Submission #971127

#	Time	Username	Problem	Language	Result	Execution time	Memory
971127		12345678	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	3101 ms	108624 KiB

tickets

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

using namespace std;

#define ll long long

const int nx=1505;

pair<ll, int> dp[nx][nx];

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	ll n = x.size(), ans=0, cnt=0;
	ll m = x[0].size(), l[nx], r[nx];
	vector<vector<int>> res(n, vector<int> (m, -1));
    for (int i=1; i<=n; i++) l[i]=0, r[i]=m-1;
    for (int i=1; i<=n; i++) dp[0][i].first=-1e18;
    while (k--)
    {
        for (int i=1; i<=n; i++)
        {
            for (int j=0; j<=i; j++)
            {
                dp[i][j].first=-1e18;
                if (j!=0) dp[i][j]=max(dp[i][j], {dp[i-1][j-1].first-x[i-1][l[i]], 1});
                if (j!=i) dp[i][j]=max(dp[i][j], {dp[i-1][j].first+x[i-1][r[i]], 0});
            }
        }
        auto cur=dp[n][n/2];
        int cj=n/2;
        for (int i=n; i>=1; i--)
        {
            if (cur.second) res[i-1][l[i]++]=cnt;
            else res[i-1][r[i]--]=cnt;
            if (cur.second) cur=dp[i-1][--cj];
            else cur=dp[i-1][cj];
        }
        ans+=dp[n][n/2].first;
        cnt++;
    }
	allocate_tickets(res);
	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