Submission #815205

#	Time	Username	Problem	Language	Result	Execution time	Memory
815205		JakobZorz	Rarest Insects (IOI22_insects)	C++17	50 / 100	178 ms	412 KiB

insects

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

vector<bool>inside;
int num_inside;
int n,distinct;
int low_bound,high_bound;

int c_press_button(){
    return press_button();
}

void c_move_inside(int a){
    inside[a]=true;
    num_inside++;
    move_inside(a);
}

void c_move_outside(int a){
    inside[a]=false;
    num_inside--;
    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=num_inside==c*distinct;
    
    if(res){
        low_bound=max(low_bound,c);
        high_bound=min(high_bound,c+(n-c*distinct)/distinct+1);
    }else{
        low_bound=max(low_bound,c-(c*distinct-num_inside));
        high_bound=min(high_bound,c);
    }
    
    vector<int>inside_vec={inside.begin(),inside.end()};
    for(int i=0;i<n;i++)
        if(inside[i])
            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=num_inside;
    
    vector<int>inside_vec={inside.begin(),inside.end()};
    for(int i=0;i<n;i++)
        if(inside[i])
            c_move_outside(i);
    
    return res;
}

int min_cardinality(int N){
    n=N;
    inside.resize(n);
    distinct=get_distinct();
    if(distinct>n/2)
        return 1;
    if(distinct==1)
        return n;
    low_bound=1;
    high_bound=n/distinct+1;
    
    while(low_bound<high_bound-1){
        int m=(low_bound+high_bound)/2;
        check(m);
    }
    return low_bound;
}

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