
45 Correct 87 ms 13372 KB Correct
46 Correct 86 ms 13796 KB Correct
47 Correct 102 ms 14576 KB Correct
48 Correct 90 ms 12844 KB Correct
49 Correct 88 ms 15168 KB Correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 8172 KB Correct
2 Correct 82 ms 8252 KB Correct
3 Correct 86 ms 7996 KB Correct
4 Correct 103 ms 12436 KB Correct
5 Correct 128 ms 12412 KB Correct
6 Correct 162 ms 12212 KB Correct
7 Correct 80 ms 7868 KB Correct
8 Correct 80 ms 8004 KB Correct
9 Correct 78 ms 8016 KB Correct
10 Correct 73 ms 7932 KB Correct
11 Correct 83 ms 7856 KB Correct
12 Correct 77 ms 7932 KB Correct
13 Correct 74 ms 7936 KB Correct
14 Correct 51 ms 6296 KB Correct
15 Correct 60 ms 6304 KB Correct
16 Correct 79 ms 7888 KB Correct
17 Correct 81 ms 7932 KB Correct
18 Correct 83 ms 7928 KB Correct
19 Correct 67 ms 7856 KB Correct
20 Correct 62 ms 6104 KB Correct
21 Correct 55 ms 6136 KB Correct
22 Correct 64 ms 6224 KB Correct
23 Correct 64 ms 6124 KB Correct
24 Correct 62 ms 6140 KB Correct
25 Correct 58 ms 6124 KB Correct
26 Correct 81 ms 8128 KB Correct
27 Correct 84 ms 8040 KB Correct
28 Correct 87 ms 7924 KB Correct
29 Correct 78 ms 7932 KB Correct
30 Correct 76 ms 7996 KB Correct
31 Correct 81 ms 7916 KB Correct
32 Correct 84 ms 8252 KB Correct
33 Correct 88 ms 7924 KB Correct
34 Correct 70 ms 8224 KB Correct
35 Correct 82 ms 7996 KB Correct
36 Correct 77 ms 8036 KB Correct
37 Correct 80 ms 8028 KB Correct
38 Correct 80 ms 7916 KB Correct
39 Correct 84 ms 8020 KB Correct
40 Correct 80 ms 7860 KB Correct
41 Correct 74 ms 7996 KB Correct
42 Correct 84 ms 8180 KB Correct
43 Correct 82 ms 7880 KB Correct
44 Correct 80 ms 7996 KB Correct
45 Correct 80 ms 8064 KB Correct
46 Correct 80 ms 7916 KB Correct
47 Correct 81 ms 7920 KB Correct
48 Correct 79 ms 7996 KB Correct
49 Correct 83 ms 8100 KB Correct
50 Correct 87 ms 8084 KB Correct
51 Correct 80 ms 8272 KB Correct
52 Correct 80 ms 8020 KB Correct
53 Correct 80 ms 7996 KB Correct
54 Correct 81 ms 8176 KB Correct
55 Correct 86 ms 8164 KB Correct
56 Correct 83 ms 8260 KB Correct
57 Correct 77 ms 8448 KB Correct
58 Correct 80 ms 8440 KB Correct
59 Correct 76 ms 8512 KB Correct
60 Correct 77 ms 8180 KB Correct
61 Correct 71 ms 8260 KB Correct
62 Correct 84 ms 8520 KB Correct
63 Correct 79 ms 8448 KB Correct
64 Correct 78 ms 8260 KB Correct
65 Correct 71 ms 8264 KB Correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 1016 KB Correct
2 Correct 237 ms 13632 KB Correct
3 Correct 227 ms 13796 KB Correct
4 Correct 113 ms 14912 KB Correct
5 Correct 112 ms 15540 KB Correct
6 Correct 204 ms 15212 KB Correct
7 Correct 87 ms 15352 KB Correct
8 Correct 81 ms 13376 KB Correct
