oj.uz

Submission #556762

# Submission time Handle Problem Language Result Execution time Memory
556762 2022-05-03T22:01:10 Z MilosMilutinovic Inside information (BOI21_servers) C++14
52.5 / 100
 354 ms 45700 KB 
#include <bits/stdc++.h>

using namespace std;

class dsu {
  public:
  vector<int> p;
  vector<int> sz;
  int n;

  dsu(int _n) : n(_n) {
    p.resize(n);
    sz.resize(n);
    for (int i = 0; i < n; i++) {
      p[i] = i;
      sz[i] = 1;
    }
  }

  inline int get(int x) {
    return (x == p[x] ? x : (p[x] = get(p[x])));
  }

  inline bool unite(int x, int y) {
    x = get(x);
    y = get(y);
    if (x != y) {
      if (sz[x] > sz[y]) {
        swap(x, y);
      }
      p[x] = y;
      sz[y] += sz[x];
      return true;
    }
    return false;
  }
};

int main() {
//  freopen("in.txt", "r", stdin);
//  freopen("out.txt", "w", stdout);
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  vector<vector<pair<int, int>>> g(n);
  int q = n - 1 + k;
  vector<char> foo(q);
  vector<int> x(q);
  vector<int> y(q);
  for (int i = 0; i < q; i++) {
    cin >> foo[i] >> x[i];
    if (foo[i] != 'C') {
      cin >> y[i];
    }
    --x[i], --y[i];
    if (foo[i] == 'S') {
      g[x[i]].emplace_back(y[i], i);
      g[y[i]].emplace_back(x[i], i);
    }
  }
  vector<int> par(n);
  vector<int> wei(n);
  vector<int> dep(n);
  function<void(int, int)> Dfs = [&](int u, int pr) {
    dep[u] = dep[pr] + 1;
    for (auto& e : g[u]) {
      int v = e.first;
      int w = e.second;
      if (v == pr) {
        continue;
      }
      par[v] = u;
      wei[v] = w;
      Dfs(v, u);
    }
  };
  Dfs(0, 0);
  wei[0] = 1000000;
  const int L = 20;
  vector<vector<int>> up(n, vector<int>(L));
  for (int i = 0; i < n; i++) {
    up[i][0] = par[i];
  }
  for (int j = 1; j < L; j++) {
    for (int i = 0; i < n; i++) {
      up[i][j] = up[up[i][j - 1]][j - 1];
    }
  }
  auto Lca = [&](int u, int v) {
    if (dep[u] < dep[v]) {
      swap(u, v);
    }
    for (int i = L - 1; i >= 0; i--) {
      if (dep[up[u][i]] >= dep[v]) {
        u = up[u][i];
      }
    }
    if (u == v) {
      return u;
    }
    for (int i = L - 1; i >= 0; i--) {
      if (up[u][i] != up[v][i]) {
        u = up[u][i];
        v = up[v][i];
      }
    }
    return up[u][0];
  };
  auto Lift = [&](int x, int d) {
    for (int i = L - 1; i >= 0; i--) {
      if (d >> i & 1) {
        x = up[x][i];
      }
    }
    return x;
  };
  vector<vector<int>> go(n, vector<int>(2, 0));
  vector<int> order(n);
  iota(order.begin(), order.end(), 0);
  sort(order.begin(), order.end(), [&](int i, int j) {
    return dep[i] < dep[j];
  });
  for (int id = 1; id < n; id++) {
    int i = order[id];
    if (wei[par[i]] > wei[i]) {
      go[i][0] = go[par[i]][0];
      go[i][1] = par[i];
    } else {
      go[i][0] = par[i];
      go[i][1] = go[par[i]][1];
    }
  }
  vector<int> qans(q);
  for (int i = 0; i < q; i++) {
    if (foo[i] != 'Q') {
      continue;
    }
    if (x[i] == y[i]) {
      qans[i] = 1;
      continue;
    }
    int z = Lca(x[i], y[i]);
    bool ok = true;
    if (x[i] != z && y[i] != z) {
      int p_x = Lift(x[i], dep[x[i]] - dep[z] - 1);
      int p_y = Lift(y[i], dep[y[i]] - dep[z] - 1);
      if (wei[p_y] > wei[p_x]) {
        ok = false;
      }
    }
    if (x[i] != z && wei[x[i]] > i) {
      ok = false;
    }
    if (y[i] != z && wei[Lift(y[i], dep[y[i]] - dep[z] - 1)] > i) {
      ok = false;
    }
    if (dep[go[y[i]][0]] <= dep[z] && dep[go[x[i]][1]] <= dep[z] && ok) {
      qans[i] = 1;
    } else {
      qans[i] = 0;
    }
  }
  vector<int> ans(n, 1);
  vector<pair<int, int>> edges;
  if (n <= 4000) {
    for (int i = 0; i < q; i++) {
      if (foo[i] == 'S') {
        edges.emplace_back(x[i], y[i]);
        dsu d(n);
        vector<int> nans(n, 1);
        for (int j = edges.size() - 1; j >= 0; j--) {
          int u = edges[j].first;
          int v = edges[j].second;
          int xv = nans[v];
          int xu = nans[u];
          nans[u] += xv;
          nans[v] += xu;
          assert(d.unite(u, v));
        }
        swap(ans, nans);
      }
      if (foo[i] == 'C') {
        qans[i] = ans[x[i]];
      }
    }
  }
  for (int i = 0; i < q; i++) {
    if (foo[i] == 'Q') {
      cout << (qans[i] == 0 ? "no" : "yes") << '\n';
    } else if (foo[i] == 'C') {
      cout << qans[i] <<  '\n';
    }
  }
  return 0;
}

