Submission #919758

#	Time	Username	Problem	Language	Result	Execution time	Memory
919758		Cutebol	Cave (IOI13_cave)	C++17	100 / 100	221 ms	1024 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
using namespace std ;
const int Ne = 5005 ;
#define go tryCombination
int a[Ne] , b[Ne] , c[Ne] , vis[Ne] ;
int n ;
vector <int> vec ;

void rec ( vector <int> ind , int cur ){
	if ( ind.size() == 1 ){
		a[ind[0]] = 1 ;
		int x = go(a) ;
		if ( (x != cur && b[cur] == 1) || (x == cur && b[cur] == 0) )
			c[cur] = ind[0] , vis[ind[0]] = cur , a[ind[0]] = b[cur] ;
		return ;
	}
	int mid = ind.size() / 2 ;
	for ( int i = 0 ; i < mid ; i ++ ) a[ind[i]] = 1 ;
	int x = go(a) ;
	for ( int i = 0 ; i < mid ; i ++ ) a[ind[i]] = 0 ;
	vector <int> v ;
	if ( (x != cur && b[cur] == 1) || (x == cur && b[cur] == 0) )
		for ( int i = 0 ; i < mid ; i ++ ) v.push_back(ind[i]) ;
	else for ( int i = mid ; i < (int)ind.size() ; i ++ ) v.push_back(ind[i]) ;
	rec( v , cur ) ;
}

void exploreCave(int N) {
    n = N ;
    for ( int i = 0 ; i < n ; i ++ ) vis[i] = -1 ;
    for ( int i = 0 ; i < n ; i ++ ) vec.push_back(i) ;
    int x = go(a) ;
    if ( x == 0 ) b[0] = 1 ;
    rec (vec , 0 ) ;
    for ( int i = 1 ; i < n ; i ++ ){
		vec.clear() ;
		for ( int j = 0 ; j < n ; j ++ ){
			if ( vis[j] == -1 ) vec.push_back(j) , a[j] = 0 ;
			else a[j] = b[vis[j]] ;
		}
		x = go(a) ;
		if ( x == i ) b[i] = 1 ;
		rec(vec,i) ;
	}
	for ( int i = 0 ; i < n ; i ++ ) c[i] = b[vis[i]] ;
	answer ( c , vis ) ;
}

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