Submission #615886

#	Time	Username	Problem	Language	Result	Execution time	Memory
615886		Koosha_mv	Counting Mushrooms (IOI20_mushrooms)	C++14	74.10 / 100	119 ms	32540 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 N=20202,M=404;
 
int n,ans,mark[N],dp[N][M];
vector<int> A,B;

int calc(int n,int x){
  if(n<=0 || x>=M) return 0;
  if(dp[n][x]!=-1) return dp[n][x];
  return dp[n][x]=min(calc(n-2,x+2),calc(n-(x+1)/2,x+1))+1; 
}
int get(int l,int r){
	vector<int> vec;
	f(i,l,r+1) vec.pb(i);
	//dbgv(vec);
	return use_machine(vec);
}
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) {
	f(i,0,N) f(j,0,M) dp[i][j]=-1;
	n=_n;
	mark[0]=mark[1]=1;
	A.pb(0);
	int now=use_machine({0,1});
	if(now==0){
		A.pb(1);
	}
	else{
		B.pb(1);
	}
	int l=1,r=n;
	while(l+1<r){
		int mid=(l+r)>>1;;
		if(now==get(0,mid)) l=mid;
		else r=mid;
	}
	if(r==n && now==0){
		return n;
	}
	if(r==n && now==1){
		mark[2]=1;
		B.pb(2);
	}
	else{
		if(get(0,r)&1){
			B.pb(r);
		}
		else{
			A.pb(r);
		}
	}
	mark[r]=1;
	//dbgv(A);
	//dbgv(B);
	ans=A.size();
	vector<int> al,vec;
	f(i,0,n) if(!mark[i]) al.pb(i);
	while(al.size()){
		int i=al.back();
		//eror(i);
		al.pop_back();
		vec.pb(i);
		int m=int(al.size())+2,sz=A.size()+B.size();
		if(1 && vec.size()==2 && calc(m-2,sz+2)<calc(m-(sz+1)/2,sz+1)){
			if(A.size()>=2 && B.size()>=1){
				vector<int> res;
				res.pb(A[0]);
				res.pb(vec[0]);
				res.pb(A[1]);
				res.pb(B[0]);
				res.pb(vec[1]);
				int prt=use_machine(res)-1;
				if(prt&2){
					B.pb(vec[0]);
				}
				else{
					ans++;
					A.pb(vec[0]);
				}
				if(prt&1){
					ans++;
					A.pb(vec[1]);
				}
				else{
					B.pb(vec[1]);
				}
			}
			else{
				vector<int> res;
				res.pb(B[0]);
				res.pb(vec[0]);
				res.pb(B[1]);
				res.pb(A[0]);
				res.pb(vec[1]);
				int prt=use_machine(res)-1;
				if(prt&2){
					ans++;
					A.pb(vec[0]);
				}
				else{
					B.pb(vec[0]);
				}
				if(prt&1){
					B.pb(vec[1]);
				}
				else{
					ans++;
					A.pb(vec[1]);
				}
			}
			vec.clear();
		}
		else if(int(vec.size())>=max(int(A.size()),int(B.size()))){
			ans+=get(vec);
			vec.clear();
		}
	}
	if(vec.size()){
		ans+=get(vec);
	}
	//eror(ans);
	return ans;
}

• Subtask 1: 74.0984 / 100