Subtask #1
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 59 ms 2380 KB Output is correct
2 Correct 228 ms 3592 KB Output is correct
3 Correct 212 ms 3816 KB Output is correct
4 Correct 236 ms 3744 KB Output is correct
5 Correct 191 ms 3832 KB Output is correct
6 Correct 213 ms 3804 KB Output is correct

Subtask #2
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 59 ms 2380 KB Output is correct
2 Correct 228 ms 3592 KB Output is correct
3 Correct 212 ms 3816 KB Output is correct
4 Correct 236 ms 3744 KB Output is correct
5 Correct 191 ms 3832 KB Output is correct
6 Correct 213 ms 3804 KB Output is correct
7 Correct 53 ms 2492 KB Output is correct
8 Correct 194 ms 4384 KB Output is correct
9 Correct 203 ms 4556 KB Output is correct
10 Correct 203 ms 4480 KB Output is correct
11 Correct 172 ms 4640 KB Output is correct
12 Correct 194 ms 4516 KB Output is correct

Subtask #3
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 64 ms 2512 KB Output is correct
2 Correct 168 ms 34572 KB Output is correct
3 Correct 214 ms 34428 KB Output is correct

Subtask #4
0 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 64 ms 2512 KB Output is correct
2 Correct 168 ms 34572 KB Output is correct
3 Correct 214 ms 34428 KB Output is correct
4 Correct 49 ms 2352 KB Output is correct
5 Incorrect 157 ms 34508 KB Extra information in the output file
6 Halted 0 ms 0 KB -

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 2368 KB Output is correct
2 Correct 188 ms 43092 KB Output is correct
3 Correct 187 ms 43084 KB Output is correct
4 Correct 211 ms 42988 KB Output is correct

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 2368 KB Output is correct
2 Correct 188 ms 43092 KB Output is correct
3 Correct 187 ms 43084 KB Output is correct
4 Correct 211 ms 42988 KB Output is correct
5 Correct 48 ms 2276 KB Output is correct
6 Incorrect 156 ms 45700 KB Extra information in the output file
7 Halted 0 ms 0 KB -

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 2476 KB Output is correct
2 Correct 232 ms 34608 KB Output is correct
3 Correct 173 ms 34600 KB Output is correct

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 2476 KB Output is correct
2 Correct 232 ms 34608 KB Output is correct
3 Correct 173 ms 34600 KB Output is correct
4 Correct 57 ms 2272 KB Output is correct
5 Incorrect 144 ms 37132 KB Extra information in the output file
6 Halted 0 ms 0 KB -

Subtask #9
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 43 ms 2360 KB Output is correct
2 Correct 185 ms 43080 KB Output is correct
3 Correct 165 ms 42928 KB Output is correct
4 Correct 209 ms 42952 KB Output is correct
5 Correct 53 ms 2272 KB Output is correct
6 Correct 193 ms 34436 KB Output is correct
7 Correct 169 ms 34564 KB Output is correct
8 Correct 273 ms 35260 KB Output is correct
9 Correct 220 ms 35332 KB Output is correct
10 Correct 262 ms 38020 KB Output is correct
11 Correct 339 ms 37316 KB Output is correct

