Submission #1238857

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238857		k1r1t0	드문 곤충 (IOI22_insects)	C++20	100 / 100	14 ms	432 KiB

insects

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

void move_inside(int i);
void move_outside(int i);
int press_button();

const int NN = 2100;

bool inside[NN], cant[NN];

int min_cardinality(int N) {
	vector<int> ord;
	for (int i = 0; i < N; i++)
		ord.push_back(i);
	for (int i = 0; i < N; i++)
		inside[i] = false;
	int cnt = 0;
	vector<int> cur;
	random_shuffle(begin(ord), end(ord));
	for (int i : ord) {
		move_inside(i);
		cnt++;
		inside[i] = true;
		cur.push_back(i);
		int ans = press_button();
		if (ans > 1) {
			move_outside(i);
			cnt--;
			inside[i] = false;
			cur.pop_back();
		}
	}
	int tt = cnt;
	int l = 1, r = N / cnt;
	while (l < r) {
		int mid = (l + l + r) / 3 + 1;
		int old = tt;
		random_shuffle(begin(ord), end(ord));
		vector<int> rr;
		for (int i : ord) {
			if (tt == cnt * mid) break;
			if (inside[i]) continue;
			if (cant[i]) continue;
			move_inside(i);
			tt++;
			inside[i] = true;
			cur.push_back(i);
			int ans = press_button();
			if (ans > mid) {
				cant[i] = true;
				rr.push_back(i);
				move_outside(i);
				tt--;
				inside[i] = false;
				cur.pop_back();
			}
		}
		if (tt == cnt * mid) {
			l = mid;
			for (int x : rr)
				cant[x] = false;
		} else {
			r = min(tt / cnt, mid - 1);
			if (l != r) {
				while (tt != old) {
					int x = cur.back();
					move_outside(x);
					tt--;
					inside[x] = false;
					cur.pop_back();
				}
			}
		}
	}
	return l;
}















/*
static inline constexpr int kMaxQueries = 40000;

static int N;
// Insect types are compressed to colors in the range [0, N).
static std::vector<int> color;
static std::vector<bool> in_box;

static std::vector<int> color_occurrences;
static std::multiset<int> max_occurrences;

static std::vector<int> op_counter(3, 0);

static inline void protocol_violation(std::string message) {
  printf("Protocol Violation: %s\n", message.c_str());
  exit(0);
}

void move_inside(int i) {
  if (i < 0 || i >= N) {
    protocol_violation("invalid parameter");
  }
  ++op_counter[0];
  if (op_counter[0] > kMaxQueries) {
    protocol_violation("too many calls");
  }
  if (!in_box[i]) {
    in_box[i] = true;
    max_occurrences.erase(max_occurrences.find(color_occurrences[color[i]]));
    ++color_occurrences[color[i]];
    max_occurrences.insert(color_occurrences[color[i]]);
  }
}

void move_outside(int i) {
  if (i < 0 || i >= N) {
    protocol_violation("invalid parameter");
  }
  ++op_counter[1];
  if (op_counter[1] > kMaxQueries) {
    protocol_violation("too many calls");
  }
  if (in_box[i]) {
    in_box[i] = false;
    max_occurrences.erase(max_occurrences.find(color_occurrences[color[i]]));
    --color_occurrences[color[i]];
    max_occurrences.insert(color_occurrences[color[i]]);
  }
}

int press_button() {
  ++op_counter[2];
  if (op_counter[2] > kMaxQueries) {
    protocol_violation("too many calls");
  }
  return *(max_occurrences.rbegin());
}

int main() {
  assert(1 == scanf("%d", &N));
  color.resize(N);
  in_box.assign(N, false);

  std::map<int, int> type_to_color;
  for (int i = 0; i < N; ++i) {
    int Ti;
    assert(1 == scanf("%d", &Ti));
    if (type_to_color.find(Ti) == type_to_color.end()) {
      int new_color = type_to_color.size();
      type_to_color[Ti] = new_color;
      max_occurrences.insert(0);
    }
    color[i] = type_to_color[Ti];
  }

  color_occurrences.assign(type_to_color.size(), 0);

  int answer = min_cardinality(N);
  int Q = *std::max_element(op_counter.begin(), op_counter.end());
  printf("%d\n", answer);
  printf("%d\n", Q);
  return 0;
}
//*/

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