Submission #983831

#	Time	Username	Problem	Language	Result	Execution time	Memory
983831		phoenix0423	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	2641 ms	90768 KiB

tickets

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define pb push_back
#define eb emplace_back
#include "tickets.h"
const int maxn = 1505;
const ll INF = 1e18;
ll dp[maxn][maxn];

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int>> ans(n, vector<int>(m, -1));
	ll c = 0;
	vector<int> l(n, 0), r(n, m - 1);
	while(k--){
		for(int i = 0; i <= n; i++) for(int j = 0; j <= n / 2; j++) dp[i][j] = -INF;
		dp[0][0] = 0;
		for(int i = 0; i < n; i++){
			for(int j = 0; j <= n / 2; j++){
				dp[i + 1][j] = max(dp[i + 1][j], dp[i][j] - x[i][l[i]]);
				dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i][j] + x[i][r[i]]);
			}
		}
		c += dp[n][n / 2];
		int cnt = n / 2;
		for(int i = n - 1; i >= 0; i--){
			if(dp[i][cnt] - x[i][l[i]] == dp[i + 1][cnt]){
				ans[i][l[i]] = k;
				l[i] ++;
			}
			else{
				ans[i][r[i]] = k;
				r[i] --;
				cnt--;
			}
		}
	}
	allocate_tickets(ans);
	return c;
}

• 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