Submission #830229

#	Time	Username	Problem	Language	Result	Execution time	Memory
830229		Edu175	Counting Mushrooms (IOI20_mushrooms)	C++17	56.08 / 100	8 ms	432 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,ioi=b;i<ioi;i++)
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) for(auto dfh:v)cout<<dfh<<" ";cout<<"\n"
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
const ll MAXN=2e4+5;

ll ask(vector<ll>a){
	vector<int>ai;
	for(auto i:a)ai.pb(i);
	return use_machine(ai);
}

const ll B=120;

int count_mushrooms(int N){
	ll n=N;
	vector<ll>a[2];
	a[0]={0};
	ll w=2,p=n;
	fore(i,1,n){
		if(SZ(a[0])==B){
			w=0; p=i;
			break;
		}
		if(SZ(a[1])==B){
			w=1; p=i;
			break;
		}
		if(ask({0,i}))a[1].pb(i);
		else a[0].pb(i);
	}
	ll res=SZ(a[0]);
	for(ll i=p;i<n;i+=SZ(a[w])){
		vector<ll>v;
		ll k=0;
		fore(j,i,min(n,i+SZ(a[w]))){
			v.pb(j); k++;
			v.pb(a[w][j-i]);
		}
		ll resi=(ask(v)+1)/2;
		if(w==0)resi=k-resi;
		res+=resi;
	}
	return res;
}

• Subtask 1: 56.0794 / 100