Submission #30027

#	Time	Username	Problem	Language	Result	Execution time	Memory
30027		kavun	Cave (IOI13_cave)	C++14	100 / 100	418 ms	640 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;
int s[5010], d[5010], n;
bool mk[5010];

void change(int lo, int hi)
{
  int m = (lo + hi)/2;
  for(int i = lo; i <= m;i++)
    if(!mk[i])
      s[i] ^= 1;
}


void exploreCave(int N) {
  n = N;

  for(int i = 0; i < N; i++)
    {
      int lo = 0, hi = n-1;
      int ps = tryCombination(s);
      int open = i < ps || ps == -1 ? 0 : 1;
      int after;
      while(lo != hi)
	{
	  int m = (lo + hi) / 2;
	  change(lo,hi);
	  int pos = tryCombination(s);
	  after = i < pos || pos == -1 ? 0 : 1;
	  change(lo,hi);
	  if(open != after)
	    hi = m;
	  else
	    lo = m+1;
	}
      mk[lo] = true;
      s[lo] = open;
      d[lo] = i;
    }
  answer(s,d);
}

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