제출 #718912

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
718912		baojiaopisu	드문 곤충 (IOI22_insects)	C++17	0 / 100	1 ms	208 KiB

insects

#include "insects.h"

#include <cassert>
#include <cstdio>

#include <algorithm>
#include <map>
#include <set>
#include <string>
#include <vector>
using namespace std;
#define pb push_back

int min_cardinality(int n) {
  freopen("output.txt", "w", stdout);
  vector<int> curr;
  for(int i = 0; i < n; i++) {
    move_inside(i);
    int x = press_button();
    if(x > 1) move_outside(i);
    else curr.pb(i);
  }

  int num = curr.size();
  int l = 1, r = n / curr.size();
  for(auto x : curr) move_outside(x);
  curr.clear();
  
  vector<int> q;
  for(int i = 0; i < n; i++) q.pb(i);
  int d = 0, ans = 0; 
  while(l <= r) {
    int mid = (l + r) >> 1;
    vector<int> nxt_q;
    vector<int> cc = curr;
    vector<int> t;

    int cnt = 0;
    for(int i = 0; i < q.size(); i++) {
      move_inside(q[i]);
      int x = press_button();
      if(x > mid) move_outside(q[i]), nxt_q.pb(q[i]);
      else curr.pb(q[i]), t.pb(q[i]), ++cnt;
    }

    if(cnt == (mid - d) * num) {
      d = mid;
      curr.clear();
      q = nxt_q;
      ans = mid;
      l = mid + 1;
    } else {
      for(auto x : t) move_outside(x);
      curr = cc;
      q = t;
      r = mid - 1;
    }
  }

  return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for(int i = 0; i < q.size(); i++) {
      |                    ~~^~~~~~~~~~
insects.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   freopen("output.txt", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75