Submission #254805

#	Time	Username	Problem	Language	Result	Execution time	Memory
254805		MKopchev	Last supper (IOI12_supper)	C++14	0 / 100	170 ms	44528 KiB

advisor

#include "advisor.h"
#include<bits/stdc++.h>
using namespace std;

const int nmax=2e5+42;

int pointer=0;
unsigned char ad[nmax];

int seen[nmax];

int nxt_seen[nmax];

set< pair<int/*seen next*/,int/*id*/> > s;

int when_pushed[nmax];


set<int> cut_moment[nmax];

vector<int> there[nmax];

int check_next_moment(int pos,int after)
{
    if(there[pos].size()==0)return 0;

    int p=upper_bound(there[pos].begin(),there[pos].end(),after)-there[pos].begin();

    if(p==there[pos].size())return 0;

    if(cut_moment[pos].count(there[pos][p]))return 0;

    return 1;
}
void ComputeAdvice(int *C,int N,int K,int M)
{
	for(int i=0;i<N;i++)
        seen[i]=N;

    for(int i=N-1;i>=0;i--)
    {
        nxt_seen[i]=seen[C[i]];
        seen[C[i]]=i;
    }

    for(int i=0;i<K;i++)
        s.insert({nxt_seen[i],i});

    for(int i=0;i<K;i++)
        if(s.count({i,C[i]}))
        {
            s.erase({i,C[i]});
            s.insert({nxt_seen[i],C[i]});
        }
        else
        {
            //cut the furthest
            set< pair<int/*seen next*/,int/*id*/> >::iterator it=s.end();
            it--;

            int which=(*it).second;

            cut_moment[which].insert(i);

            when_pushed[C[i]]=i;

            s.erase(it);

            s.insert({nxt_seen[i],C[i]});
        }

    for(int i=0;i<N;i++)
        there[C[i]].push_back(i);

    for(int i=0;i<K;i++)
        WriteAdvice(check_next_moment(i,-1));

    for(int i=0;i<N;i++)
        WriteAdvice(check_next_moment(C[i],i));
}

assistant

#include "assistant.h"
#include<bits/stdc++.h>
using namespace std;

const int nmax=2e5+42;

set<int> active,passive;

void Assist(unsigned char *A, int N, int K, int R)
{
    for(int i=0;i<K;i++)
        if(A[i]==1)active.insert(i);
        else passive.insert(i);

    for(int i=K;i<N+K;i++)
    {
        int cur=GetRequest();

        if(active.count(cur))
        {
            active.erase(cur);
        }
        else if(passive.size())
        {
            int tp=*passive.begin();
            passive.erase(tp);
            PutBack(tp);
        }
        else
        {
            int tp=*active.begin();
            active.erase(tp);
            PutBack(tp);
        }

        if(A[i]==1)active.insert(cur);
        else passive.insert(cur);
    }
}

Compilation message (stderr)

advisor.cpp: In function 'int check_next_moment(int, int)':
advisor.cpp:29:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(p==there[pos].size())return 0;
        ~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 35
• Subtask 5: 0 / 39