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Submission #1060744

# Submission time Handle Problem Language Result Execution time Memory
1060744 2024-08-15T21:46:08 Z MilosMilutinovic The Ties That Guide Us (CEOI23_incursion) C++17
60 / 100
 286 ms 16188 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);
  int Q = 0;
  while (true) {
    if (curr == root && t == 0) {
      root = cen[1];
      x = vector<int>(n, -1);
      Dfs(root, root);
      t = visit(root + 1);
      assert(t == 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;
    }
    Q += 2;
    assert(Q <= 30);
    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;
      }
      Q += 2;
      assert(Q <= 30);
      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 199 ms 13400 KB Correct
2 Correct 206 ms 13752 KB Correct
3 Correct 103 ms 14576 KB Correct
4 Correct 106 ms 15580 KB Correct
5 Correct 196 ms 15268 KB Correct
6 Correct 93 ms 15356 KB Correct
7 Correct 79 ms 13740 KB Correct
8 Correct 220 ms 14072 KB Correct
9 Correct 221 ms 14908 KB Correct
10 Correct 154 ms 13884 KB Correct
11 Correct 102 ms 15532 KB Correct
12 Correct 239 ms 13820 KB Correct
13 Correct 84 ms 13116 KB Correct
14 Correct 78 ms 13636 KB Correct
15 Correct 206 ms 14796 KB Correct
16 Correct 213 ms 16188 KB Correct
17 Correct 129 ms 12692 KB Correct
18 Correct 99 ms 13796 KB Correct
19 Correct 168 ms 13060 KB Correct
20 Correct 84 ms 15104 KB Correct
21 Correct 82 ms 13884 KB Correct
22 Correct 213 ms 13964 KB Correct
23 Correct 214 ms 14184 KB Correct
24 Correct 115 ms 13616 KB Correct
25 Correct 102 ms 14760 KB Correct
26 Correct 97 ms 13288 KB Correct
27 Correct 88 ms 13892 KB Correct
28 Correct 84 ms 14368 KB Correct
29 Correct 238 ms 14448 KB Correct
30 Correct 235 ms 13072 KB Correct
31 Correct 93 ms 15420 KB Correct
32 Correct 249 ms 14376 KB Correct
33 Correct 249 ms 14800 KB Correct
34 Correct 88 ms 13300 KB Correct
35 Correct 94 ms 12684 KB Correct
36 Correct 214 ms 14160 KB Correct
37 Correct 222 ms 14464 KB Correct
38 Correct 270 ms 15364 KB Correct
39 Correct 147 ms 15520 KB Correct
40 Correct 210 ms 15032 KB Correct
41 Correct 87 ms 14584 KB Correct
42 Correct 86 ms 14444 KB Correct
43 Correct 225 ms 14396 KB Correct
44 Correct 207 ms 12792 KB Correct
45 Correct 90 ms 13248 KB Correct
46 Correct 93 ms 13828 KB Correct
47 Correct 102 ms 14836 KB Correct
48 Correct 87 ms 13036 KB Correct
49 Correct 86 ms 15164 KB Correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 7944 KB Correct
2 Correct 82 ms 7932 KB Correct
3 Correct 81 ms 8132 KB Correct
4 Correct 92 ms 11968 KB Correct
5 Correct 141 ms 12280 KB Correct
6 Correct 158 ms 12284 KB Correct
7 Correct 76 ms 7924 KB Correct
8 Correct 89 ms 7932 KB Correct
9 Correct 82 ms 7940 KB Correct
10 Correct 77 ms 7924 KB Correct
11 Correct 79 ms 7996 KB Correct
12 Correct 78 ms 8128 KB Correct
13 Correct 79 ms 8032 KB Correct
14 Correct 60 ms 6116 KB Correct
15 Correct 61 ms 6140 KB Correct
16 Correct 86 ms 7932 KB Correct
17 Correct 80 ms 8024 KB Correct
18 Correct 73 ms 7940 KB Correct
19 Correct 86 ms 8028 KB Correct
20 Correct 54 ms 6044 KB Correct
21 Correct 60 ms 5884 KB Correct
22 Correct 56 ms 6272 KB Correct
23 Correct 59 ms 6136 KB Correct
