Submission #102932

#	Time	Username	Problem	Language	Result	Execution time	Memory
102932		wxh010910	Cave (IOI13_cave)	C++17	100 / 100	339 ms	616 KiB

cave

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

using namespace std;

void exploreCave(int N) {
  int* S = new int[N];
  int* D = new int[N];
  for (int i = 0; i < N; ++i) {
    S[i] = 0;
  }
  vector<bool> done(N);
  for (int i = 0; i < N; ++i) {
    int last = tryCombination(S);
    int l = 0, r = N - 1;
    while (l < r) {
      int mid = (l + r) >> 1;
      for (int i = l; i <= mid; ++i) {
        if (!done[i]) {
          S[i] = !S[i];
        }
      }
      int now = tryCombination(S);
      if ((last == i) == (now == i)) {
        l = mid + 1;
      } else {
        r = mid;
      }
      last = now;
    }
    if (last == i) {
      S[r] = !S[r];
    }
    D[r] = i;
    done[r] = true;
  }
  answer(S, D);
}

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