Submission #300782

#	Time	Username	Problem	Language	Result	Execution time	Memory
300782		haojiandan	Carnival Tickets (IOI20_tickets)	C++14	100 / 100	1238 ms	63280 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
priority_queue<pair<ll,int> > q;
ll sum;
int pos[1510],tot,st[1510][1510],R[1510],L[1510];
pair<int,int> d[1510];
int vis[1510];
ll find_maximum(int k, vector<vector<int> > x) {
	int n = x.size();
	int m = x[0].size();
	vector<vector<int> > ans;
	for (int i = 0; i < n; i++) {
		vector<int> row(m);
		for (int j = 0; j < m; j++) row[j]=-1;
		ans.push_back(row);
	}
	for (int i=0;i<n;i++) {
		for (int j=0;j<k;j++) st[i][j]=-1;
		q.push(make_pair(x[i][k-1]+x[i][m-1],i));
		pos[i]=1;
	}
	for (int I=1;I<=n*k/2;I++) {
		int i=q.top().second; q.pop();
		st[i][k-pos[i]]++,st[i][m-pos[i]]++;
		pos[i]++;
		if (k-pos[i]>=0) {
			q.push(make_pair(x[i][k-pos[i]]+x[i][m-pos[i]],i));
		}
	}
	for (int i=0;i<n;i++) R[i]=pos[i],vis[i]=-1;
	tot=-1;
	while (k--) {
		for (int i=0;i<n;i++) d[i]=make_pair(R[i],i);
		sort(d,d+n); reverse(d,d+n);
		tot++;
		for (int i=0;i<n/2;i++) vis[d[i].second]=tot;
		for (int i=0;i<n;i++)
			if (vis[i]==tot) {
				ans[i][m-R[i]+1]=tot;
				R[i]--;
			} else {
				ans[i][L[i]]=tot;
				L[i]++;
			}
	}
	allocate_tickets(ans);
	for (int i=0;i<n;i++) for (int j=0;j<m;j++) sum+=st[i][j]*x[i][j];
	return sum;
}

• 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