Submission #300465

#	Time	Username	Problem	Language	Result	Execution time	Memory
300465		daniel920712	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	842 ms	84104 KiB

tickets

#include "tickets.h"
#include <vector>
#include <algorithm>
using namespace std;
struct A
{
    int where;
    int con;
}tt[1505];

vector < vector < int > > answer;
vector < int > row;
vector< vector<int> >  all;
vector < int > how;
bool have[1505][1505];
bool use[1505]={0};
long long DP[1505][1505];
int a[1505];
int b[1505];
int N,M;
long long F(int here,int con)
{
    if(con>N/2) return -1e18;
    if(here==N&&con!=N/2) return -1e18;
    if(here==N) return 0;
    if(have[here][con]) return DP[here][con];
    have[here][con]=1;
    DP[here][con]=max(F(here+1,con+1)+all[here][M-1],F(here+1,con)-all[here][0]);
    return DP[here][con];
}
void F2(int here,int con)
{
    if(here==N) return;
    //printf("%d %d\n",F(here+1,con+1)+all[here][M-1],F(here+1,con)-all[here][0]);
    if(F(here+1,con+1)+all[here][M-1]>F(here+1,con)-all[here][0])
    {
        //printf("aa\n");
        F2(here+1,con+1);
        answer[here][M-1]=0;
    }
    else
    {
        F2(here+1,con);
        answer[here][0]=0;
    }

}
long long find_maximum(int k,vector< vector<int> > x)
{
    all=x;
	N=x.size();
	M=x[0].size();
	int i,j,l,t,ok,now;
	long long ans=0;
	for(i=0;i<M;i++) row.push_back(-1);
	for(i=0;i<N;i++)
    {
        answer.push_back(row);
        for(j=0;j<M;j++) how.push_back(x[i][j]);
    }
	if(k==1)
    {
        ans=F(0,0);
        F2(0,0);
    }
    else
    {
        sort(how.begin(),how.end());
        for(i=0;i<N*M/2;i++) ans-=how[i];
        for(i=N*M/2;i<N*M;i++) ans+=how[i];
        for(i=0;i<N;i++)
        {
            for(j=0;j<M;j++)
            {
                if(x[i][j]<how[N*M/2]) a[i]++;
                if(x[i][j]>how[N*M/2-1]) b[i]++;
            }
        }
        for(i=0;i<N;i++)
        {
            if(use[i]) continue;
            for(j=i+1;j<N;j++)
            {
                if(b[i]+b[j]>N||a[i]+a[j]>N) continue;
                use[j]=1;
                for(l=0;l<M;l++) answer[i][l]=l;
                for(l=0;l<M;l++) answer[j][l]=M-l-1;
                break;
            }
        }
    }
	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:53:12: warning: unused variable 't' [-Wunused-variable]
   53 |  int i,j,l,t,ok,now;
      |            ^
tickets.cpp:53:14: warning: unused variable 'ok' [-Wunused-variable]
   53 |  int i,j,l,t,ok,now;
      |              ^~
tickets.cpp:53:17: warning: unused variable 'now' [-Wunused-variable]
   53 |  int i,j,l,t,ok,now;
      |                 ^~~

• 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