Submission #107447

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
107447	2019-04-24 12:15:07	DodgeBallMan	Cave (IOI13_cave)	C++14	100 / 100	313 ms	536 KiB

cave

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#include "cave.h"
#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 5e3+5; 
 
int S[N], D[N];
bool chk[N];
 
void exploreCave( int n) {
  for( int i = 0; i < n; i++ ) {
    int init = tryCombination( S );
    bool t = ( init == -1 || init > i );
    int l = 0, r = n - 1;
    while( l < r ) {
      int m = ( l + r ) >> 1;
      for( int j = l ; j <= m ; j++ ) if( !chk[j] ) S[j] ^= 1;
      int ret = tryCombination( S );
      bool now = ( ret == -1 || ret > i );
      if( t ^ now ) r = m, t = now;
      else l = m + 1;
    }
    if( !t ) S[r] ^= 1;
    D[r] = i, chk[r] = true;
  }
  answer( S, D );
}
 
 
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