Subtask #10
0 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 43 ms 2360 KB Output is correct
2 Correct 185 ms 43080 KB Output is correct
3 Correct 165 ms 42928 KB Output is correct
4 Correct 209 ms 42952 KB Output is correct
5 Correct 53 ms 2272 KB Output is correct
6 Correct 193 ms 34436 KB Output is correct
7 Correct 169 ms 34564 KB Output is correct
8 Correct 273 ms 35260 KB Output is correct
9 Correct 220 ms 35332 KB Output is correct
10 Correct 262 ms 38020 KB Output is correct
11 Correct 339 ms 37316 KB Output is correct
12 Correct 43 ms 2272 KB Output is correct
13 Incorrect 142 ms 45592 KB Extra information in the output file
14 Halted 0 ms 0 KB -

Subtask #11
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 50 ms 2368 KB Output is correct
2 Correct 240 ms 3568 KB Output is correct
3 Correct 209 ms 3704 KB Output is correct
4 Correct 236 ms 3672 KB Output is correct
5 Correct 193 ms 4040 KB Output is correct
6 Correct 208 ms 3776 KB Output is correct
7 Correct 54 ms 2476 KB Output is correct
8 Correct 181 ms 34572 KB Output is correct
9 Correct 185 ms 34420 KB Output is correct
10 Correct 48 ms 2244 KB Output is correct
11 Correct 174 ms 43020 KB Output is correct
12 Correct 181 ms 43020 KB Output is correct
13 Correct 232 ms 42956 KB Output is correct
14 Correct 51 ms 2248 KB Output is correct
15 Correct 201 ms 34428 KB Output is correct
16 Correct 170 ms 34532 KB Output is correct
17 Correct 259 ms 35236 KB Output is correct
18 Correct 217 ms 35356 KB Output is correct
19 Correct 263 ms 37964 KB Output is correct
20 Correct 354 ms 37260 KB Output is correct
21 Correct 192 ms 34492 KB Output is correct
22 Correct 218 ms 34440 KB Output is correct
23 Correct 203 ms 34960 KB Output is correct
24 Correct 239 ms 34996 KB Output is correct
25 Correct 236 ms 36632 KB Output is correct
26 Correct 175 ms 34352 KB Output is correct
27 Correct 161 ms 34320 KB Output is correct

Subtask #12
0 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 50 ms 2368 KB Output is correct
2 Correct 240 ms 3568 KB Output is correct
3 Correct 209 ms 3704 KB Output is correct
4 Correct 236 ms 3672 KB Output is correct
5 Correct 193 ms 4040 KB Output is correct
6 Correct 208 ms 3776 KB Output is correct
7 Correct 54 ms 2476 KB Output is correct
8 Correct 181 ms 34572 KB Output is correct
9 Correct 185 ms 34420 KB Output is correct
10 Correct 48 ms 2244 KB Output is correct
11 Correct 174 ms 43020 KB Output is correct
12 Correct 181 ms 43020 KB Output is correct
13 Correct 232 ms 42956 KB Output is correct
14 Correct 51 ms 2248 KB Output is correct
15 Correct 201 ms 34428 KB Output is correct
16 Correct 170 ms 34532 KB Output is correct
17 Correct 259 ms 35236 KB Output is correct
18 Correct 217 ms 35356 KB Output is correct
19 Correct 263 ms 37964 KB Output is correct
20 Correct 354 ms 37260 KB Output is correct
21 Correct 192 ms 34492 KB Output is correct
22 Correct 218 ms 34440 KB Output is correct
23 Correct 203 ms 34960 KB Output is correct
24 Correct 239 ms 34996 KB Output is correct
25 Correct 236 ms 36632 KB Output is correct
26 Correct 175 ms 34352 KB Output is correct
27 Correct 161 ms 34320 KB Output is correct
28 Correct 55 ms 2308 KB Output is correct
29 Correct 209 ms 4396 KB Output is correct
30 Correct 188 ms 4516 KB Output is correct
31 Correct 218 ms 4444 KB Output is correct
32 Correct 172 ms 4680 KB Output is correct
33 Correct 201 ms 4508 KB Output is correct
34 Correct 59 ms 3008 KB Output is correct
35 Incorrect 174 ms 36928 KB Extra information in the output file
36 Halted 0 ms 0 KB -