oj.uz

Submission #686640

# Submission time Handle Problem Language Result Execution time Memory
686640 2023-01-25T15:47:32 Z null_awe Colors (BOI20_colors) C++14
0 / 100
 1 ms 208 KB 
#include <iostream>
#include <set>
using namespace std;

#define int long long

int n, at;
set<int> s;

bool qry(int x) {
  if (at + x <= n) at += x;
  else at -= x;
  if (s.count(at)) exit(0);
  cout << "? " << at << endl;
  s.insert(at);
  bool ans; cin >> ans;
  return ans;
}

int32_t main() {
  cin >> n;
  bool added = true;
  int left = n;
  at = 1;
  for (int i = (left + 1) / 2; i > 0; left >>= 1, i = (left + 1) / 2) {
    if (!added) at += i;
    added = !added;
    if (i == 1) break;
  }
  cout << "? " << at << endl;
  int tmp; cin >> tmp;
  s.insert(at);
  int sum = 0;
  left = n;
  for (int i = (left + 1) / 2; i > 0; left >>= 1, i = (left + 1) / 2) {
    int chg = sum + i;
    if (chg >= n) continue;
    if (!qry(chg)) sum = chg;
  }
  cout << "= " << sum + 1 << '\n';
  return 0;
}

/*
49
25
12
6
3
2
1
*/

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Correct 0 ms 208 KB OK (7 queries)
3 Incorrect 1 ms 208 KB Unexpected end of file - token expected
4 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Correct 0 ms 208 KB OK (7 queries)
3 Incorrect 1 ms 208 KB Unexpected end of file - token expected
4 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Correct 0 ms 208 KB OK (7 queries)
3 Incorrect 1 ms 208 KB Unexpected end of file - token expected
4 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Correct 0 ms 208 KB OK (7 queries)
3 Incorrect 1 ms 208 KB Unexpected end of file - token expected
4 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Correct 0 ms 208 KB OK (7 queries)
3 Incorrect 1 ms 208 KB Unexpected end of file - token expected
4 Halted 0 ms 0 KB -