oj.uz

Submission #561921

# Submission time Handle Problem Language Result Execution time Memory
561921 2022-05-13T18:44:20 Z timreizin Meetings (JOI19_meetings) C++17
100 / 100
 649 ms 864 KB 
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")

#include "meetings.h"
#include <random>
#include <vector>
#include <set>
#include <numeric>
#include <algorithm>
#include <map>
#include <cassert>

using namespace std;

vector<vector<int>> adj;
mt19937 gen(555);
int q = 0;

int find(vector<int> vertices, int pivot, set<int> path)
{
    if (vertices.size() == 1) return vertices.front();
    if (vertices.size() == 2)
    {
        adj[vertices.front()].push_back(vertices.back());
        adj[vertices.back()].push_back(vertices.front());
    }
    else
    {
        vector<int> path;
        map<int, vector<int>> comps;
        int x = uniform_int_distribution<>(0, (int)vertices.size() - 1)(gen);
        int y = x;
        while (y == x) y = uniform_int_distribution<>(0, (int)vertices.size() - 1)(gen);
        x = vertices[x];
        y = vertices[y];
        for (int i = 0; i < vertices.size(); ++i)
        {
            if (x == vertices[i] || y == vertices[i]) continue;
            int r = Query(x, y, vertices[i]);
            ++q;
            if (r != vertices[i]) comps[r].push_back(vertices[i]);
            else path.push_back(r);
        }
        for (auto &[pivot, vertices]: comps)
        {
            /*vector<bool> used(vertices.size());
            int left = vertices.size();
            while (left)
            {
                int p = uniform_int_distribution<>(1, left)(gen);
                for (int i = 0; i < vertices.size(); ++i)
                {
                    p -= !used[i];
                    if (!p)
                    {
                        --left;
                        used[i] = true;
                        p = vertices[i];
                        break;
                    }
                }
                vector<int> next{p};
                set<int> path;
                for (int i = 0; i < vertices.size(); ++i)
                {
                    if (!used[i])
                    {
                        int r = Query(vertices[i], p, pivot);
                        ++q;
                        if (r != pivot)
                        {
                            used[i] = true;
                            --left;
                            next.push_back(vertices[i]);
                            if (r == vertices[i]) path.insert(r);
                        }
                    }
                }
                int e = find(next, p, path);
                adj[pivot].push_back(e);
                adj[e].push_back(pivot);
            }*/
            vertices.push_back(pivot);
            find(vertices, pivot, set<int>());
        }
        sort(path.begin(), path.end(), [&x](int a, int b) { return Query(x, a, b) == a; });
        if (!path.empty())
        {
            adj[x].push_back(path.front());
            adj[path.front()].push_back(x);
            adj[y].push_back(path.back());
            adj[path.back()].push_back(y);
        }
        else
        {
            adj[x].push_back(y);
            adj[y].push_back(x);
        }
        for (int i = 0; i + 1 < path.size(); ++i)
        {
            adj[path[i]].push_back(path[i + 1]);
            adj[path[i + 1]].push_back(path[i]);
        }
    }
    int v = pivot;
    while (!path.empty())
    {
        for (int u : adj[v])
        {
            if (path.find(u) != path.end())
            {
                path.erase(u);
                v = u;
            }
        }
    }
    return v;
}

void Solve(int n)
{
    adj.resize(n);
    set<int> path;
    vector<int> vertices(n);
    iota(vertices.begin(), vertices.end(), 0);
    find(vertices, 0, path);
    for (int i = 0; i < n; ++i)
    {
        for (int u : adj[i])
        {
            if (i < u) Bridge(i, u);
        }
    }
    assert(q <= 30000);
}

Compilation message

meetings.cpp: In function 'int find(std::vector<int>, int, std::set<int>)':
meetings.cpp:36:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         for (int i = 0; i < vertices.size(); ++i)
      |                         ~~^~~~~~~~~~~~~~~~~
meetings.cpp:99:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |         for (int i = 0; i + 1 < path.size(); ++i)
      |                         ~~~~~~^~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 0 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 0 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 0 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 0 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 0 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 0 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 0 ms 336 KB Output is correct
24 Correct 0 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 0 ms 336 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 0 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 0 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 0 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 0 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 0 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 0 ms 336 KB Output is correct
24 Correct 0 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 0 ms 336 KB Output is correct
27 Correct 5 ms 336 KB Output is correct
28 Correct 3 ms 336 KB Output is correct
29 Correct 4 ms 336 KB Output is correct
30 Correct 6 ms 336 KB Output is correct
31 Correct 6 ms 336 KB Output is correct
32 Correct 7 ms 336 KB Output is correct
33 Correct 6 ms 380 KB Output is correct
34 Correct 8 ms 408 KB Output is correct
35 Correct 9 ms 384 KB Output is correct
36 Correct 4 ms 388 KB Output is correct
37 Correct 8 ms 336 KB Output is correct
38 Correct 10 ms 336 KB Output is correct
39 Correct 5 ms 400 KB Output is correct

