Submission #615815

#	Time	Username	Problem	Language	Result	Execution time	Memory
615815		Koosha_mv	Counting Mushrooms (IOI20_mushrooms)	C++14	56.93 / 100	11 ms	592 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,int(v.size())) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
 
const int S=187,N=20202;
 
mt19937 rng(time(nullptr));
 
int n,ans,mark[N];
vector<int> A,B;
 
int get(vector<int> vec){
	if(vec.size()<=A.size()){
		vector<int> res;
		f(i,0,int(vec.size())) res.pb(vec[i]),res.pb(A[i]);
		int prt=use_machine(res);
		//if(prt&1) B.pb(vec[0]);
		//else A.pb(vec[0]);
		prt=(prt+1)/2;
		return int(vec.size())-prt;
	}
	else{
		vector<int> res;
		f(i,0,int(vec.size())) res.pb(vec[i]),res.pb(B[i]);
		int prt=use_machine(res);
		//if(prt&1) A.pb(vec[0]);
		//else B.pb(vec[0]);
		prt=(prt+1)/2;
		return prt;
	}
}
int count_mushrooms(int _n) {
	n=_n;
	A.pb(0);
	vector<int> p(n-1);
	iota(all(p),1);
	shuffle(all(p),rng);
	f(i,0,min(n-1,S-1)){
		vector<int> vec;
		vec.pb(0);
		vec.pb(p[i]);
		mark[p[i]]=1;
		//dbgv(vec);
		if(use_machine(vec)==0){
			A.pb(p[i]);
		}
		else{
			B.pb(p[i]);
		}
	}
	vector<int> vec;
	f(i,1,n){
		if(mark[i]) continue ;
		vec.pb(i);
		if(int(vec.size())>=max(int(A.size()),int(B.size()))){
			ans+=get(vec);
			vec.clear();
		}
	}
	if(vec.size()) ans+=get(vec);
	return ans+A.size();
}

• Subtask 1: 56.927 / 100