Submission #978467

#	Time	Username	Problem	Language	Result	Execution time	Memory
978467		alexdd	popa (BOI18_popa)	C++17	61 / 100	82 ms	1580 KiB

popa

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

map<pair<pair<int,int>,pair<int,int>>,int> mp;
int myquery(int a, int b, int c, int d)
{
    if(a==c && b==d)
        return 1;
    int na=min(a,b),nb=max(a,b),nc=min(c,d),nd=max(c,d);
    if(make_pair(na,nb) < make_pair(nc,nd))
    {
        swap(na,nc);
        swap(nb,nd);
    }
    if(mp[{{na,nb},{nc,nd}}]==0) mp[{{na,nb},{nc,nd}}] = query(na,nb,nc,nd)+1;
    return mp[{{na,nb},{nc,nd}}]-1;
}
int limle[1005];
void precalc(int N)
{
    limle[0]=0;
    for(int i=1;i<N;i++)
    {
        if(myquery(i-1,i,i,i))
        {
            limle[i] = limle[i-1];
            while(limle[i]>0 && (limle[limle[i]]!=limle[i] || myquery(limle[i]-1,i,i,i)))
                limle[i]--;
        }
        else
        {
            limle[i]=i;
        }
    }
}
int tole[1005],tori[1005];
int calc(int le, int ri)
{
    if(le>ri)
        return -1;
    if(le==ri)
    {
        tole[le]=tori[le]=-1;
        return le;
    }
    for(int root=ri;root>=le;root--)
    {
        if(limle[root]<=le)
        {
            tole[root] = calc(le,root-1);
            tori[root] = calc(root+1,ri);
            return root;
        }
    }
    return -5;
}
int solve(int N, int* Left, int* Right)
{
    mp.clear();
    precalc(N);
    for(int i=0;i<N;i++)
        tole[i]=tori[i]=-1;
    int root = calc(0,N-1);
    for(int i=0;i<N;i++)
    {
        Left[i]=tole[i];
        Right[i]=tori[i];
    }
    return root;
}

• Subtask 1: 37 / 37
• Subtask 2: 24 / 24
• Subtask 3: 0 / 39