oj.uz

Submission #844112

# Submission time Handle Problem Language Result Execution time Memory
844112 2023-09-05T09:22:44 Z sjimed Meetings (JOI19_meetings) C++14
100 / 100
 841 ms 1224 KB 
#include "meetings.h"
#include<bits/stdc++.h>  
using namespace std;

#define fast ios::sync_with_stdio(false); cin.tie(0);
#define fi first
#define se second
#define pb push_back
#define em emplace
#define eb emplace_back
#define mp make_pair
#define all(v) (v).begin(), (v).end()
#define pre(x) cout<<fixed; cout.precision(x);

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const int inf = 1e9;
const ll INF = 1e18;

int n;
vector<int> g[2010];
int sz[2010];
bool chk[2010];
bool in[2010];

int cnt;
const int MX = 100000;

int q(int u, int v, int w) {
  cnt++;
  assert(0 <= u && u < n);
  assert(0 <= v && v < n);
  assert(0 <= w && w < n);

  assert(u != v && v != w && w != u);
  assert(cnt <= 100000);
  return Query(u, v, w);
}

void dfs(int x, int p = 0) {
  sz[x] = 1;
  for(auto i : g[x]) {
    if(i == p || chk[i]) continue;
    dfs(i, x);
    sz[x] += sz[i];
  }
}

int Cen(int x) {
  int s = 1, mx = 0, mxi;
  for(auto i : g[x]) {
    if(chk[i]) continue;
    s += sz[i];
    if(sz[i] > mx) mx = sz[i], mxi = i;
  }
  if(mx > s/2) {
    sz[x] = s - mx;
    return Cen(mxi);
  }
  return x;
}

pii Find(int x) {
  memset(chk, 0, sizeof(chk));
  int r = 0;
  while(1) {
    dfs(r);
    r = Cen(r);
    //cout << r << "!!!" << endl;
    sort(all(g[r]), [](int i, int j) {
      return sz[i] > sz[j];
    });
    for(int i=0; i<g[r].size(); i+=2) {
      if(i+1 == g[r].size()) {
        if(q(g[r][i], r, x) != r) {
          if(chk[g[r][i]]) return mp(r, g[r][i]);
          chk[r] = true;
          r = g[r][i];
          break;
        }
      }
      else if(q(g[r][i], g[r][i+1], x) != r) {
        chk[r] = true;
        int nr;
        if(q(g[r][i], r, x) != r) nr = g[r][i];
        else nr = g[r][i+1];
        if(chk[nr]) return mp(r, nr);
        r = nr;
        break;
      }
      if(i+2 >= g[r].size()) return mp(r, r);
    }
  }
}

void Solve(int N) {
  n = N;

  cnt = 0;
  for(int i=0; i<n; i++) g[i].clear(), chk[i] = in[i] = false;

  g[0].eb(1);
  g[1].eb(0);

  for(int i=2; i<n; i++) {
    if(in[i]) continue;
    int u, v;
    tie(u, v) = Find(i);
    //cout << i << ": " << u << " " << v << "\n";
    if(u == v) {
      g[u].eb(i);
      g[i].eb(u);
      continue;
    }
    int tmp = q(u, v, i);
    //cout << tmp << "!\n";
    if(tmp == u) {
      g[u].eb(i);
      g[i].eb(u);
    }
    else if(tmp == v) {
      g[v].eb(i);
      g[i].eb(v);
    }
    else {
      if(tmp != i) {
        g[tmp].eb(i);
        g[i].eb(tmp);
      }
      g[tmp].eb(u);
      g[tmp].eb(v);
      for(auto &j : g[u]) if(j == v) j = tmp;
      for(auto &j : g[v]) if(j == u) j = tmp;
      in[tmp] = true;
    }
  }

  int e = 0;
  for(int i=0; i<n; i++) {
    for(auto j : g[i]) {
      if(i < j) {
        e++;
        Bridge(i, j);
      }
    }
  }
  assert(e == n-1);
}

