Submission #405875

#	Time	Username	Problem	Language	Result	Execution time	Memory
405875		ngrace	Carnival Tickets (IOI20_tickets)	C++14	11 / 100	2 ms	844 KiB

tickets

#include "tickets.h"
 
#include <bits/stdc++.h>
using namespace std;
 
#define pipii pair<long long,pair<int,int>>
#define pq priority_queue
#define vi vector<int>
#define vii vector<vector<int>>
#define v vector
 
long long find_maximum(int k, vii x) {
    long long out=0;
    int n=x.size();//num colours
    int m=x[0].size();//num of each colour
    
    pq<pipii> mi;
 
    v<v<pipii>> l(n);
    v<v<pipii>> s(n);
    
    vii answer(n,vi(m,-1));
    
    for(int i=0;i<n;i++){//initilize long list
        pq<pipii> ma;
        for(int j=0;j<m;j++){
            ma.push({x[i][j],{i,j}});
            mi.push({-x[i][j],{i,j}});
        }
        for(int j=0;j<k;j++){
            pipii cur=ma.top();
            ma.pop();
            l[i].push_back(cur);
        }
    }
    int count=0;
    while(count<k*n/2){//transfer to short list
        pipii cur = mi.top();
        mi.pop();
        int ind=cur.second.first;
        if(x[ind].size()>0){
            l[ind].pop_back();
            s[ind].push_back({-cur.first,cur.second});
            count++;
        }
    }
    for(int i=0;i<k;i++){//allocate
        int sm=0;
        int la=0;
        for(int j=0;j<n;j++){
            if(sm==n/2){
                pipii cur=l[j][l[j].size()-1];
                answer[j][cur.second.second]=i;
                l[j].pop_back();
                out+=cur.first;
                la++;
            }
            else if(la==n/2){
                pipii cur=s[j][s[j].size()-1];
                answer[j][cur.second.second]=i;
                s[j].pop_back();
                out-=cur.first;
                sm++;
            }
            else if(l[j].size()>0){
                pipii cur=l[j][l[j].size()-1];
                answer[j][cur.second.second]=i;
                l[j].pop_back();
                out+=cur.first;
                la++;
            }
            else{
                pipii cur=s[j][s[j].size()-1];
                answer[j][cur.second.second]=i;
                s[j].pop_back();
                out-=cur.first;
                sm++;
            }
        }
    }
	allocate_tickets(answer);
    return out;
}

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