Submission #123980

#	Time	Username	Problem	Language	Result	Execution time	Memory
123980		songc	Meetings (JOI19_meetings)	C++14	100 / 100	1315 ms	1084 KiB

meetings

#include <bits/stdc++.h>
#include "meetings.h"
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;

vector<int> adj[2020];
vector<int> V[2020];
bool chk[2020];

void f(int u){
    if (V[u].size() <= 1) return;
    vector<int> P = V[u];
    V[u].clear();
    int v = P[rand() % P.size()];
    while (v == u) v = P[rand() % P.size()];
    vector<int> S;
    S.push_back(u); V[u].push_back(u);
    S.push_back(v); V[v].push_back(v);
    for (int w : P){
        if (w == u || w == v) continue;
        int ret = Query(u, v, w);
        V[ret].push_back(w);
        S.push_back(ret);
    }
    sort(S.begin(), S.end());
    S.erase(unique(S.begin(), S.end()), S.end());
    sort(S.begin(), S.end(), [&](int a, int b){
        if (a == u || b == v) return true;
        if (a == v || b == u) return false;
        return Query(a, b, u) == a;
    });
    for (int i=0; i<(int)S.size()-1; i++){
        if (S[i] < S[i+1]) Bridge(S[i], S[i+1]);
        else Bridge(S[i+1], S[i]);
    }
    for (int w : S) f(w);
}

void Solve(int N) {
    for (int i=0; i<N; i++) V[0].push_back(i);
    f(0);
}

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