9 Correct 222 ms 14144 KB Correct
10 Correct 223 ms 14632 KB Correct
11 Correct 158 ms 13892 KB Correct
12 Correct 103 ms 15652 KB Correct
13 Correct 292 ms 14000 KB Correct
14 Correct 92 ms 13228 KB Correct
15 Correct 89 ms 13632 KB Correct
16 Correct 202 ms 14908 KB Correct
17 Correct 218 ms 16120 KB Correct
18 Correct 136 ms 12624 KB Correct
19 Correct 94 ms 13560 KB Correct
20 Correct 163 ms 12980 KB Correct
21 Correct 79 ms 15196 KB Correct
22 Correct 82 ms 13832 KB Correct
23 Correct 220 ms 13984 KB Correct
24 Correct 211 ms 14072 KB Correct
25 Correct 98 ms 13568 KB Correct
26 Correct 99 ms 14656 KB Correct
27 Correct 96 ms 13228 KB Correct
28 Correct 84 ms 13900 KB Correct
29 Correct 87 ms 14512 KB Correct
30 Correct 195 ms 14376 KB Correct
31 Correct 223 ms 13008 KB Correct
32 Correct 98 ms 15276 KB Correct
33 Correct 235 ms 14368 KB Correct
34 Correct 239 ms 14736 KB Correct
35 Correct 89 ms 13256 KB Correct
36 Correct 81 ms 12788 KB Correct
37 Correct 211 ms 14320 KB Correct
38 Correct 234 ms 14312 KB Correct
39 Correct 269 ms 15144 KB Correct
40 Correct 148 ms 15780 KB Correct
41 Correct 185 ms 15368 KB Correct
42 Correct 77 ms 14596 KB Correct
43 Correct 84 ms 14272 KB Correct
44 Correct 217 ms 14584 KB Correct
45 Correct 212 ms 12592 KB Correct
46 Correct 87 ms 13372 KB Correct
47 Correct 86 ms 13796 KB Correct
48 Correct 102 ms 14576 KB Correct
49 Correct 90 ms 12844 KB Correct
50 Correct 88 ms 15168 KB Correct
51 Correct 91 ms 8172 KB Correct
52 Correct 82 ms 8252 KB Correct
53 Correct 86 ms 7996 KB Correct
54 Correct 103 ms 12436 KB Correct
55 Correct 128 ms 12412 KB Correct
56 Correct 162 ms 12212 KB Correct
57 Correct 80 ms 7868 KB Correct
58 Correct 80 ms 8004 KB Correct
59 Correct 78 ms 8016 KB Correct
60 Correct 73 ms 7932 KB Correct
61 Correct 83 ms 7856 KB Correct
62 Correct 77 ms 7932 KB Correct
63 Correct 74 ms 7936 KB Correct
64 Correct 51 ms 6296 KB Correct
65 Correct 60 ms 6304 KB Correct
66 Correct 79 ms 7888 KB Correct
67 Correct 81 ms 7932 KB Correct
68 Correct 83 ms 7928 KB Correct
69 Correct 67 ms 7856 KB Correct
70 Correct 62 ms 6104 KB Correct
71 Correct 55 ms 6136 KB Correct
72 Correct 64 ms 6224 KB Correct
73 Correct 64 ms 6124 KB Correct
74 Correct 62 ms 6140 KB Correct
75 Correct 58 ms 6124 KB Correct
76 Correct 81 ms 8128 KB Correct
77 Correct 84 ms 8040 KB Correct
78 Correct 87 ms 7924 KB Correct
79 Correct 78 ms 7932 KB Correct
80 Correct 76 ms 7996 KB Correct
81 Correct 81 ms 7916 KB Correct
82 Correct 84 ms 8252 KB Correct
83 Correct 88 ms 7924 KB Correct
84 Correct 70 ms 8224 KB Correct
85 Correct 82 ms 7996 KB Correct
86 Correct 77 ms 8036 KB Correct
87 Correct 80 ms 8028 KB Correct
