Submission #315598

#	Time	Username	Problem	Language	Result	Execution time	Memory
315598		VEGAnn	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	756 ms	53888 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define PB push_back
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define i2 array<int,2>
using namespace std;
typedef long long ll;
const int N = 1600;
const ll OO = 1e18;
priority_queue<i2> pq;
int ptr[N], cand[N], siz[N];
bool was[N][N];

long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size();
	int m = x[0].size();

	vector<vector<int>> answer;

	for (int i = 0; i < n; i++) {
		std::vector<int> row(m);

		fill(all(row), -1);

		answer.push_back(row);
	}

	ll ans = 0;

    for (int i = 0; i < n; i++){
        for (int j = 0; j < k; j++)
            ans += x[i][m - k + j];

        ptr[i] = 0;
        cand[i] = 0;

        pq.push({-x[i][m - k] - x[i][0], i});
    }

    // add again to pq only if ptr < m

    for (int itr = (n / 2) * k; itr > 0; itr--){
        i2 now = pq.top(); pq.pop();

        ans += now[0];
        int id = now[1];

        while (cand[id] < k && siz[cand[id]] == n / 2){
            cand[id]++;
        }

        assert(cand[id] < k);

        was[id][cand[id]] = 1;
        siz[cand[id]]++;
        answer[id][ptr[id]] = cand[id]++;

        ptr[id]++;

        if (ptr[id] < k){
            pq.push({-x[id][m - k + ptr[id]] - x[id][ptr[id]], id});
        }
    }

    // add last tickets

    for (int i = 0; i < n; i++){
        int now = 0;

        for (int j = ptr[i]; j < k; j++){
            while (now < k && was[i][now]) now++;

            assert(now < k);

            was[i][now] = 1;
            answer[i][m - k + j] = now++;
        }
    }

    allocate_tickets(answer);

	return ans;
}

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