Submission #1045290

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045290		mariaclara	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	276 ms	73236 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second

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

	vector<ll> dp(n/2+1), last(n/2+1);
	vector<vector<int>> ans(n);
	vector<vector<bool>> pai(n);

	for(int i = 0; i < n; i++) {
		ans[i].resize(m, -1);
		pai[i].resize(n/2+1);

		dp[0] -= x[i][0];
		for(int j = 1; j <= n/2; j++) {
			ll a = last[j] - (ll)x[i][0], b = last[j-1] + (ll)x[i].back();
			if(a > b) pai[i][j] = 0, dp[j] = a;
			else pai[i][j] = 1, dp[j] = b;

			//cout << "[" << i << ", " << j << "] = " << dp[j] << "\n";
		}
		
		last = dp;
	}

	for(int i = n-1, j = n/2; i >= 0; i--) {
		if(pai[i][j]) ans[i][m-1] = 0, j--;
		else ans[i][0] = 0;
	}

	allocate_tickets(ans);
	return dp[n/2];
}

• 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