Submission #1291776

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291776		gustavo_d	Carnival Tickets (IOI20_tickets)	C++20	11 / 100	10 ms	580 KiB

tickets

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

#define sz(v) (int)(v).size()

typedef long long ll;

const int MAXN = 1500;

int mx[MAXN], mn[MAXN];
int pai[MAXN][MAXN];
int dp[MAXN][MAXN];
int a[MAXN];

ll find_maximum(int k, vector<vector<int>> x) {
	int n = sz(x);
	int m = sz(x[0]);

	for (int i=0; i<n; i++) {
		for (int j=0; j<m; j++) {
			if (x[i][j] > x[i][mx[i]]) mx[i] = j;
			if (x[i][j] < x[i][mn[i]]) mn[i] = j;
		}
	}

	ll ans = 0;
	vector<bool> ansGotMx(n, false);
	for (int i=0; i<n; i++) {
		vector<bool> resGotMx(n, false);
		vector<bool> got(n, false);
		ll res = 0;

		int med = x[i][mn[i]];
		int availableMn = n/2, availableMx = n/2;
		vector<tuple<int, int, int>> ord;
		for (int j=0; j<n; j++) {
			if (i == j) continue;
			if (x[j][mx[j]] < med) {
				availableMn--;
				res += abs(x[j][mn[j]] - med);
			} else if (x[j][mn[j]] > med) {
				availableMx--;
				res += abs(x[j][mx[j]] - med);
				resGotMx[j] = true;
			} else {
				ord.emplace_back(abs(x[j][mn[j]] - med), j, 0);
				ord.emplace_back(abs(x[j][mx[j]] - med), j, 1);
			}
		}
		sort(ord.begin(), ord.end());
		for (auto [gain, v, isMx] : ord) {
			if (got[v]) continue;
			if (gain == 0) {
				resGotMx[v] = isMx;
				continue;
			}
			got[v] = true;
			if (isMx and availableMx > 0) {
				availableMx--;
				res += gain;
			} else {
				availableMn--;
				res += abs(x[v][mn[v]] - med);
			}
		}

		if (availableMn < 0 or availableMx < 0) continue;

		if (res >= ans) {
			ans = res;
			swap(ansGotMx, resGotMx);
		}
	}

	vector<vector<int>> answer;
	for (int i = 0; i < n; i++) {
		vector<int> row(m, -1);
		if (ansGotMx[i]) row[mx[i]] = 0;
		else row[mn[i]] = 0;
		answer.push_back(row);
	}
	allocate_tickets(answer);
	return ans;
}

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