Submission #105202

#	Time	Username	Problem	Language	Result	Execution time	Memory
105202		ly20	Cave (IOI13_cave)	C++14	100 / 100	506 ms	512 KiB

cave

#include<bits/stdc++.h>
#include "cave.h"

void exploreCave(int n)
{
	int est[n],ord[n],resp[n];
	for(int i=0;i<n;i++)
	{
		est[i]=0;
		ord[i]=-1;
		resp[i]=0;
	}
	if(n==1)
	{
		int k=tryCombination(est);
		if(k==0)est[0]=1;
		ord[0]=0;
		answer(est,ord);
	}
	for(int at=0;at<n;at++)
	{
		int ini=0,fim=n-1;
		int k=tryCombination(est);
		while(ini<fim)
		{
			if(k>at || k==-1)
			{
				for(int i=ini;i<=fim;i++)if(ord[i]==-1)est[i]=1-est[i];
			}
			int m=(ini+fim)/2;
			for(int i=ini;i<=m;i++)if(ord[i]==-1)est[i]=1-est[i];
			k=tryCombination(est);
			if(k>at || k==-1)fim=m;
			else ini=m+1;
			if(k<=at && k>=0)
			{
				for(int i=ini;i<=fim;i++)if(ord[i]==-1)est[i]=1-est[i];
				k=at+1;
			}
		}
		ord[ini]=at;
		resp[ini]=est[ini];
	}
	answer(resp,ord);
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24