24 Correct 52 ms 6140 KB Correct
25 Correct 56 ms 6124 KB Correct
26 Correct 84 ms 8000 KB Correct
27 Correct 81 ms 8000 KB Correct
28 Correct 75 ms 8000 KB Correct
29 Correct 83 ms 7844 KB Correct
30 Correct 86 ms 8168 KB Correct
31 Correct 92 ms 7864 KB Correct
32 Correct 81 ms 7996 KB Correct
33 Correct 77 ms 7948 KB Correct
34 Correct 80 ms 7996 KB Correct
35 Correct 80 ms 8000 KB Correct
36 Correct 73 ms 8176 KB Correct
37 Correct 92 ms 7996 KB Correct
38 Correct 78 ms 7844 KB Correct
39 Correct 84 ms 7996 KB Correct
40 Correct 90 ms 8084 KB Correct
41 Correct 78 ms 7996 KB Correct
42 Correct 72 ms 7920 KB Correct
43 Correct 78 ms 7996 KB Correct
44 Correct 79 ms 8004 KB Correct
45 Correct 80 ms 7996 KB Correct
46 Correct 81 ms 8152 KB Correct
47 Correct 83 ms 8352 KB Correct
48 Correct 78 ms 7936 KB Correct
49 Correct 81 ms 7996 KB Correct
50 Correct 82 ms 8116 KB Correct
51 Correct 81 ms 8016 KB Correct
52 Correct 82 ms 8000 KB Correct
53 Correct 87 ms 7932 KB Correct
54 Correct 83 ms 8180 KB Correct
55 Correct 78 ms 7996 KB Correct
56 Correct 78 ms 8512 KB Correct
57 Correct 83 ms 8364 KB Correct
58 Correct 79 ms 8508 KB Correct
59 Correct 82 ms 8380 KB Correct
60 Correct 79 ms 8180 KB Correct
61 Correct 84 ms 8180 KB Correct
62 Correct 72 ms 8408 KB Correct
63 Correct 88 ms 8424 KB Correct
64 Correct 80 ms 8264 KB Correct
65 Correct 80 ms 8012 KB Correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 768 KB Correct
2 Correct 199 ms 13400 KB Correct
3 Correct 206 ms 13752 KB Correct
4 Correct 103 ms 14576 KB Correct
5 Correct 106 ms 15580 KB Correct
6 Correct 196 ms 15268 KB Correct
7 Correct 93 ms 15356 KB Correct
8 Correct 79 ms 13740 KB Correct
9 Correct 220 ms 14072 KB Correct
10 Correct 221 ms 14908 KB Correct
11 Correct 154 ms 13884 KB Correct
12 Correct 102 ms 15532 KB Correct
13 Correct 239 ms 13820 KB Correct
14 Correct 84 ms 13116 KB Correct
15 Correct 78 ms 13636 KB Correct
16 Correct 206 ms 14796 KB Correct
17 Correct 213 ms 16188 KB Correct
18 Correct 129 ms 12692 KB Correct
19 Correct 99 ms 13796 KB Correct
20 Correct 168 ms 13060 KB Correct
21 Correct 84 ms 15104 KB Correct
22 Correct 82 ms 13884 KB Correct
23 Correct 213 ms 13964 KB Correct
24 Correct 214 ms 14184 KB Correct
25 Correct 115 ms 13616 KB Correct
26 Correct 102 ms 14760 KB Correct
27 Correct 97 ms 13288 KB Correct
28 Correct 88 ms 13892 KB Correct
29 Correct 84 ms 14368 KB Correct
30 Correct 238 ms 14448 KB Correct
31 Correct 235 ms 13072 KB Correct
32 Correct 93 ms 15420 KB Correct
33 Correct 249 ms 14376 KB Correct
34 Correct 249 ms 14800 KB Correct
35 Correct 88 ms 13300 KB Correct
36 Correct 94 ms 12684 KB Correct
37 Correct 214 ms 14160 KB Correct
38 Correct 222 ms 14464 KB Correct
39 Correct 270 ms 15364 KB Correct
40 Correct 147 ms 15520 KB Correct
41 Correct 210 ms 15032 KB Correct
42 Correct 87 ms 14584 KB Correct
43 Correct 86 ms 14444 KB Correct
44 Correct 225 ms 14396 KB Correct
45 Correct 207 ms 12792 KB Correct
46 Correct 90 ms 13248 KB Correct
47 Correct 93 ms 13828 KB Correct
48 Correct 102 ms 14836 KB Correct
49 Correct 87 ms 13036 KB Correct
50 Correct 86 ms 15164 KB Correct
51 Correct 77 ms 7944 KB Correct
52 Correct 82 ms 7932 KB Correct
