Submission #629368

#	Time	Username	Problem	Language	Result	Execution time	Memory
629368		dacin21	Rarest Insects (IOI22_insects)	C++17	100 / 100	67 ms	464 KiB

insects

#include "insects.h"

/*
void move_inside(int i);
void move_outside(int i);
int press_button();
*/
#include <bits/stdc++.h>
using namespace std;


vector<int> in, out;


void one_pass(vector<int> pool, int tr){
    in.clear();
    out.clear();
    for(auto &e : pool){
        move_inside(e);
        if(press_button() > tr){
            move_outside(e);
            out.push_back(e);
        } else {
            in.push_back(e);
        }
    }
    for(auto &e : in){
        move_outside(e);
    }
}

int min_cardinality(int n) {
    vector<int> all(n);
    iota(all.begin(), all.end(), 0);
    one_pass(all, 1);

    const int B = in.size();
    int ans = 1;
    all = out;
    while(all.size() >= B){
        const int l = 0, r = all.size()/B;
        // const int t = (all.size() / B + 1) / 2;
        const int t = (l+r+1+(2*(all.size()%B) >= B))/2;
        one_pass(all, t);
        if(in.size() == t*B){
            ans += t;
            all = out;
        } else {
            all = in;
        }
    }
    return ans;

}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:40:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
   40 |     while(all.size() >= B){
      |           ~~~~~~~~~~~^~~~
insects.cpp:43:48: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
   43 |         const int t = (l+r+1+(2*(all.size()%B) >= B))/2;
      |                               ~~~~~~~~~~~~~~~~~^~~~
insects.cpp:45:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |         if(in.size() == t*B){
      |            ~~~~~~~~~~^~~~~~

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