Submission #1313732

#	Time	Username	Problem	Language	Result	Execution time	Memory
1313732		BigBadBully	Carnival Tickets (IOI20_tickets)	C++20	100 / 100	1139 ms	132960 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
using namespace std;

long long find_maximum(signed k, vector<vector<signed>> v) {

    int n = v.size();
	int m = v[0].size();
    for(auto&vec:v)
        sort(vec.begin(),vec.end());
	vector<vector<signed>> answer(n,vector<signed>(m,-1));
    vector<int> plus(n,0);
    int ans = 0;
	priority_queue<pii> pq;
    for(int i = 0; i < n; i++)
        for(int j = 0; j+m-k < m; j++)
            pq.push({v[i][j]+v[i][j+m-k],i}),ans+=-v[i][j];
    {
        int cnt = 0;
        while (cnt < n * k / 2)
        {
            pii x = pq.top();
            pq.pop();
            cnt++;
            plus[x.ss]++;
            ans += x.ff;
        }
    }
    vector<int> sz(k,0);
    set<int> free;
    for(int i = 0; i < k; i++)
        free.insert(i);
    vector<set<int>> has(k);
    
    for(int i = 0; i< n; i++)
    {
        int j = 0;
        vector<int> iter;
        for(int x : free)
            iter.push_back(x);
        sort(iter.begin(),iter.end(),[&](int a,int b){return sz[a]<sz[b];});
        for(int x : iter)
        {
            if(j >= k-plus[i])
                break;
            answer[i][j] = x;
            sz[x]++;
            has[x].insert(i);
            j++;
        }
        set<int> neu;
        for(int x :free)
            if(sz[x]<n/2)
                neu.insert(x);
        free = neu;
    }

    for(int i = 0; i < k; i++)
        free.insert(i);

    for(int i = 0; i< n; i++)
    {
        int j = m-plus[i];
        vector<int> iter;
        for(int x : free)
            iter.push_back(x);
        sort(iter.begin(),iter.end(),[&](int a,int b){return sz[a]<sz[b];});
        for(int x : iter)
        {
            if(has[x].count(i))continue;
            if(j>=m)
                break;
            answer[i][j] = x;
            sz[x]++;
            j++;
        }
        set<int> neu;
        for(int x :free)
            if(sz[x]<n)
                neu.insert(x);
        free = neu;
    }
	allocate_tickets(answer);
	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