Submission #1069926

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069926		AdamGS	Rarest Insects (IOI22_insects)	C++17	100 / 100	42 ms	960 KiB

insects

#include "insects.h"
#include<bits/stdc++.h>
using namespace std;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
vector<int>V, usun, Q;
int n, m;
int solve(int l, int r, vector<int>czy) {
	if(l==r) return l;
	int mid=(l+r+1)/2;
	vector<int>A, B;
	rep(i, n) if(czy[i]) {
		move_inside(Q[i]);
		++m;
		if(press_button()>mid) {
			A.pb(i);
			move_outside(Q[i]);
			--m;
		} else B.pb(i);
		if(m==mid*V.size()) break;
	}
	if(m==mid*V.size()) {
		for(auto i : B) czy[i]=0;
		return solve(mid, r, czy);
	}
	for(auto i : A) czy[i]=0;
	for(auto i : B) {
		move_outside(Q[i]);
		--m;
	}
	return solve(l, mid-1, czy);
}
int min_cardinality(int _n) {
	n=_n;
	mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
	rep(i, n) {
		Q.pb(i);
		swap(Q[i], Q[rng()%(i+1)]);
	}
	rep(i, n) {
		++m;
		move_inside(Q[i]);
		if(press_button()==1) V.pb(i);
		else {
			move_outside(Q[i]);
			--m;
		}
	}
	vector<int>czy(n, 1);
	for(auto i : V) czy[i]=0;
	rep(i, V.size()) usun.pb(0);
	return solve(1, n/V.size(), czy);
}

Compilation message (stderr)

insects.cpp: In function 'int solve(int, int, std::vector<int>)':
insects.cpp:23:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   if(m==mid*V.size()) break;
      |      ~^~~~~~~~~~~~~~
insects.cpp:25:6: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  if(m==mid*V.size()) {
      |     ~^~~~~~~~~~~~~~
insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:4:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define rep(a, b) for(int a = 0; a < (b); ++a)
      |                                    ^
insects.cpp:54:2: note: in expansion of macro 'rep'
   54 |  rep(i, V.size()) usun.pb(0);
      |  ^~~

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