Submission #411463

#	Time	Username	Problem	Language	Result	Execution time	Memory
411463		Blagojce	Meetings (JOI19_meetings)	C++17	100 / 100	765 ms	1360 KiB

meetings

#include <bits/stdc++.h>
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)


using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1e9+7;
const ld eps = 1e-13;
const ld pi  = 3.14159265359;

mt19937 _rand(time(NULL));
clock_t z;

const int mxn = 2e5+5;

#include "meetings.h"
/*
void bridge(int a, int b){
	cout<<"bridge : "<<a<<"-"<<b<<endl;
}
int Query(int a, int b, int c){
	cout<<a<<' '<<b<<' '<<c<<endl;
	int d;
	cin >> d;
	return d;
}*/

int cpr[mxn];

vector<int> Sort(vector<int> v, int l, int r){
	if((int)v.size() <= 1) return v;
	
	int pivot = v[_rand()%(int)v.size()];
	
	vector<int> L;
	vector<int> R;
	for(auto u : v){
		if(u == pivot) continue;
		int q = Query(l, u, pivot);
		if(q == u){
			L.pb(u);
		}
		else{
			R.pb(u);
		}
	}
	L = Sort(L, l, pivot);
	R = Sort(R, pivot, r); 
	v.clear();
	for(auto u : L) v.pb(u);
	v.pb(pivot);
	for(auto u : R) v.pb(u);
	return v;
}
void bridge(int a, int b){
	Bridge(min(a,b), max(a,b));
}


void solve(vector<int> v){
	sort(all(v));
	v.erase(unique(all(v)), v.end());
	
	
	
	int m = (int)v.size();
	
	if(m <= 1) return;
	if(m == 2){
		bridge(v[0], v[1]);
		return;
	}
	int a = _rand()%m;
	int b = _rand()%(m-1);
	if(b >= a) ++b;
	
	
	
	a = v[a];
	b = v[b];
	
	
	vector<int> g[m];
	fr(i, 0, m){
		cpr[v[i]] = i;
		g[i].pb(v[i]);
	}
	
	vector<int> diam;
	fr(i, 0, m){
		if(v[i] == a || v[i] == b) continue;
		int q = Query(a, b, v[i]);
		g[cpr[q]].pb(v[i]);
		if(q != a && q != b) diam.pb(q);
	}
	sort(all(diam));
	diam.erase(unique(all(diam)), diam.end());
	diam = Sort(diam, a, b);
	diam.insert(diam.begin(), a);
	diam.pb(b);
	fr(i, 0, (int)diam.size()-1){
		bridge(diam[i], diam[i+1]);
	}
	fr(i, 0, m){
		solve(g[i]);	
	}
}

void Solve(int N){
	vector<int> v;
	fr(i, 0, N) v.pb(i);
	solve(v);
}

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