oj.uz

Submission #706269

# Submission time Handle Problem Language Result Execution time Memory
706269 2023-03-06T08:31:37 Z Soumya1 Simurgh (IOI17_simurgh) C++17
100 / 100
 290 ms 5652 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
#ifdef __LOCAL__
  #include <debug_local.h>
#endif
using namespace std;
const int mxN = 505;
int n, m;
int ad[mxN][mxN];
vector<int> g[mxN];
int cnt;
vector<pair<int, int>> edges;
struct DSU {
  int n;
  vector<int> par;
  DSU(int _n) {
    n = _n;
    par.resize(n);
    iota(par.begin(), par.end(), 0);
  }
  int find(int u) {
    return par[u] = (u == par[u] ? u : find(par[u]));
  }
  bool unite(int u, int v) {
    u = find(u), v = find(v);
    if (u == v) return false;
    par[u] = v;
    return true;
  }
};
int query(vector<int> r) {
  cnt++;
  return count_common_roads(r);
}
set<int> tree;
set<int> on;
int Myquery(vector<int> v) {
  vector<int> r;
  DSU dsu(n);
  for (int i : v) {
    auto [u, v] = edges[i];
    r.push_back(i);
    dsu.unite(u, v);
  }
  for (int i : on) {
    auto [u, v] = edges[i];
    if (dsu.unite(u, v)) r.push_back(i);  
  }
  for (int i : tree) {
    auto [u, v] = edges[i];
    if (dsu.unite(u, v)) r.push_back(i);
  }
  return query(r);
}
int init;
int reduction(vector<int> v) {
  vector<int> r;
  DSU dsu(n);
  for (int i : v) {
    auto [u, v] = edges[i];
    r.push_back(i);
    dsu.unite(u, v);
  }
  int ans = 0;
  for (int i : on) {
    auto [u, v] = edges[i];
    if (dsu.unite(u, v)) r.push_back(i);  
    else ans++;
  }
  for (int i : tree) {
    auto [u, v] = edges[i];
    if (dsu.unite(u, v)) r.push_back(i);
  }
  return ans;
}
bool vis[mxN];
int in[mxN], out[mxN], par[mxN], timer;
void find_tree(int u) {
  in[u] = ++timer;
  vis[u] = true;
  for (int v = 0; v < n; v++) {
    if (ad[u][v] != -1 && !vis[v]) {
      g[u].push_back(v);
      tree.insert(ad[u][v]);
      par[v] = u;
      find_tree(v);
    } 
  }
  out[u] = timer;
}
bool done[mxN * mxN];
vector<int> Q;
set<int> new_on;
void solve(int l, int r, int tot) {
  if (l > r || !tot) return;
  if (l == r) {
    new_on.insert(Q[l]);
    return;
  }
  int m = (l + r) >> 1;
  int val = Myquery(vector<int> (Q.begin() + l, Q.begin() + m + 1));
  int red = reduction(vector<int> (Q.begin() + l, Q.begin() + m + 1));
  solve(l, m, val + red - init);
  solve(m + 1, r, tot - (val + red - init));
}
void solve_u(int u) {
  vector<int> cur;
  for (int i = 0; i < n; i++) {
    if (ad[u][i] != -1 && !done[ad[u][i]]) cur.push_back(ad[u][i]); 
  }
  Q = cur;
  solve(0, Q.size() - 1, Myquery(Q) + reduction(Q) - init);
  for (int i : Q) done[i] = true;
}
bool insubtree(int u, int v) {
  return (in[u] <= in[v] && out[v] <= out[u]);
}
void get(int u, int v, int a, int b) {
  vector<int> path = {ad[a][b]};
  int aa = a;
  while (aa != b) {
    path.push_back(ad[aa][par[aa]]);
    aa = par[aa];
  }
  int val = -1;
  for (int i : path) {
    if (done[i]) {
      set<int> ntree = tree;
      ntree.erase(i);
      ntree.insert(ad[a][b]);
      int v = query(vector<int> (ntree.begin(), ntree.end()));
      if (v == init) val = on.count(i);
      else val = on.count(i) ^ 1;
      break;
    }
  }
  vector<int> store(path.size(), -1);
