Submission #134448

#	Time	Username	Problem	Language	Result	Execution time	Memory
134448		arthurconmy	Cave (IOI13_cave)	C++14	51 / 100	142 ms	512 KiB

cave

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

#ifndef ARTHUR_LOCAL
	#include "cave.h"
#endif

#ifdef ARTHUR_LOCAL
	int tryCombination(int an_S[])
	{
		cout << "TRYING: ";
		for(int i=0; i<4; i++) cout << an_S[i] << " ";
		cout << endl;

		int ans=-1;

		if(an_S[0]!=1) ans=3;
		if(an_S[3]!=0) ans=2;
		if(an_S[1]!=1) ans=1;
		if(an_S[2]!=1) ans=0;

		cout << ans << endl;
		return ans;
	}
#endif

void exploreCave(int n)
{
	int D[n]; 
	int S[n];

	for(int i=0; i<n; i++)
	{
		S[i]=0;
		D[i]=0;
	}

	if(n==1)
	{
		if(tryCombination(S)==-1) answer(S,D);
		S[0]=1;
		answer(S,D);
	}

	vector<int> lock(n);

	for(int i=0; i<n; i++)
	{
		int l=0;
		int r=n-1; // door i is controlled by a switch in the range between l and r

		int now=-1;
		int cur=-1;

		bool first_go = false;

		while(l<r)
		{
			// cout << l << " " << r << endl;

			if(first_go)
			{
				cur = tryCombination(S);
				first_go=0;
			}

			else cur = now;

			int cur = tryCombination(S);
			int mid = int((l+r)/2);

			for(int j=l; j<=mid; j++)
			{
				if(!lock[j]) S[j]=1-S[j];
			}

			now = tryCombination(S);

			if(cur==now || (cur!=i && now!=i))
			{
				// cout << cur <<" " << now << " " << i << " " << mid << endl;
				l = mid+1;
			}

			else
			{
				r=mid;
			}
		}

		if(now == i) S[l]=1-S[l];
		lock[l]=1;
		D[l]=i;
	}

	// for(int i=0; i<4; i++)
	// {
	// 	cout << D[i] << " ";
	// }

	answer(S,D);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:53:7: warning: variable 'cur' set but not used [-Wunused-but-set-variable]
   int cur=-1;
       ^~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 0 / 24