Submission #249452

#	Time	Username	Problem	Language	Result	Execution time	Memory
249452		cheeheng	Meetings (JOI19_meetings)	C++14	29 / 100	3083 ms	9216 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
using namespace std;

int lca[2005][2005];

void dfs(int u, vector<int> possible){
    set<int> impossible;
    random_shuffle(possible.begin(), possible.end());
    for(int v: possible){
        if(impossible.find(v) != impossible.end()){continue;}
        bool boleh = true;
        for(int x: possible){
            if(lca[v][x] == v){
                impossible.insert(x);
            }else if(lca[v][x] == u){
            }else{
                boleh = false;
                break;
            }
        }
        if(boleh){
            vector<int> possible2;
            for(int x: possible){
                if(lca[v][x] == v && v != x){
                    possible2.push_back(x);
                }
            }
            Bridge(min(u, v), max(u, v));
            dfs(v, possible2);
        }else{
            impossible.insert(v);
        }
    }
}

void Solve(int N) {
    lca[0][0] = 0;
    for(int i = 1; i < N; i ++){
        lca[0][i] = 0;
        lca[i][0] = 0;
    }
    for(int i = 1; i < N; i ++){
        lca[i][i] = i;
        for(int j = i+1; j < N; j ++){
            lca[i][j] = Query(0, i, j);
            lca[j][i] = lca[i][j];
        }
    }

    vector<int> possible;
    for(int i = 1; i < N; i ++){
        possible.push_back(i);
    }

    dfs(0, possible);
}

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 0 / 71