Submission #962897

#	Time	Username	Problem	Language	Result	Execution time	Memory
962897		raspy	Cave (IOI13_cave)	C++14	100 / 100	471 ms	812 KiB

cave

#include "cave.h"
#include <iostream>

using namespace std;

int s[5005];
int rs[5005];
int cn[5005];

void exploreCave(int n)
{
	int lg = 0;
	while ((1<<lg) < n)
		lg++;
	// cout << n << " " << lg << "\n";
	for (int i = 0; i < n; i++)
		rs[i] = -1;
	for (int tr = 0; tr < n; tr++)
	{
		// cout << "-> " << tr << "\n";
		int ixn = 0;
		for (int j = 0; j < lg; j++)
		{
			// cout << "   ";
			for (int i = 0; i < n; i++)
			{
				s[i] = (i&(1<<j) ? 1 : 0);
				if (rs[i] != -1)
					s[i] = rs[i];
				// cout << s[i] << " ";
			}
			// cout << "\n";
			int odg =  tryCombination(s)-1;
			if (odg == -2)
				odg = n-1;
			// cout << "\t" << odg << "\n";
			if (odg >= tr)
			{
				// cout << "\ttest" << "\n";
				ixn |= (1<<j);
			}
		}
		int ix = 0;
		for (int j = 0; j < lg; j++)
			if (!(ixn & (1<<j)))
				ix |= (1<<j);
		for (int i = 0; i < n; i++)
		{
			s[i] = 0;
			if (rs[i] != -1)
				s[i] = rs[i];
		}
		if (ixn < n)
			s[ixn] = 1;
		if (ix < n && rs[ix] == -1)
			s[ix] = 1;
		int odg = tryCombination(s)-1;
		if (odg == -2)
			odg = n-1;
		// cout << "-> " << tr << " <> " << odg << ", " << ixn << "\n";
		if (odg >= tr)
		{
			// cout << ixn << " " << tr << "\n";
			cn[ixn] = tr;
			rs[ixn] = 1;
		}
		else
		{
			cn[ix] = tr;
			rs[ix] = 0;
		}
	}
	answer(rs, cn);
}

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