Submission #249450

#	Time	Username	Problem	Language	Result	Execution time	Memory
249450		dantoh000	Meetings (JOI19_meetings)	C++14	29 / 100	2089 ms	1052 KiB

meetings

#include "meetings.h"

#include <bits/stdc++.h>
using namespace std;
void solve(vector<int> v, int root){
    //printf("solving ");
    //for (auto x : v) printf("%d ",x);
    //printf(", %d\n",root);
    if (v.size() == 1) return;
    if (v.size() == 2){
        if (v[0] > v[1]) swap(v[0],v[1]);
        Bridge(v[0],v[1]);
        return;
    }
    random_shuffle(v.begin(),v.end());
    int cur = v[0] == root ? v[1] : v[0];
    //printf("cur %d, root %d\n",cur,root);
    for (auto x : v){
        if (x == cur || x == root ) continue;
        int Q = Query(root,cur,x);
        if (Q != root) cur = Q;
    }
    //printf("cur %d, root %d\n",cur,root);
    if (cur > root) swap(cur,root);
    Bridge(cur,root);
    vector<int> L, R;
    for (auto x : v){
        if (x == cur || x == root) continue;
        int Q = Query(root,cur,x);
        assert(Q == root || Q == cur);
        if (Q == root) R.push_back(x);
        else L.push_back(x);
    }
    L.push_back(cur);
    R.push_back(root);
    solve(L,cur);
    solve(R,root);
}
void Solve(int N) {
    vector<int> cur;
    for (int i = 0; i < N; i++) cur.push_back(i);
    solve(cur,0);
}

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