Submission #414633

#	Time	Username	Problem	Language	Result	Execution time	Memory
414633		cfalas	Carnival Tickets (IOI20_tickets)	C++14	76 / 100	3079 ms	309272 KiB

tickets

#include "tickets.h"
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)

#define MINUS 2*MOD+2
#define PLUS MOD+1

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	vector<vi> answer(n);
	answer.assign(n, vector<int>(m, -1));

	ll ans=0;

	vector<multiset<ii> > minus(n), unused(n);
	FOR(i,n){
		vii b;
		FOR(j,m) b.push_back({x[i][j], j}), unused[i].insert({x[i][j], j});
		sort(b.begin(), b.end());
		FOR(j,k){
			answer[i][b[j].S] = MINUS;
			ans-=x[i][b[j].S];
			minus[i].insert({x[i][b[j].S], b[j].S});
			//unused[i].erase({x[i][b[j].S], b[j].S});
		}
	}
	set<ii> maxa;
	FOR(i,n){
		if(minus[i].size() && unused[i].size())
		maxa.insert({ - ((*unused[i].rbegin()).F + (*minus[i].rbegin()).F), i});
	}
	FOR(step, n*k/2){
		ans -= (*maxa.begin()).F;
		ll i = (*maxa.begin()).S;
		maxa.erase(maxa.begin());

		// change from - to unused
		answer[i][(*minus[i].rbegin()).S] = -1;
		//unused[i].insert(*minus[i].rbegin());
		minus[i].erase(--minus[i].end());

		// change from unused to +
		answer[i][(*unused[i].rbegin()).S] = PLUS;
		unused[i].erase(*unused[i].rbegin());
		
		if(minus[i].size() && unused[i].size())
			maxa.insert({ - ((*unused[i].rbegin()).F + (*minus[i].rbegin()).F), i});

		/*
		cout<<ans<<endl;
		FOR(i,n){
			FOR(j,m){
				if(answer[i][j]>=MINUS) cout<<" - ";
				else if(answer[i][j]>=PLUS && answer[i][j]<=MINUS) cout<<" + ";
				else cout<<answer[i][j]<<" ";
			}
			cout<<endl;
		}
		cout<<endl;
		*/
	}

	set<ii> pc;
	vector<set<int> > plus(n);
	FOR(i,n){
		int p=0;
		FOR(j,m) if(answer[i][j]==PLUS) p++, plus[i].insert(j);
		pc.insert({-p,i});
	}
	FOR(rnd,k){
		set<int> used;
		int cnt=0;
		set<ii> pc_n;
		FOA(v,pc){
			if(cnt>=n/2) break;
			int i = v.S;

			used.insert(i);
			answer[i][*(plus[i].begin())] = rnd;
			plus[i].erase(plus[i].begin());

			ii v_n = v;
			v_n.F++;
			pc_n.insert(v_n);

			cnt++;
		}
		//cout<<endl;
		FOR(i,n/2) pc.erase(pc.begin());
		FOA(v, pc_n) pc.insert(v);

		/*
		FOR(i,n){
			FOR(j,m){
				if(answer[i][j]>=MINUS) cout<<" - ";
				else if(answer[i][j]>=PLUS && answer[i][j]<=MINUS) cout<<" + ";
				else cout<<answer[i][j]<<" ";
			}
			cout<<endl;
		}
		cout<<endl;
		*/

		FOR(i,n){
			if(!used.count(i)){
				if(minus[i].empty()) continue;
				ii v = *minus[i].begin();
				answer[i][v.S] = rnd;
				minus[i].erase(minus[i].begin());
			}
		}
		/*
		FOR(i,n){
			FOR(j,m) cout<<answer[i][j]<<" ";
			cout<<endl;
		}*/
	}
	
	allocate_tickets(answer);
	return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 14 / 14
• Subtask 4: 0 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 0 / 10