Submission #145313

#	Time	Username	Problem	Language	Result	Execution time	Memory
145313		MKopchev	popa (BOI18_popa)	C++14	0 / 100	35 ms	588 KiB

popa

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

stack<int> open,idle;

int n_,in_;
int ask(int a,int b,int c,int d)
{
    while(a>b);
    while(c>d);
    in_++;
    return query(a,b,c,d);
}
int solve(int N, int* Left, int* Right)
{
    n_=N;
    in_=0;
    for(int i=0;i<N;i++)Left[i]=0,Right[i]=0;

    open=idle;

    Left[0]=-1;
    open.push(0);
    for(int i=1;i<N;i++)
    {
        int prev=-1;
        while(open.size()&&ask(open.top(),i,i,i))
        {
            prev=open.top();
            open.pop();
        }

        Left[i]=prev;
        open.push(i);
    }

    int prev=-1;
    while(open.size())
    {
        Right[open.top()]=prev;
        prev=open.top();
        open.pop();
    }

    open=idle;
    Right[N-1]=-1;
    open.push(N-1);
    for(int i=N-2;i>=0;i--)
    {
        int prev=-1;

        if(Right[i])
        {
            while(open.top()!=Right[i])
                open.pop();
            prev=Right[i];
        }
        else
        while(open.size()&&Left[open.top()]!=i&&ask(i,open.top(),i,i))
        {
            prev=open.top();
            open.pop();
        }

        Right[i]=prev;
        open.push(i);
    }

    set<int> seen={};
    for(int i=0;i<N;i++)
    {
        seen.insert(Left[i]);
        seen.insert(Right[i]);
    }

    assert(in_<=3*N);

    for(int i=0;i<N;i++)
        if(seen.count(i)==0)return i;
    assert(0==1);
}

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