Submission #710855

#	Time	Username	Problem	Language	Result	Execution time	Memory
710855		PixelCat	Meetings (JOI19_meetings)	C++14	100 / 100	949 ms	1052 KiB

meetings

#include "meetings.h"

#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i, a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using LL = long long;
using pii = pair<int, int>;

const int MAXN = 2010;

mt19937_64 rng(48763);
vector<pii> edges;

int m_qry(int a, int b, int c) {
    if(a == b) return a;
    if(a == c) return a;
    if(b == c) return b;
    return Query(a, b, c);
}

void solve(vector<int> &ids) {
    // for(auto &i:ids) cout << i << " ";
    // cout << endl;

    if(sz(ids) == 1) return;
    if(sz(ids) == 2) {
        edges.eb(ids[0], ids[1]);
        return;
    }

    int p1 = rng() % sz(ids);
    int p2 = rng() % sz(ids);
    while(p1 == p2) p2 = rng() % sz(ids);
    p1 = ids[p1]; p2 = ids[p2];
    map<int, vector<int>> mp;
    vector<int> rts;
    for(auto &i:ids) {
        int r = m_qry(p1, p2, i);
        rts.eb(r);
        mp[r].eb(i);
    }
    for(auto &it:mp) solve(it.S);
    sort(all(rts));
    rts.erase(unique(all(rts)), rts.end());
    sort(all(rts), [&](int a, int b) {
        return m_qry(p1, a, b) == a;
    });
    For(i, 0, sz(rts) - 2) edges.eb(rts[i], rts[i + 1]);
}

void Solve(int32_t n) {
    edges.clear();
    vector<int> ids(n);
    For(i, 0, n - 1) ids[i] = i;
    solve(ids);
    for(auto &p:edges) {
        if(p.F > p.S) swap(p.F, p.S);
        Bridge(p.F, p.S);
    }
}
//   int x = Query(0, 1, 2);
//   for (int u = 0; u < N - 1; ++u) {
//     Bridge(u, u + 1);
//   }

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71