88 Correct 80 ms 7916 KB Correct
89 Correct 84 ms 8020 KB Correct
90 Correct 80 ms 7860 KB Correct
91 Correct 74 ms 7996 KB Correct
92 Correct 84 ms 8180 KB Correct
93 Correct 82 ms 7880 KB Correct
94 Correct 80 ms 7996 KB Correct
95 Correct 80 ms 8064 KB Correct
96 Correct 80 ms 7916 KB Correct
97 Correct 81 ms 7920 KB Correct
98 Correct 79 ms 7996 KB Correct
99 Correct 83 ms 8100 KB Correct
100 Correct 87 ms 8084 KB Correct
101 Correct 80 ms 8272 KB Correct
102 Correct 80 ms 8020 KB Correct
103 Correct 80 ms 7996 KB Correct
104 Correct 81 ms 8176 KB Correct
105 Correct 86 ms 8164 KB Correct
106 Correct 83 ms 8260 KB Correct
107 Correct 77 ms 8448 KB Correct
108 Correct 80 ms 8440 KB Correct
109 Correct 76 ms 8512 KB Correct
110 Correct 77 ms 8180 KB Correct
111 Correct 71 ms 8260 KB Correct
112 Correct 84 ms 8520 KB Correct
113 Correct 79 ms 8448 KB Correct
114 Correct 78 ms 8260 KB Correct
115 Correct 71 ms 8264 KB Correct
116 Correct 77 ms 7944 KB Correct
117 Correct 81 ms 8188 KB Correct
118 Correct 84 ms 8192 KB Correct
119 Correct 83 ms 7940 KB Correct
120 Correct 75 ms 7936 KB Correct
121 Correct 84 ms 7940 KB Correct
122 Correct 83 ms 8004 KB Correct
123 Correct 84 ms 12280 KB Correct
124 Correct 130 ms 12356 KB Correct
125 Correct 169 ms 12428 KB Correct
126 Correct 79 ms 8004 KB Correct
127 Correct 80 ms 8004 KB Correct
128 Correct 86 ms 7768 KB Correct
129 Correct 79 ms 7940 KB Correct
130 Correct 78 ms 8000 KB Correct
131 Correct 78 ms 7908 KB Correct
132 Correct 76 ms 8176 KB Correct
133 Correct 62 ms 6236 KB Correct
134 Correct 60 ms 6096 KB Correct
135 Correct 78 ms 8012 KB Correct
136 Correct 86 ms 7932 KB Correct
137 Correct 80 ms 7844 KB Correct
138 Correct 73 ms 7928 KB Correct
139 Correct 54 ms 6056 KB Correct
140 Correct 56 ms 6132 KB Correct
141 Correct 62 ms 6000 KB Correct
142 Correct 53 ms 6132 KB Correct
143 Correct 59 ms 6152 KB Correct
144 Correct 49 ms 6140 KB Correct
145 Correct 80 ms 8000 KB Correct
146 Correct 77 ms 7996 KB Correct
147 Correct 80 ms 7936 KB Correct
148 Correct 74 ms 7940 KB Correct
149 Correct 87 ms 8180 KB Correct
150 Correct 84 ms 8180 KB Correct
151 Correct 82 ms 8088 KB Correct
152 Correct 79 ms 7940 KB Correct
153 Correct 80 ms 8000 KB Correct
154 Correct 79 ms 7996 KB Correct
155 Correct 88 ms 7904 KB Correct
156 Correct 86 ms 7852 KB Correct
157 Correct 73 ms 7936 KB Correct
158 Correct 79 ms 7928 KB Correct
159 Correct 83 ms 8132 KB Correct
160 Correct 87 ms 8064 KB Correct
161 Correct 78 ms 8016 KB Correct
162 Correct 88 ms 7932 KB Correct
163 Correct 79 ms 8000 KB Correct
164 Correct 67 ms 7928 KB Correct
165 Correct 78 ms 8148 KB Correct
