Submission #344329

#	Time	Username	Problem	Language	Result	Execution time	Memory
344329		amunduzbaev	Meetings (JOI19_meetings)	C++14	100 / 100	877 ms	1024 KiB

meetings

/** made by amunduzbaev **/

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

#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
#define vpii vector<pii>
#define vpll vector<pll>
#define cnt(a)__builtin_popcount(a)
template<class T> bool umin(T& a, const T& b) {return a > b? a = b, true:false;}
template<class T> bool umax(T& a, const T& b) {return a < b? a = b, true:false;}
 
const int NN = 2e3+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);

int aa; //, used[NN][NN];

bool cmp(int a, int b){
	return Query(b, aa, a) == a;
}

void add(int x, int y){
	if(y < x) swap(x, y);
	//cout<<x<<" "<<y<<endl;
	Bridge(x, y);
}

void res(vii vv){
	if(sz(vv) < 2) return;
	if(sz(vv) == 2){
		add(vv[0], vv[1]);
		return; 
	}
	
	random_shuffle(all(vv));
	int a = vv[0], b = vv[1];
	
	map<int, vii> tmp;
	vii path;
	
	for(int i=0;i<sz(vv);i++){
		if(vv[i] == a || vv[i] == b) continue;
		int res = Query(a, b, vv[i]);
		if(!sz(tmp[res]) && res != a && res != b) path.pb(res);
		tmp[res].pb(vv[i]);
	}
	
	
	
	if(path.empty()){
		add(a, b);
	}
	else{
		aa = a;
		sort(all(path), cmp);
		add(a, path[0]);
		for(int i=0;i<sz(path)-1;i++){
			add(path[i], path[i+1]);
		}
		add(*path.rbegin(), b);
	}
	
	tmp[a].pb(a);
	tmp[b].pb(b);
	
	for(auto x:tmp)	res(x.ss);
	
}

void Solve(int n){
	vii vv;
	for(int i=0;i<n;i++) vv.pb(i);
	res(vv);
}
/*

8
0 1
0 2
0 7
3 7
6 7
4 6
5 6

8
1 2
1 4
0 1
0 3
0 5
5 6
3 7
 
5
0 1
0 2
1 3
1 4

*/

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