Submission #300256

#	Time	Username	Problem	Language	Result	Execution time	Memory
300256		daniel920712	Carnival Tickets (IOI20_tickets)	C++14	11 / 100	2 ms	768 KiB

tickets

#include "tickets.h"
#include <vector>
#include <algorithm>
using namespace std;
vector < int > all;
struct A
{
    int where;
    int con;
}tt[1505];
bool F(A a,A b)
{
    return a.con<b.con;
}
vector < vector < int > > answer;
vector < int > row;
long long find_maximum(int k,vector< vector<int> > x)
{
	int n=x.size();
	int m=x[0].size();
	int i,j,t;
	long long ans=0;
	for(i=0;i<m;i++) row.push_back(-1);
	for(i=0;i<n;i++) answer.push_back(row);
	if(m==1)
    {
        for(int i=0;i<n;i++)
        {
            answer[i][0]=0;
            all.push_back(x[i][0]);
        }
        sort(all.begin(),all.end());
        for(i=0;i<n;i++) ans+=abs(all[i]-all[n/2]);
    }
    else
    {
        for(i=0;i<n;i++)
        {
            tt[i].where=i;
            for(j=0;j<m;j++) if(x[i][j]==1) break;
            tt[i].con=j;
        }
        sort(tt,tt+n,F);
        for(i=0;i<n/2;i++)
        {
            for(j=0;j<k;j++)
            {
                if(j%2==0) t=j/2;
                else t=m-1-t/2;
                ans+=x[tt[2*i].where][t]^x[tt[2*i+1].where][t];
                answer[tt[2*i].where][t]=j;
                answer[tt[2*i+1].where][t]=j;
            }
        }
    }

	allocate_tickets(answer);
	return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:49:29: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |                 else t=m-1-t/2;
      |                            ~^~

• 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