Submission #815163

#	Time	Username	Problem	Language	Result	Execution time	Memory
815163		JakobZorz	Rarest Insects (IOI22_insects)	C++17	50 / 100	149 ms	544 KiB

insects

#include"insects.h"
#include<iostream>
#include<vector>
#include<set>
using namespace std;

set<int>inside;
int n,distinct;
int low_bound,high_bound;

int c_press_button(){
    return press_button();
}

void c_move_inside(int a){
    inside.insert(a);
    move_inside(a);
}

void c_move_outside(int a){
    inside.erase(a);
    move_outside(a);
}

void check(int c){
    for(int i=0;i<n;i++){
        c_move_inside(i);
        if(c_press_button()>c)
            c_move_outside(i);
    }
    
    bool res=inside.size()==c*distinct;
    
    if(res){
        low_bound=c;
        high_bound=n;
    }else{
        low_bound=0;
        high_bound=c;
    }
    
    vector<int>inside_vec={inside.begin(),inside.end()};
    for(int i:inside_vec)
        c_move_outside(i);
}

int get_distinct(){
    for(int i=0;i<n;i++){
        c_move_inside(i);
        if(c_press_button()>1)
            c_move_outside(i);
    }
    
    int res=inside.size();
    
    vector<int>inside_vec={inside.begin(),inside.end()};
    for(int i:inside_vec)
        c_move_outside(i);
    
    return res;
}

int min_cardinality(int N){
    n=N;
    distinct=get_distinct();
    if(distinct>n/2)
        return 1;
    if(distinct==1)
        return n;
    int l=1,r=n/distinct+1;
    while(l<r-1){
        int m=(l+r)/2;
        check(m);
        l=max(low_bound,l);
        r=min(high_bound,r);
    }
    return l;
}

Compilation message (stderr)

insects.cpp: In function 'void check(int)':
insects.cpp:32:27: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |     bool res=inside.size()==c*distinct;
      |              ~~~~~~~~~~~~~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 25 / 75