Submission #845014

#	Time	Username	Problem	Language	Result	Execution time	Memory
845014		midi	Cave (IOI13_cave)	C++14	13 / 100	14 ms	556 KiB

cave

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

typedef long long ll;
#define vc vector
typedef vc<ll> vcll;
#define pr pair
typedef pr<ll, ll> prll;

#define f0r(i,a,n) for (i=a; i<n; i++)
#define f1r(i,a,n) for (i=a; i<=n; i++)
#define r0f(i,n,a) for (i=n; i>a; i--)
#define r1f(i,n,a) for (i=n; i>=a; i--)

#define pb push_back
#define mp make_pair

#define INF (LLONG_MAX>>4ll)
#define mxN 5010ll

ll n;
int bar[mxN];
int gar[mxN];
int perm[mxN];

void exploreCave(int N)
{
	n=N;

	ll i2;

	f0r(i2,0,n)
	{
		bar[i2]=0;
		perm[i2]=-1;
		gar[i2]=-1;
	}

	f0r(i2,0,n)
	{
		ll i3;
		f0r(i3, 0, n) if (gar[i3]==-1) bar[i3]=0;
		ll i = tryCombination(bar);

		/*
		// printf("try combination(");
		f0r(i3,0,n) printf("%lli ", (ll)bar[i3]);
		printf("): ");
		scanf("%lli", &i);
		*/

		if (i==-1) break;

		ll j;
		ll l=0, r=n-1; // both incl.

		bool broke=0;

		while (l<r)
		{
			ll m;
			m = ((l+1==r) ? l : (l+r)/2);
			// printf("l: %lli, m: %lli, r: %lli\n", l, m, r);
			f1r(i3, l, m) if (gar[i3]==-1) bar[i3]^=1;

			j = tryCombination(bar);

			/*
			printf("try combination(");
			f0r(i3,0,n) printf("%lli ", (ll)bar[i3]);
			printf("): ");
			scanf("%lli", &j);
			*/

			if (j==-1)
			{
				broke=1;
				break;
			}

			if (j<i)
			{
				i=j;
				r=m;
			}
			else if (j==i)
			{
				l=m+1;
			}
			else
			{
				f1r(i3, l, m) if (gar[i3]==-1) bar[i3]!=bar[i3];
				l=m+1;
			}
		}

		if (broke) break;

		bar[l]^=1;
		gar[l]=bar[l];
		// printf("gar[%lli]: %lli\n", l, (ll)gar[l]);
		perm[l]=i;
		// printf("perm[%lli]: %lli\n", l, (ll)perm[l]);
		// printf("\n");
	}

	f0r(i2,0,n)
	{
		gar[i2]=bar[i2];
		bar[i2]^=1;

		ll i;
		i = tryCombination(bar);

		/*
		printf("try combination(");
		ll i3;
		f0r(i3,0,n) printf("%lli ", (ll)bar[i3]);
		printf("): ");
		scanf("%lli", &i);
		*/

		bar[i2]^=1;
		perm[i2]=i;
	}

	// ll i;
	// f0r(i,0,n) printf("gar[%lli]: %lli, perm[%lli]: %lli\n", i, (ll)gar[i], i, (ll)perm[i]);

	answer(gar, perm);
}

/*
int main()
{
	ll N;
	printf("n: ");
	scanf("%lli", &N);
	printf("\n");

	exploreCave(N);

	return 0;
}
*/

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:93:43: warning: self-comparison always evaluates to false [-Wtautological-compare]
   93 |     f1r(i3, l, m) if (gar[i3]==-1) bar[i3]!=bar[i3];
      |                                    ~~~~~~~^~~~~~~~~
cave.cpp:93:43: warning: statement has no effect [-Wunused-value]
   93 |     f1r(i3, l, m) if (gar[i3]==-1) bar[i3]!=bar[i3];
      |                                    ~~~~~~~^~~~~~~~~

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