Submission #836142

#	Time	Username	Problem	Language	Result	Execution time	Memory
836142		unnick	Minerals (JOI19_minerals)	C++14	40 / 100	13 ms	1744 KiB

minerals

#include "minerals.h"

#include <vector>

using namespace std;

void Solve(int N) {
  vector<int> fst;
  vector<int> snd;
  int prev = 0;
  for (int i = 1; i <= N*2; i++) {
    int tmp = Query(i);
    if (tmp > prev) fst.push_back(i);
    prev = tmp;
  }
  for (int i = 1; i <= N*2; i++) {
    int tmp = Query(i);
    if (tmp < prev) snd.push_back(i);
    prev = tmp;
  }

  int baseline;
  for (int i = 0; i < N; i++) {
    if (i&1) baseline = Query(fst[i]);
  }
  vector<int> ids(N, 0);
  for (int pd = 1; pd < N; pd <<= 1) {
    if (pd > 1) {
      for (int i = 0; i < N; i++) {
        if ((i&pd) ^ ((i<<1)&pd)) baseline = Query(fst[i]);
      }
    }
    for (int i = 0; i < N; i++) {
      int bit = !(Query(snd[i]) - baseline);
      ids[i] += bit * pd;
      Query(snd[i]);
    }
  }
  for (int i = 0; i < N; i++) {
    Answer(fst[ids[i]], snd[i]);
  }
}

Compilation message (stderr)

minerals.cpp: In function 'void Solve(int)':
minerals.cpp:34:17: warning: 'baseline' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |       int bit = !(Query(snd[i]) - baseline);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 0 / 30
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10