Submission #346354

#	Time	Username	Problem	Language	Result	Execution time	Memory
346354		dennisstar	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	943 ms	76268 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
using namespace std;
using ll = long long;

ll find_maximum(int K, vector<vector<int>> X) {
	int N = X.size(), M=X[0].size();

	ll R=0;
	vector<int> T(N), l(N), r(N);
	priority_queue<pair<int, int>> pq;
	for (int i=0; i<N; i++) {
		pq.emplace(X[i][M-1]+X[i][K-1], i);
		for (int j=0; j<K; j++) R-=X[i][j];
	}

	for (int i=0; i<K*N/2; i++) {
		int j=pq.top().second;
		R+=pq.top().first;
		pq.pop();
		T[j]++;
		if (T[j]<K)
			pq.emplace(X[j][M-1-T[j]]+X[j][K-1-T[j]], j);
	}
	
	vector<vector<int>> A;
	while (pq.size()) pq.pop();
	for (int i=0; i<N; i++)
		A.emplace_back(vector<int>(M, -1)),
		pq.emplace(T[i], i);

	for (int i=0; i<K; i++) {
		vector<int> chk(N);
		for (int j=0; j<N/2; j++) chk[pq.top().second]=1, pq.pop();
		for (int j=0; j<N; j++) {
			if (chk[j]) {
				l[j]++;
				A[j][M-l[j]]=i;
				pq.emplace(T[j]-l[j], j);
			}
			else A[j][r[j]]=i, r[j]++;
		}
	}

	allocate_tickets(A);
	return R;
}

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