Submission #628087

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
628087	2022-08-13 04:50:05	haojiandan	Rarest Insects (IOI22_insects)	C++17	99.89 / 100	62 ms	432 KiB

insects

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#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
int n;
int p[10000];
int min_cardinality(int _n) {
  n=_n; vector<int> V; int cnt=0;
  for (int i=0;i<n;i++) p[i]=i; random_shuffle(p,p+n);
  for (int i=0;i<n;i++) {
    move_inside(p[i]);
    if (press_button()>1) move_outside(p[i]),V.push_back(p[i]); else cnt++;
  }
  if (cnt==1) return n;
  if (cnt==2) {
    for (int i=0;i<n;i++) move_inside(i);
    return n-press_button();
  }
  int l=2,r=n/cnt,mid,res=1;
  int lst=1;
  while (l<=r) {
    mid=(l+r)>>1;
    vector<int> V1,V2; int c=0;
    for (int &x : V) {
      move_inside(x);
      if (press_button()>mid) move_outside(x),V2.push_back(x); else c++,V1.push_back(x);
    }
    if (c==cnt*(mid-lst)) {
      res=mid; V.swap(V2); lst=mid; l=mid+1;
    } else {
      r=mid-1; for (int &x : V1) move_outside(x); V.swap(V1);
 
 
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Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:8:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    8 |  for (int i=0;i<n;i++) p[i]=i; random_shuffle(p,p+n);
      |  ^~~
insects.cpp:8:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    8 |  for (int i=0;i<n;i++) p[i]=i; random_shuffle(p,p+n);
      |                                ^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.89 / 75