53 Correct 81 ms 8132 KB Correct
54 Correct 92 ms 11968 KB Correct
55 Correct 141 ms 12280 KB Correct
56 Correct 158 ms 12284 KB Correct
57 Correct 76 ms 7924 KB Correct
58 Correct 89 ms 7932 KB Correct
59 Correct 82 ms 7940 KB Correct
60 Correct 77 ms 7924 KB Correct
61 Correct 79 ms 7996 KB Correct
62 Correct 78 ms 8128 KB Correct
63 Correct 79 ms 8032 KB Correct
64 Correct 60 ms 6116 KB Correct
65 Correct 61 ms 6140 KB Correct
66 Correct 86 ms 7932 KB Correct
67 Correct 80 ms 8024 KB Correct
68 Correct 73 ms 7940 KB Correct
69 Correct 86 ms 8028 KB Correct
70 Correct 54 ms 6044 KB Correct
71 Correct 60 ms 5884 KB Correct
72 Correct 56 ms 6272 KB Correct
73 Correct 59 ms 6136 KB Correct
74 Correct 52 ms 6140 KB Correct
75 Correct 56 ms 6124 KB Correct
76 Correct 84 ms 8000 KB Correct
77 Correct 81 ms 8000 KB Correct
78 Correct 75 ms 8000 KB Correct
79 Correct 83 ms 7844 KB Correct
80 Correct 86 ms 8168 KB Correct
81 Correct 92 ms 7864 KB Correct
82 Correct 81 ms 7996 KB Correct
83 Correct 77 ms 7948 KB Correct
84 Correct 80 ms 7996 KB Correct
85 Correct 80 ms 8000 KB Correct
86 Correct 73 ms 8176 KB Correct
87 Correct 92 ms 7996 KB Correct
88 Correct 78 ms 7844 KB Correct
89 Correct 84 ms 7996 KB Correct
90 Correct 90 ms 8084 KB Correct
91 Correct 78 ms 7996 KB Correct
92 Correct 72 ms 7920 KB Correct
93 Correct 78 ms 7996 KB Correct
94 Correct 79 ms 8004 KB Correct
95 Correct 80 ms 7996 KB Correct
96 Correct 81 ms 8152 KB Correct
97 Correct 83 ms 8352 KB Correct
98 Correct 78 ms 7936 KB Correct
99 Correct 81 ms 7996 KB Correct
100 Correct 82 ms 8116 KB Correct
101 Correct 81 ms 8016 KB Correct
102 Correct 82 ms 8000 KB Correct
103 Correct 87 ms 7932 KB Correct
104 Correct 83 ms 8180 KB Correct
105 Correct 78 ms 7996 KB Correct
106 Correct 78 ms 8512 KB Correct
107 Correct 83 ms 8364 KB Correct
108 Correct 79 ms 8508 KB Correct
109 Correct 82 ms 8380 KB Correct
110 Correct 79 ms 8180 KB Correct
111 Correct 84 ms 8180 KB Correct
112 Correct 72 ms 8408 KB Correct
113 Correct 88 ms 8424 KB Correct
114 Correct 80 ms 8264 KB Correct
115 Correct 80 ms 8012 KB Correct
116 Correct 89 ms 8196 KB Correct
117 Correct 86 ms 8192 KB Correct
118 Correct 81 ms 8252 KB Correct
119 Correct 83 ms 8052 KB Correct
120 Correct 80 ms 7936 KB Correct
121 Correct 83 ms 8172 KB Correct
122 Correct 84 ms 8180 KB Correct
123 Correct 88 ms 12552 KB Correct
124 Correct 160 ms 12216 KB Correct
125 Correct 155 ms 12300 KB Correct
126 Correct 80 ms 7740 KB Correct
127 Correct 77 ms 7936 KB Correct
128 Correct 90 ms 7928 KB Correct
129 Correct 82 ms 8040 KB Correct
130 Correct 82 ms 7920 KB Correct
131 Correct 86 ms 7828 KB Correct
132 Correct 83 ms 7932 KB Correct
133 Correct 60 ms 6040 KB Correct
134 Correct 62 ms 6128 KB Correct
135 Correct 78 ms 7844 KB Correct
136 Correct 78 ms 7928 KB Correct
137 Correct 76 ms 8000 KB Correct
138 Correct 79 ms 7924 KB Correct
139 Correct 62 ms 6152 KB Correct
140 Correct 56 ms 5892 KB Correct
141 Correct 60 ms 6128 KB Correct
142 Correct 54 ms 6304 KB Correct
143 Correct 55 ms 6228 KB Correct
144 Correct 62 ms 6144 KB Correct
145 Correct 86 ms 8056 KB Correct
146 Correct 78 ms 7932 KB Correct
147 Correct 77 ms 7932 KB Correct
148 Correct 78 ms 7940 KB Correct