  if (val == -1) {
    int mx = init;
    set<int> ntree = tree;
    ntree.insert(ad[a][b]);
    int idx = 1;
    for (int i : path) {
      if (i == ad[a][b]) continue;
      ntree.erase(i);
      mx = max(mx, store[idx] = query(vector<int> (ntree.begin(), ntree.end())));
      ntree.insert(i);
      idx++;
    }
    if (mx > init) val = 1;
    else val = 0;
  }
  if (val == 1) new_on.insert(ad[a][b]);
  for (int i = 1; i < path.size(); i++) {
    if (done[path[i]]) continue;
    auto ntree = tree;
    ntree.insert(ad[a][b]);
    ntree.erase(path[i]);
    int q = (store[i] == -1 ? query(vector<int> (ntree.begin(), ntree.end())) : store[i]);
    if (val == 1) {
      if (q == init) on.insert(path[i]);
    } else {
      if (q < init) on.insert(path[i]);
    }
  }
  for (int i : path) done[i] = true;
}
void find_tree_edges() {
  find_tree(0);
  init = query(vector<int> (tree.begin(), tree.end()));
  for (int u = 0; u < n; u++) {
    for (int v : g[u]) {
      if (done[ad[u][v]]) continue;
      for (int i = 0; i < m; i++) {
        auto [a, b] = edges[i];
        if (i == ad[u][v]) continue;
        if (insubtree(v, a) && !insubtree(v, b)) {
          get(u, v, a, b);
          break;
        }
        if (insubtree(v, b) && !insubtree(v, a)) {
          get(u, v, b, a);
          break;
        }
      }
      if (!done[ad[u][v]]) {
        done[ad[u][v]] = true;
        on.insert(ad[u][v]);
      }
    }
  }
}
vector<int> find_roads(int N, vector<int> U, vector<int> V) {
  memset(par, -1, sizeof par);
  if (N == 2) {
    return {0};
  }
  memset(ad, -1, sizeof ad);
  n = N, m = U.size();
  for (int i = 0; i < m; i++) {
    ad[U[i]][V[i]] = ad[V[i]][U[i]] = i;
    edges.push_back({U[i], V[i]});
  }
  find_tree_edges();
  for (int u = 0; u < n; u++) {
    solve_u(u);
  }
  for (int i : new_on) on.insert(i);
  return vector<int> (on.begin(), on.end());
}

Compilation message

simurgh.cpp: In function 'void get(int, int, int, int)':
simurgh.cpp:154:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  154 |   for (int i = 1; i < path.size(); i++) {
      |                   ~~^~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1236 KB correct
2 Correct 1 ms 1236 KB correct
3 Correct 1 ms 1236 KB correct
4 Correct 1 ms 1200 KB correct
5 Correct 1 ms 1236 KB correct
6 Correct 1 ms 1236 KB correct
7 Correct 1 ms 212 KB correct
8 Correct 1 ms 1236 KB correct
9 Correct 1 ms 1236 KB correct
10 Correct 1 ms 1236 KB correct
11 Correct 1 ms 1236 KB correct
12 Correct 1 ms 1236 KB correct
13 Correct 1 ms 1236 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1236 KB correct
2 Correct 1 ms 1236 KB correct
3 Correct 1 ms 1236 KB correct
4 Correct 1 ms 1200 KB correct
5 Correct 1 ms 1236 KB correct
6 Correct 1 ms 1236 KB correct
7 Correct 1 ms 212 KB correct
8 Correct 1 ms 1236 KB correct
9 Correct 1 ms 1236 KB correct
10 Correct 1 ms 1236 KB correct
11 Correct 1 ms 1236 KB correct
12 Correct 1 ms 1236 KB correct
13 Correct 1 ms 1236 KB correct
14 Correct 3 ms 1364 KB correct
15 Correct 2 ms 1364 KB correct
16 Correct 2 ms 1364 KB correct
17 Correct 3 ms 1236 KB correct
18 Correct 3 ms 1236 KB correct
