Submission #554353

#	Time	Username	Problem	Language	Result	Execution time	Memory
554353		Ronin13	Carnival Tickets (IOI20_tickets)	C++14	11 / 100	2 ms	724 KiB

tickets

#include "tickets.h"
#include <vector>
#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
using namespace std;
long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
    int m = x[0].size();
    int curf[n], curl[n];
    for(int i = 0; i < n; i++){
        curf[i] = 0;
        curl[i] = m - 1;
    }
    vector <vector <int> >al;
    al.resize(n);
    for(int i = 0; i < n; i++)al[i].resize(m);
    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++)al[i][j] = -1;
    }
    ll ans = 0;
    int cnt = -1;
    while(k--){
        cnt++;
        multiset<pair<ll, int> > st;
        for(int i = 0; i < n; i++){
            int a= curf[i], b = curl[i];
            st.insert({x[i][a], i});
            st.insert({x[i][b], i});
        }
        int used[n];
        while(!st.empty()){
            pair<ll, int> cur = *st.begin();
            st.erase(st.begin());
            int ind  = cur.s;
            st.erase(st.find({x[ind][curl[ind]], ind}));
            if(st.empty()) continue;
            pair<ll, int> curr = *st.rbegin();
            int ind1= curr.s;
            st.erase(st.find(curr));
            st.erase(st.find({x[ind1][curf[ind1]], ind1}));
            ans += curr.f - cur.f;
            used[ind]  = 0;
            used[ind1] = 1;
        }
        for(int i = 0; i < n; i++){
            if(used[i]){
                al[i][curl[i]] = cnt;
                curl[i]--;
            }
            else al[i][curf[i]] = cnt, curf[i]++;
        }
    }
    allocate_tickets(al);
	return ans;
}

• 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