Submission #1236294

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236294		rxlfd314	Rarest Insects (IOI22_insects)	C++20	61.05 / 100	39 ms	464 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ari2 = array<int, 2>;
using ari3 = array<int, 3>;
using arl2 = array<ll, 2>;
using arl3 = array<ll, 3>;
template <class T> using vt = vector<T>;
#define all(x) begin(x), end(x)
#define size(x) (int((x).size()))
#define REP(a,b,c,d) for(int a=(b);(d)>0?a<=(c):a>=(c);a+=(d))
#define FOR(a,b,c) REP(a,b,c,1)
#define ROF(a,b,c) REP(a,b,c,-1)

int min_cardinality(int N) {
  vt<int> A, B;
  move_inside(0);
  A.push_back(0);
  FOR(i, 1, N-1) {
    move_inside(i);
    if (press_button() == 1) {
      A.push_back(i);
    } else {
      move_outside(i);
      B.push_back(i);
    }
  }
  int ret = N;
  const auto dnc = [&](auto &&self, const vt<int> &Q, const vt<int> &R, bool in) -> void {
    if (size(Q) == 1) {
      ret = min(ret, size(R) + 1);
      return;
    }
    if (in) {
      FOR(i, size(Q)/2, size(Q)-1)
        move_outside(Q[i]);
    } else {
      FOR(i, size(Q)/2, size(Q)-1)
        move_inside(Q[i]);
    }
    vt<int> lft, rht;
    for (const auto &i : R) {
      move_inside(i);
      const int v = press_button();
      (v > 1 && in || v == 1 && !in ? lft : rht).push_back(i);
      move_outside(i);
    }
    self(self, vt<int>(Q.begin(), Q.begin() + size(Q) / 2), lft, in);
    self(self, vt<int>(Q.begin() + size(Q) / 2, Q.end()), rht, !in);
  };
  dnc(dnc, A, B, true);
  return ret;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 36.05 / 75