166 Correct 80 ms 7936 KB Correct
167 Correct 86 ms 8092 KB Correct
168 Correct 86 ms 7912 KB Correct
169 Correct 80 ms 8000 KB Correct
170 Correct 78 ms 7916 KB Correct
171 Correct 77 ms 7952 KB Correct
172 Correct 73 ms 8096 KB Correct
173 Correct 86 ms 8104 KB Correct
174 Correct 86 ms 8084 KB Correct
175 Correct 84 ms 8452 KB Correct
176 Correct 79 ms 8276 KB Correct
177 Correct 79 ms 8448 KB Correct
178 Correct 82 ms 8428 KB Correct
179 Correct 74 ms 8260 KB Correct
180 Correct 78 ms 8256 KB Correct
181 Correct 90 ms 8388 KB Correct
182 Correct 79 ms 8512 KB Correct
183 Correct 80 ms 8188 KB Correct
184 Correct 78 ms 8192 KB Correct
185 Correct 203 ms 13312 KB Correct
186 Correct 188 ms 13796 KB Correct
187 Correct 114 ms 14664 KB Correct
188 Correct 120 ms 15352 KB Correct
189 Correct 199 ms 15076 KB Correct
190 Correct 83 ms 15356 KB Correct
191 Correct 83 ms 13564 KB Correct
192 Correct 219 ms 14016 KB Correct
193 Correct 207 ms 14908 KB Correct
194 Correct 159 ms 13776 KB Correct
195 Correct 123 ms 15516 KB Correct
196 Correct 264 ms 14000 KB Correct
197 Correct 102 ms 13172 KB Correct
198 Correct 101 ms 13600 KB Correct
199 Correct 207 ms 14716 KB Correct
200 Correct 203 ms 16116 KB Correct
201 Correct 129 ms 12768 KB Correct
202 Correct 103 ms 13292 KB Correct
203 Correct 147 ms 12888 KB Correct
204 Correct 94 ms 15216 KB Correct
205 Correct 88 ms 13956 KB Correct
206 Correct 226 ms 13884 KB Correct
207 Correct 189 ms 14180 KB Correct
208 Correct 105 ms 13776 KB Correct
209 Correct 93 ms 14748 KB Correct
210 Correct 94 ms 13288 KB Correct
211 Correct 92 ms 13888 KB Correct
212 Correct 87 ms 14144 KB Correct
213 Correct 223 ms 14500 KB Correct
214 Correct 230 ms 13004 KB Correct
215 Correct 99 ms 15812 KB Correct
216 Correct 242 ms 14560 KB Correct
217 Correct 247 ms 14736 KB Correct
218 Correct 92 ms 13132 KB Correct
219 Correct 86 ms 13060 KB Correct
220 Correct 220 ms 14384 KB Correct
221 Correct 205 ms 14396 KB Correct
222 Correct 254 ms 15240 KB Correct
223 Correct 155 ms 15568 KB Correct
224 Correct 210 ms 15088 KB Correct
225 Correct 83 ms 14696 KB Correct
226 Correct 95 ms 14668 KB Correct
227 Correct 244 ms 14288 KB Correct
228 Correct 232 ms 13108 KB Correct
229 Correct 93 ms 13308 KB Correct
230 Correct 93 ms 14048 KB Correct
231 Correct 98 ms 15008 KB Correct
232 Correct 87 ms 12868 KB Correct
233 Correct 94 ms 15168 KB Correct
234 Correct 101 ms 11428 KB Correct
235 Correct 113 ms 11416 KB Correct
236 Correct 60 ms 6304 KB Correct
237 Correct 60 ms 5864 KB Correct
238 Correct 56 ms 6136 KB Correct
239 Correct 43 ms 4808 KB Correct
240 Incorrect 65 ms 7876 KB Not correct
241 Halted 0 ms 0 KB -