Submission #1060724

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060724		AdamGS	Rarest Insects (IOI22_insects)	C++17	99.16 / 100	51 ms	1220 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;
int n;
int solve(int l, int r, vector<int>czy) {
	if(l==r) return l;
	int mid=(l+r+1)/2;
	vector<int>P;
	rep(i, n) if(czy[i]) {
		move_inside(i);
		if(press_button()==mid+1) move_outside(i);
		else P.pb(i);
	}
	bool ok=true;
	vector<int>A, B;
	rep(j, V.size()) if(!usun[j]) {
		int i=V[j];
		move_inside(i);
		if(press_button()<=mid) {
			ok=false;
			A.pb(j);
		} else B.pb(j);
		move_outside(i);
	}
	if(ok) {
		for(auto i : P) czy[i]=0;
		return solve(mid, r, czy);
	}
	for(auto i : B) usun[i]=1;
	rep(i, n) czy[i]=0;
	for(auto i : P) czy[i]=1;
	for(auto i : P) move_outside(i);
	return solve(l, mid-1, czy);
}
int min_cardinality(int _n) {
	n=_n;
	rep(i, n) {
		move_inside(i);
		if(press_button()==1) V.pb(i);
		else move_outside(i);
	}
	for(auto i : V) move_outside(i);
	vector<int>czy(n, 1);
	for(auto i : V) czy[i]=0;
	rep(i, V.size()) usun.pb(0);
	return solve(0, (n-V.size())/V.size(), czy)+1;
}

Compilation message (stderr)

insects.cpp: In function 'int solve(int, int, std::vector<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:22:2: note: in expansion of macro 'rep'
   22 |  rep(j, V.size()) if(!usun[j]) {
      |  ^~~
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:51:2: note: in expansion of macro 'rep'
   51 |  rep(i, V.size()) usun.pb(0);
      |  ^~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.16 / 75