Submission #303311

#	Time	Username	Problem	Language	Result	Execution time	Memory
303311		baluteshih	Carnival Tickets (IOI20_tickets)	C++14	25 / 100	1103 ms	85312 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;
struct mode
{
    int x,i,j;
    bool operator<(const mode &a)const{
        return x<a.x;
    }
};

ll find_maximum(int k, vector<vector<int>> x)
{
	int n = x.size();
	int m = x[0].size();
    ll rt=0;
    vector<vector<int>> answer(n,vector<int>(m,-1));
    vector<vector<int>> used(n,vector<int>(m,0));
    vector<int> cnt(n,0),num(n,0),nw(n,0),tp(n,0);
    vector<mode> v;
    for(int i=0;i<n;++i)
        for(int j=0;j<m;++j)
            v.pb(mode{x[i][j],i,j});
    sort(ALL(v));
    for(int i=n*m/2;i<SZ(v);++i)
        ++cnt[v[i].i];
    for(int i=0;i<n;++i)
        nw[i]=m-cnt[i],num[i]=i,tp[i]=cnt[i];
    for(int i=0;i<m;++i)
    {
        sort(ALL(num),[&](int a,int b){return cnt[a]>cnt[b];});
        for(int j=0;j<n/2;++j)
            rt+=x[num[j]][m-tp[num[j]]+(--cnt[num[j]])],answer[num[j]][m-tp[num[j]]+cnt[num[j]]]=i;
        for(int j=n/2;j<n;++j)
            rt-=x[num[j]][--nw[num[j]]],answer[num[j]][nw[num[j]]]=i;
    }
    allocate_tickets(answer);
	return rt;
}

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