Submission #742646

#	Time	Username	Problem	Language	Result	Execution time	Memory
742646		doowey	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	248 ms	524 KiB

insects

#include <bits/stdc++.h>
#include "insects.h"

using namespace std;

typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair

int min_cardinality(int n) {
    int val;
    vector<int> in;
    for(int i = 0 ; i < n; i ++ ){
        move_inside(i);
        val = press_button();
        if(val > 1){
            move_outside(i);
        }
        else{
            in.push_back(i);
        }
    }
    int dist = in.size();
    int l = 1;
    int r = n + 1;
    int mid;
    while(l + 1 < r){
        mid = (l + r) / 2;
        if(mid * dist > n){
            r = mid;
            continue;
        }
        for(auto x : in){
            move_outside(x);
        }
        in.clear();
        for(int i = 0 ; i < n; i ++ ){
            move_inside(i);
            val = press_button();
            if(val > mid){
                move_outside(i);
            }
            else{
                in.push_back(i);
            }
        }
        if(in.size() == mid * dist){
            l = mid;
        }
        else{
            r = mid;
        }
    }
    return l;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:49:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   49 |         if(in.size() == mid * dist){
      |            ~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 22.5 / 75