Submission #1009778

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009778		vjudge1	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	599 ms	103932 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
#define V vector
#define VI V<int>
V<VI> genalloc(V<VI>ones,V<VI>negs,int n,int m,int k){
    V<VI>ans(n,VI(m,-1));
    for(int i=0;i<k;i++){
        int cnto=0,cntn=0;
        vector<int>netrl;
        for(int j=0;j<n;j++){
            if(negs[j].empty())
                ans[j][ones[j].back()]=i,
                ones[j].pop_back(),cnto++;
            else if(ones[j].empty()) 
                ans[j][negs[j].back()]=i,
                negs[j].pop_back(),cntn++;
            else netrl.push_back(j);
        }
        for(auto j:netrl)if(cnto<n/2)
            ans[j][ones[j].back()]=i,
            ones[j].pop_back(),cnto++;
        else ans[j][negs[j].back()]=i,
            negs[j].pop_back(),cntn++;
    }
    return ans;
}
long long find_maximum(int k, V<VI> x) {
	int n = x.size();
	int m = x[0].size();
    priority_queue<pair<int,int>>pq;
    long long ans=0;
    V<VI> ones(n),negs(n);
    for(int i=0;i<n;i++)for(int j=0;j<k;j++) 
        negs[i].push_back(j),ans-=x[i][j],
        pq.push({x[i][j]+x[i][m-k+j],i});
    for(int q=0;q<n*k/2;q++){
        auto[x,y]=pq.top();
        ones[y].push_back(m-k+negs[y].back());
        negs[y].pop_back();pq.pop();ans+=x;
    }
	allocate_tickets(genalloc(ones,negs,n,m,k));
	return ans;
}

• 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