149 Correct 86 ms 7840 KB Correct
150 Correct 81 ms 7996 KB Correct
151 Correct 80 ms 7864 KB Correct
152 Correct 72 ms 7912 KB Correct
153 Correct 83 ms 7924 KB Correct
154 Correct 80 ms 7996 KB Correct
155 Correct 81 ms 7912 KB Correct
156 Correct 77 ms 7772 KB Correct
157 Correct 72 ms 7944 KB Correct
158 Correct 75 ms 7916 KB Correct
159 Correct 88 ms 8220 KB Correct
160 Correct 79 ms 7932 KB Correct
161 Correct 86 ms 8084 KB Correct
162 Correct 79 ms 7932 KB Correct
163 Correct 80 ms 7996 KB Correct
164 Correct 69 ms 7928 KB Correct
165 Correct 80 ms 7940 KB Correct
166 Correct 94 ms 8196 KB Correct
167 Correct 78 ms 7936 KB Correct
168 Correct 79 ms 8004 KB Correct
169 Correct 88 ms 8076 KB Correct
170 Correct 80 ms 7996 KB Correct
171 Correct 80 ms 7896 KB Correct
172 Correct 86 ms 7928 KB Correct
173 Correct 86 ms 8364 KB Correct
174 Correct 82 ms 8004 KB Correct
175 Correct 76 ms 8364 KB Correct
176 Correct 74 ms 8312 KB Correct
177 Correct 83 ms 8432 KB Correct
178 Correct 93 ms 8428 KB Correct
179 Correct 79 ms 8004 KB Correct
180 Correct 78 ms 8260 KB Correct
181 Correct 77 ms 8448 KB Correct
182 Correct 93 ms 8564 KB Correct
183 Correct 82 ms 8008 KB Correct
184 Correct 80 ms 8168 KB Correct
185 Correct 214 ms 13404 KB Correct
186 Correct 198 ms 13840 KB Correct
187 Correct 120 ms 14784 KB Correct
188 Correct 111 ms 15348 KB Correct
189 Correct 222 ms 15260 KB Correct
190 Correct 78 ms 15676 KB Correct
191 Correct 89 ms 13628 KB Correct
192 Correct 195 ms 13996 KB Correct
193 Correct 198 ms 14720 KB Correct
194 Correct 150 ms 13996 KB Correct
195 Correct 119 ms 15584 KB Correct
196 Correct 286 ms 14064 KB Correct
197 Correct 86 ms 13044 KB Correct
198 Correct 91 ms 13560 KB Correct
199 Correct 216 ms 14724 KB Correct
200 Correct 216 ms 16188 KB Correct
201 Correct 125 ms 12784 KB Correct
202 Correct 95 ms 13548 KB Correct
203 Correct 152 ms 13012 KB Correct
204 Correct 86 ms 15088 KB Correct
205 Correct 84 ms 13892 KB Correct
206 Correct 222 ms 14140 KB Correct
207 Correct 201 ms 14256 KB Correct
208 Correct 98 ms 13772 KB Correct
209 Correct 99 ms 14768 KB Correct
210 Correct 94 ms 13216 KB Correct
211 Correct 87 ms 13700 KB Correct
212 Correct 89 ms 14144 KB Correct
213 Correct 206 ms 14448 KB Correct
214 Correct 214 ms 12860 KB Correct
215 Correct 96 ms 15356 KB Correct
216 Correct 260 ms 14376 KB Correct
217 Correct 227 ms 14804 KB Correct
218 Correct 83 ms 13312 KB Correct
219 Correct 83 ms 12992 KB Correct
220 Correct 197 ms 14336 KB Correct
221 Correct 207 ms 14572 KB Correct
222 Correct 235 ms 15248 KB Correct
223 Correct 159 ms 15588 KB Correct
224 Correct 220 ms 15072 KB Correct
225 Correct 86 ms 14652 KB Correct
226 Correct 86 ms 14368 KB Correct
227 Correct 222 ms 14604 KB Correct
228 Correct 209 ms 12604 KB Correct
229 Correct 87 ms 13304 KB Correct
230 Correct 93 ms 13904 KB Correct
231 Correct 107 ms 14572 KB Correct
232 Correct 71 ms 12976 KB Correct
233 Correct 91 ms 15180 KB Correct
234 Correct 96 ms 10996 KB Correct
235 Correct 100 ms 11332 KB Correct
236 Correct 60 ms 6144 KB Correct
237 Correct 59 ms 6136 KB Correct
238 Correct 57 ms 5888 KB Correct
239 Correct 44 ms 4836 KB Correct
240 Incorrect 83 ms 8116 KB Not correct
241 Halted 0 ms 0 KB -