Subtask #4
71.0 / 71.0

# Verdict Execution time Memory Grader output
1 Correct 297 ms 620 KB Output is correct
2 Correct 384 ms 712 KB Output is correct
3 Correct 391 ms 680 KB Output is correct
4 Correct 356 ms 624 KB Output is correct
5 Correct 283 ms 608 KB Output is correct
6 Correct 281 ms 688 KB Output is correct
7 Correct 391 ms 664 KB Output is correct
8 Correct 346 ms 652 KB Output is correct
9 Correct 360 ms 684 KB Output is correct
10 Correct 352 ms 712 KB Output is correct
11 Correct 391 ms 788 KB Output is correct
12 Correct 433 ms 768 KB Output is correct
13 Correct 284 ms 708 KB Output is correct
14 Correct 230 ms 660 KB Output is correct
15 Correct 232 ms 624 KB Output is correct
16 Correct 315 ms 800 KB Output is correct
17 Correct 340 ms 704 KB Output is correct
18 Correct 227 ms 708 KB Output is correct
19 Correct 287 ms 696 KB Output is correct
20 Correct 354 ms 708 KB Output is correct
21 Correct 369 ms 652 KB Output is correct
22 Correct 469 ms 712 KB Output is correct
23 Correct 354 ms 680 KB Output is correct
24 Correct 366 ms 692 KB Output is correct
25 Correct 293 ms 784 KB Output is correct
26 Correct 305 ms 696 KB Output is correct
27 Correct 313 ms 712 KB Output is correct
28 Correct 458 ms 708 KB Output is correct
29 Correct 285 ms 688 KB Output is correct
30 Correct 386 ms 660 KB Output is correct
31 Correct 367 ms 864 KB Output is correct
32 Correct 649 ms 728 KB Output is correct
33 Correct 498 ms 724 KB Output is correct
34 Correct 4 ms 336 KB Output is correct
35 Correct 3 ms 336 KB Output is correct
36 Correct 4 ms 392 KB Output is correct
37 Correct 4 ms 336 KB Output is correct
38 Correct 4 ms 336 KB Output is correct
39 Correct 6 ms 336 KB Output is correct
40 Correct 9 ms 392 KB Output is correct
41 Correct 8 ms 336 KB Output is correct
42 Correct 8 ms 380 KB Output is correct
43 Correct 4 ms 336 KB Output is correct
44 Correct 7 ms 392 KB Output is correct
45 Correct 13 ms 388 KB Output is correct
46 Correct 5 ms 336 KB Output is correct
47 Correct 0 ms 336 KB Output is correct
48 Correct 1 ms 336 KB Output is correct
49 Correct 0 ms 336 KB Output is correct
50 Correct 1 ms 336 KB Output is correct
51 Correct 0 ms 336 KB Output is correct
52 Correct 0 ms 336 KB Output is correct
53 Correct 0 ms 336 KB Output is correct
54 Correct 0 ms 336 KB Output is correct
55 Correct 0 ms 336 KB Output is correct
56 Correct 0 ms 336 KB Output is correct
57 Correct 0 ms 336 KB Output is correct
58 Correct 1 ms 336 KB Output is correct
59 Correct 1 ms 336 KB Output is correct
60 Correct 0 ms 336 KB Output is correct
61 Correct 0 ms 336 KB Output is correct
62 Correct 0 ms 208 KB Output is correct
63 Correct 0 ms 336 KB Output is correct
64 Correct 0 ms 336 KB Output is correct
65 Correct 0 ms 336 KB Output is correct
66 Correct 1 ms 336 KB Output is correct
67 Correct 0 ms 336 KB Output is correct
68 Correct 0 ms 336 KB Output is correct
69 Correct 0 ms 336 KB Output is correct
70 Correct 0 ms 336 KB Output is correct
71 Correct 0 ms 336 KB Output is correct
72 Correct 0 ms 336 KB Output is correct