Submission #305947

#	Time	Username	Problem	Language	Result	Execution time	Memory
305947		baluteshih	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	957 ms	63352 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
#define X first
#define Y second
#define ALL(v) v.begin(),v.end()
#define SZ(a) ((int)a.size())
#define pb push_back

const ll INF=1e18;

ll find_maximum(int k, vector<vector<int>> x)
{
	int n = x.size();
	int m = x[0].size();
    int tar=n*k/2;
    ll sum=0;
    vector<vector<int>> answer(n,vector<int>(m,-1)),que(n,vector<int>(k,0));
    vector<int> cnt(n,0),num(n,0),nw(n,0),tp(n,0),pl(n,0);
    priority_queue<pii> pq;
    for(int i=0;i<n;++i)
    {
        for(int j=0;j<k;++j)
            sum-=x[i][j];
        for(int j=1;j<=k;++j)
            que[i][j-1]=x[i][k-j]+x[i][m-j];
        pq.push(pii(que[i][0],i));
    }
    for(int i=0;i<tar;++i)
    {
        auto u=pq.top();
        pq.pop();
        ++cnt[u.Y],++pl[u.Y],sum+=u.X;
        if(pl[u.Y]<k)
            pq.push(pii(que[u.Y][pl[u.Y]],u.Y));
    }
    for(int i=0;i<n;++i)
        nw[i]=k-cnt[i],num[i]=i,tp[i]=cnt[i];
    for(int i=0;i<k;++i)
    {
        sort(ALL(num),[&](int a,int b){return cnt[a]>cnt[b];});
        for(int j=0;j<n/2;++j)
            answer[num[j]][m-tp[num[j]]+(--cnt[num[j]])]=i;
        for(int j=n/2;j<n;++j)
            answer[num[j]][--nw[num[j]]]=i;
    }
    allocate_tickets(answer);
	return sum;
}

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