19 Correct 3 ms 1364 KB correct
20 Correct 3 ms 1236 KB correct
21 Correct 3 ms 1236 KB correct
22 Correct 2 ms 1236 KB correct
23 Correct 3 ms 1236 KB correct
24 Correct 2 ms 1236 KB correct
25 Correct 1 ms 1236 KB correct
26 Correct 2 ms 1236 KB correct
27 Correct 3 ms 1236 KB correct
28 Correct 1 ms 1236 KB correct
29 Correct 2 ms 1236 KB correct
30 Correct 2 ms 1236 KB correct
31 Correct 2 ms 1236 KB correct
32 Correct 2 ms 1236 KB correct
33 Correct 3 ms 1236 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1236 KB correct
2 Correct 1 ms 1236 KB correct
3 Correct 1 ms 1236 KB correct
4 Correct 1 ms 1200 KB correct
5 Correct 1 ms 1236 KB correct
6 Correct 1 ms 1236 KB correct
7 Correct 1 ms 212 KB correct
8 Correct 1 ms 1236 KB correct
9 Correct 1 ms 1236 KB correct
10 Correct 1 ms 1236 KB correct
11 Correct 1 ms 1236 KB correct
12 Correct 1 ms 1236 KB correct
13 Correct 1 ms 1236 KB correct
14 Correct 3 ms 1364 KB correct
15 Correct 2 ms 1364 KB correct
16 Correct 2 ms 1364 KB correct
17 Correct 3 ms 1236 KB correct
18 Correct 3 ms 1236 KB correct
19 Correct 3 ms 1364 KB correct
20 Correct 3 ms 1236 KB correct
21 Correct 3 ms 1236 KB correct
22 Correct 2 ms 1236 KB correct
23 Correct 3 ms 1236 KB correct
24 Correct 2 ms 1236 KB correct
25 Correct 1 ms 1236 KB correct
26 Correct 2 ms 1236 KB correct
27 Correct 3 ms 1236 KB correct
28 Correct 1 ms 1236 KB correct
29 Correct 2 ms 1236 KB correct
30 Correct 2 ms 1236 KB correct
31 Correct 2 ms 1236 KB correct
32 Correct 2 ms 1236 KB correct
33 Correct 3 ms 1236 KB correct
34 Correct 60 ms 2080 KB correct
35 Correct 52 ms 2132 KB correct
36 Correct 48 ms 2004 KB correct
37 Correct 18 ms 1416 KB correct
38 Correct 52 ms 2124 KB correct
39 Correct 44 ms 2004 KB correct
40 Correct 45 ms 2004 KB correct
41 Correct 55 ms 2132 KB correct
42 Correct 57 ms 2132 KB correct
43 Correct 41 ms 1848 KB correct
44 Correct 36 ms 1772 KB correct
45 Correct 46 ms 1748 KB correct
46 Correct 38 ms 1648 KB correct
47 Correct 28 ms 1512 KB correct
48 Correct 12 ms 1364 KB correct
49 Correct 17 ms 1412 KB correct
50 Correct 27 ms 1492 KB correct
51 Correct 41 ms 1748 KB correct
52 Correct 37 ms 1768 KB correct
53 Correct 35 ms 1628 KB correct
54 Correct 41 ms 1836 KB correct
55 Correct 43 ms 1748 KB correct
56 Correct 47 ms 1748 KB correct
57 Correct 44 ms 1748 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 232 KB correct
2 Correct 1 ms 1236 KB correct
3 Correct 159 ms 3616 KB correct
4 Correct 254 ms 4564 KB correct
5 Correct 290 ms 4568 KB correct
6 Correct 242 ms 4616 KB correct
7 Correct 166 ms 4564 KB correct
8 Correct 181 ms 4564 KB correct
9 Correct 249 ms 4564 KB correct
10 Correct 275 ms 4568 KB correct
11 Correct 285 ms 4580 KB correct
12 Correct 263 ms 4672 KB correct
13 Correct 1 ms 1236 KB correct
14 Correct 249 ms 4568 KB correct
15 Correct 253 ms 4568 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1236 KB correct
2 Correct 1 ms 1236 KB correct
3 Correct 1 ms 1236 KB correct
4 Correct 1 ms 1200 KB correct
5 Correct 1 ms 1236 KB correct
6 Correct 1 ms 1236 KB correct
7 Correct 1 ms 212 KB correct
8 Correct 1 ms 1236 KB correct
9 Correct 1 ms 1236 KB correct
