Submission #414625

#	Time	Username	Problem	Language	Result	Execution time	Memory
414625		cfalas	Carnival Tickets (IOI20_tickets)	C++14	62 / 100	3076 ms	309232 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});
		}
	}
	FOR(step, n*k/2){
		vii maxa;
		FOR(i,n){
			if(minus[i].size() && unused[i].size())
			maxa.push_back({ - ((*unused[i].rbegin()).F + (*minus[i].rbegin()).F), i});
		}
		sort(maxa.begin(), maxa.end());

		ans -= maxa[0].F;
		ll i = maxa[0].S;

		// 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());

		/*
		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;*/
	}

	FOR(rnd,k){
		vector<iii> pc;
		FOR(i,n){
			int p=0;
			int lp=0;
			FOR(j,m) if(answer[i][j]>=PLUS && answer[i][j]<MINUS) p++, lp=j;
			pc.push_back({{-p,i},lp});
		}
		sort(pc.begin(), pc.end());
		set<int> used;
		FOR(i,n/2){
			used.insert(pc[i].F.S);
			answer[pc[i].F.S][pc[i].S] = rnd;
		}
		FOR(i,n) if(!used.count(i)){
			bool f = false;
			FOR(j,m) if(answer[i][j]>=MINUS){
				answer[i][j] = rnd;
				f = true;
				break;
			}
			assert(f);
		}
		/*
		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: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 0 / 10