Submission #1031122

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031122		happy_node	Counting Mushrooms (IOI20_mushrooms)	C++17	45.47 / 100	8 ms	700 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;

const int B=400;

int count_mushrooms(int N) {
	vector<int> posA, posB;
	posA.push_back(0);

	for(int i=1;i<min(N,B);i++) {
		if(use_machine({0,i})==0) posA.push_back(i);
		else posB.push_back(i);
	}

	int ans=posA.size();

	if(posA.size()>posB.size()) {
		int s=posA.size();
		for(int i=B;i<N;i+=s) {
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posA[j-i]);
				qry.push_back(j);
			}	
			int w=use_machine(qry);
			w=(w+1)/2;
			ans+=(qry.size()/2-w);
		}
	} else {
		int s=posB.size();
		for(int i=B;i<N;i+=s) {
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posB[j-i]);
				qry.push_back(j);
			}	
			int w=use_machine(qry);
			w=(w+1)/2;
			ans+=w;
		}
	}

	return ans;
}

• Subtask 1: 45.4728 / 100