10 Correct 1 ms 1236 KB correct
11 Correct 1 ms 1236 KB correct
12 Correct 1 ms 1236 KB correct
13 Correct 1 ms 1236 KB correct
14 Correct 3 ms 1364 KB correct
15 Correct 2 ms 1364 KB correct
16 Correct 2 ms 1364 KB correct
17 Correct 3 ms 1236 KB correct
18 Correct 3 ms 1236 KB correct
19 Correct 3 ms 1364 KB correct
20 Correct 3 ms 1236 KB correct
21 Correct 3 ms 1236 KB correct
22 Correct 2 ms 1236 KB correct
23 Correct 3 ms 1236 KB correct
24 Correct 2 ms 1236 KB correct
25 Correct 1 ms 1236 KB correct
26 Correct 2 ms 1236 KB correct
27 Correct 3 ms 1236 KB correct
28 Correct 1 ms 1236 KB correct
29 Correct 2 ms 1236 KB correct
30 Correct 2 ms 1236 KB correct
31 Correct 2 ms 1236 KB correct
32 Correct 2 ms 1236 KB correct
33 Correct 3 ms 1236 KB correct
34 Correct 60 ms 2080 KB correct
35 Correct 52 ms 2132 KB correct
36 Correct 48 ms 2004 KB correct
37 Correct 18 ms 1416 KB correct
38 Correct 52 ms 2124 KB correct
39 Correct 44 ms 2004 KB correct
40 Correct 45 ms 2004 KB correct
41 Correct 55 ms 2132 KB correct
42 Correct 57 ms 2132 KB correct
43 Correct 41 ms 1848 KB correct
44 Correct 36 ms 1772 KB correct
45 Correct 46 ms 1748 KB correct
46 Correct 38 ms 1648 KB correct
47 Correct 28 ms 1512 KB correct
48 Correct 12 ms 1364 KB correct
49 Correct 17 ms 1412 KB correct
50 Correct 27 ms 1492 KB correct
51 Correct 41 ms 1748 KB correct
52 Correct 37 ms 1768 KB correct
53 Correct 35 ms 1628 KB correct
54 Correct 41 ms 1836 KB correct
55 Correct 43 ms 1748 KB correct
56 Correct 47 ms 1748 KB correct
57 Correct 44 ms 1748 KB correct
58 Correct 1 ms 232 KB correct
59 Correct 1 ms 1236 KB correct
60 Correct 159 ms 3616 KB correct
61 Correct 254 ms 4564 KB correct
62 Correct 290 ms 4568 KB correct
63 Correct 242 ms 4616 KB correct
64 Correct 166 ms 4564 KB correct
65 Correct 181 ms 4564 KB correct
66 Correct 249 ms 4564 KB correct
67 Correct 275 ms 4568 KB correct
68 Correct 285 ms 4580 KB correct
69 Correct 263 ms 4672 KB correct
70 Correct 1 ms 1236 KB correct
71 Correct 249 ms 4568 KB correct
72 Correct 253 ms 4568 KB correct
73 Correct 0 ms 212 KB correct
74 Correct 258 ms 4544 KB correct
75 Correct 250 ms 5348 KB correct
76 Correct 142 ms 2964 KB correct
77 Correct 275 ms 5500 KB correct
78 Correct 256 ms 5492 KB correct
79 Correct 266 ms 5652 KB correct
80 Correct 258 ms 5376 KB correct
81 Correct 185 ms 4812 KB correct
82 Correct 270 ms 5444 KB correct
83 Correct 233 ms 3408 KB correct
84 Correct 215 ms 4168 KB correct
85 Correct 209 ms 3588 KB correct
86 Correct 184 ms 2928 KB correct
87 Correct 168 ms 2388 KB correct
88 Correct 164 ms 2232 KB correct
89 Correct 150 ms 2260 KB correct
90 Correct 136 ms 2128 KB correct
91 Correct 76 ms 1472 KB correct
92 Correct 57 ms 1428 KB correct
93 Correct 202 ms 3588 KB correct
94 Correct 187 ms 2940 KB correct
95 Correct 206 ms 2896 KB correct
96 Correct 150 ms 2144 KB correct
97 Correct 159 ms 2264 KB correct
98 Correct 173 ms 2448 KB correct
99 Correct 166 ms 2260 KB correct
100 Correct 92 ms 1616 KB correct
101 Correct 49 ms 1460 KB correct
102 Correct 218 ms 3636 KB correct
103 Correct 233 ms 3508 KB correct
104 Correct 202 ms 3400 KB correct
105 Correct 205 ms 3492 KB correct