Compilation message

meetings.cpp: In function 'pii Find(int)':
meetings.cpp:74:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |     for(int i=0; i<g[r].size(); i+=2) {
      |                  ~^~~~~~~~~~~~
meetings.cpp:75:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |       if(i+1 == g[r].size()) {
      |          ~~~~^~~~~~~~~~~~~~
meetings.cpp:92:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |       if(i+2 >= g[r].size()) return mp(r, r);
      |          ~~~~^~~~~~~~~~~~~~
meetings.cpp: In function 'int Cen(int)':
meetings.cpp:51:22: warning: 'mxi' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |   int s = 1, mx = 0, mxi;
      |                      ^~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 544 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 596 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 544 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 596 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Correct 0 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 544 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 596 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Correct 0 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 344 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 5 ms 344 KB Output is correct
28 Correct 6 ms 564 KB Output is correct
29 Correct 5 ms 344 KB Output is correct
30 Correct 5 ms 344 KB Output is correct
31 Correct 5 ms 344 KB Output is correct
32 Correct 4 ms 344 KB Output is correct
33 Correct 6 ms 344 KB Output is correct
34 Correct 9 ms 344 KB Output is correct
35 Correct 6 ms 344 KB Output is correct
36 Correct 6 ms 344 KB Output is correct
37 Correct 11 ms 600 KB Output is correct
38 Correct 11 ms 600 KB Output is correct
39 Correct 9 ms 600 KB Output is correct

Subtask #4
71.0 / 71.0

# Verdict Execution time Memory Grader output
1 Correct 353 ms 736 KB Output is correct
2 Correct 356 ms 600 KB Output is correct
3 Correct 377 ms 952 KB Output is correct
4 Correct 330 ms 744 KB Output is correct
5 Correct 346 ms 740 KB Output is correct
6 Correct 325 ms 848 KB Output is correct
7 Correct 328 ms 764 KB Output is correct
8 Correct 376 ms 600 KB Output is correct
9 Correct 339 ms 776 KB Output is correct
10 Correct 315 ms 968 KB Output is correct
11 Correct 381 ms 712 KB Output is correct
12 Correct 514 ms 792 KB Output is correct
13 Correct 381 ms 980 KB Output is correct
14 Correct 381 ms 980 KB Output is correct
15 Correct 357 ms 716 KB Output is correct
16 Correct 391 ms 764 KB Output is correct
17 Correct 333 ms 700 KB Output is correct
18 Correct 359 ms 1020 KB Output is correct
19 Correct 366 ms 764 KB Output is correct
20 Correct 382 ms 712 KB Output is correct
21 Correct 377 ms 1224 KB Output is correct
22 Correct 377 ms 968 KB Output is correct
23 Correct 404 ms 736 KB Output is correct
24 Correct 368 ms 704 KB Output is correct
25 Correct 363 ms 964 KB Output is correct
26 Correct 359 ms 760 KB Output is correct
27 Correct 365 ms 956 KB Output is correct
28 Correct 392 ms 772 KB Output is correct
29 Correct 330 ms 964 KB Output is correct
30 Correct 315 ms 780 KB Output is correct
31 Correct 332 ms 764 KB Output is correct
32 Correct 841 ms 860 KB Output is correct
33 Correct 609 ms 884 KB Output is correct
34 Correct 5 ms 344 KB Output is correct
35 Correct 6 ms 344 KB Output is correct
36 Correct 5 ms 344 KB Output is correct
37 Correct 5 ms 344 KB Output is correct
38 Correct 5 ms 344 KB Output is correct
39 Correct 4 ms 596 KB Output is correct
40 Correct 5 ms 344 KB Output is correct
41 Correct 6 ms 344 KB Output is correct
42 Correct 6 ms 344 KB Output is correct
43 Correct 7 ms 344 KB Output is correct
44 Correct 10 ms 600 KB Output is correct
45 Correct 11 ms 600 KB Output is correct
46 Correct 9 ms 600 KB Output is correct
47 Correct 1 ms 344 KB Output is correct
48 Correct 0 ms 344 KB Output is correct
49 Correct 1 ms 344 KB Output is correct
50 Correct 1 ms 344 KB Output is correct
51 Correct 1 ms 344 KB Output is correct
52 Correct 0 ms 344 KB Output is correct
53 Correct 1 ms 344 KB Output is correct
54 Correct 1 ms 344 KB Output is correct
55 Correct 0 ms 340 KB Output is correct
56 Correct 1 ms 596 KB Output is correct
57 Correct 1 ms 344 KB Output is correct
58 Correct 1 ms 344 KB Output is correct
59 Correct 0 ms 344 KB Output is correct
60 Correct 0 ms 344 KB Output is correct
61 Correct 0 ms 344 KB Output is correct
62 Correct 0 ms 596 KB Output is correct
63 Correct 0 ms 344 KB Output is correct
64 Correct 0 ms 344 KB Output is correct
65 Correct 1 ms 344 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 0 ms 344 KB Output is correct
68 Correct 0 ms 344 KB Output is correct
69 Correct 1 ms 344 KB Output is correct
70 Correct 0 ms 344 KB Output is correct
71 Correct 0 ms 344 KB Output is correct
72 Correct 0 ms 344 KB Output is correct