Submission #871600

#	Time	Username	Problem	Language	Result	Execution time	Memory
871600		vjudge1	Cave (IOI13_cave)	C++17	100 / 100	187 ms	600 KiB

cave

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

void
exploreCave (int n)
{
  /// full task
  int s = -2;
  vector < int > a (n), b (n, -1);
  for (int i = 0; i < n; ++i)
    {
      if (s == -2) s = tryCombination (&a[0]);
      int l = 0, r = n;
      while (l < r)
        {
          if (l + 1 == r) break;
          int m = (l + r) / 2;
          for (int j = l; j < m; ++j)
            if (b[j] == -1)
              a[j] = !a[j];
          int t = tryCombination (&a[0]);
          for (int j = l; j < m; ++j)
            if (b[j] == -1)
              a[j] = !a[j];
          if ((s == i && (t > i || t == -1))
              || ((s > i || s == -1) && t == i))
            r = m;
          else
            l = m;
        }
      b[l] = i;
      if (s == i) a[l] = !a[l], s = -2;
    }
  answer (&a[0], &b[0]);
}

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