Submission #588758

#	Time	Username	Problem	Language	Result	Execution time	Memory
588758		LIF	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	453 ms	73308 KiB

tickets

#include "tickets.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;
bool cmp(long long int x,long long int y)
{
	return x<y;
}
struct node
{
	int least;
	int maxn;
	long long int val;
	int id;
}nod[10005];
bool cmp2(node x,node y)
{
	return x.val < y.val;
}
long long find_maximum(int k, std::vector<std::vector<int> > x) {
	int mm = x[0].size(); //find the m;
	int n = x.size();
	vector<vector <int> > s;
	long long int a[20005];
	long long int sum =0;
	if(mm==1)
	{
		for(int i=0;i<n;i++)
		{
			vector <int> q;
			q.push_back(0);
			s.push_back(q);
		}
		
		
		for(int i=0;i<n;i++)
		{
			a[i] = x[i][0];
		}
		sort(a,a+n);
		long long int ans = a[n/2-1]+a[n/2];
		ans /=2;
		
		for(int i=0;i<n;i++)
		{
			sum += abs(ans - a[i]);
		}
		allocate_tickets(s);
		return sum;
	}
	if(k==1)
	{
		for(int i=0;i<n;i++)
		{
			long long int xx = x[i][0] + x[i][mm-1];
			nod[i].val = xx;
			nod[i].id = i;
			nod[i].least = x[i][0];
			nod[i].maxn = x[i][mm-1];
		}
		sort(nod,nod+n,cmp2); //from small to big
		for(int i=0;i<n;i++)
		{
			vector<int> q;
			for(int j=0;j<mm;j++)
			{
				q.push_back(-1);
				
			}
			s.push_back(q);
		}
		for(int i=0;i<n/2;i++) //it is the range of small
		{
			int id = nod[i].id;
			s[id][0] = 0;
		}
		for(int i=n/2;i<n;i++)
		{
			int id = nod[i].id;
			s[id][mm-1] = 0;
		}
		
		allocate_tickets(s);
		for(int i=0;i<n;i++)
		{
			if(i<n/2)
			{
				a[i] = nod[i].least;
			}
			else
			{
				a[i] = nod[i].maxn;
			}
		}
		sort(a,a+n);
		long long int ans = a[n/2] + a[n/2-1];
		ans /=2;
		for(int i=0;i<n;i++)
		{
			sum += abs(a[i] - ans);
		}
		return sum;
	}
	
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:23:24: warning: control reaches end of non-void function [-Wreturn-type]
   23 |  vector<vector <int> > s;
      |                        ^

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