Submission #1174868

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1174868	2025-03-27 13:44:25	trvhung	Cave (IOI13_cave)	C++20	100 / 100	171 ms	508 KiB

cave

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#include "cave.h"
void exploreCave(int N) {
  int sw[N], fx[N], ofSw[N];
  for (int i = 0; i < N; ++i)
    fx[i] = -1;
  for (int d = 0; d < N; ++d) {
    for (int i = 0; i < N; ++i)
      sw[i] = fx[i] == -1 ? 0 : fx[i];
    int cur = (tryCombination(sw) == d);
    int l = 0, r = N - 1;
    while (l != r) {
      int mid = (l + r) >> 1;
      for (int i = l; i <= mid; ++i)
        sw[i] = fx[i] == -1 ? 1 : fx[i];
      int ask = (tryCombination(sw) == d);
      for (int i = l; i <= mid; ++i)
        sw[i] = fx[i] == -1 ? 0 : fx[i];
    
      if (ask == cur) 
        l = mid + 1;
      else
        r = mid;
    }
    fx[l] = cur;
    ofSw[l] = d;
 
 
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• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24