Submission #1326323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326323		PieArmy	Park (JOI17_park)	C++20	20 / 100	97 ms	632 KiB

park

#include<bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define fr first
#define sc second
#define endl '\n'
using namespace std;
#define mid ((left+right)>>1)
#include "park.h"
mt19937 rng(chrono::high_resolution_clock().now().time_since_epoch().count());
int rint(int a,int b){
	int ans=0;
	ans=a+(rng()%(b-a+1));
	return ans;
}

int n;
static int arr[1400];
vector<int>need[1400];

set<pair<int,int>>soruldu;

void answer(int x,int y){
	if(x>y)swap(x,y);
	if(soruldu.count({x,y}))return;
	soruldu.insert({x,y});
	Answer(x,y);
}

bool ask(int x,int y){
	if(x>y)swap(x,y);
	return Ask(x,y,arr);
}

vector<int> fastsort(vector<int>v,int left){
	if(!v.size())return v;
	int x=rint(0,v.size()-1);
	vector<int>a,b;
	for(int i=0;i<v.size();i++){
		if(i==x)continue;
		for(int j=0;j<n;j++){
			arr[j]=0;
		}
		for(int j=0;j<v.size();j++){
			arr[v[j]]=1;
		}
		arr[v[i]]=0;
		arr[left]=1;
		if(ask(left,v[x])){
			b.pb(v[i]);
		}
		else{
			a.pb(v[i]);
		}
	}
	a=fastsort(a,left);
	b=fastsort(b,v[x]);
	x=v[x];
	v.clear();
	if(a.size())answer(a.back(),x);
	if(b.size())answer(b[0],x);
	for(int y:a){
		v.pb(y);
	}
	v.pb(x);
	for(int y:b){
		v.pb(y);
	}
	return v;
}

void Detect(int T, int N) {
	n=N;
	if(T==1){
		for(int i=0;i<n-1;i++){
			for(int j=i+1;j<n;j++){
				for(int l=0;l<n;l++){
					arr[l]=0;
				}
				arr[i]=arr[j]=1;
				if(ask(i,j))answer(i,j);
			}
		}
		return;
	}
	if(T==2){
		vector<int>v(n-2);
		iota(v.begin(),v.end(),1);
		v=fastsort(v,0);
		if(n==2){
			answer(0,1);
			return;
		}
		answer(0,v[0]);
		answer(v.back(),n-1);
		return;
	}
	if(true){
		for(int i=1;i<n;i++){
			if(need[i].size()==0){
				int r=n-2;
				while(r>=0){
					vector<int>v(n-1);
					for(int j=0;j<n-1;j++){
						v[j]=j+(j>=i);
					}
					int l=0;
					while(l<r){
						int mi=(l+r)/2;
						for(int j=0;j<=mi;j++){
							arr[v[j]]=1;
						}
						for(int j=mi+1;j<n-1;j++){
							arr[v[j]]=0;
						}
						for(int j:need[i]){
							arr[j]=1;
						}
						arr[i]=1;
						if(ask(0,i))r=mi;
						else l=mi+1;
					}
					need[i].pb(v[r]);
					r--;
				}
				for(int j:need[i]){
					need[j]=need[i];
				}
			}
			for(int j:need[i]){
				if(j==i)continue;
				for(int l=0;l<n;l++){
					arr[l]=0;
				}
				arr[i]=arr[j]=1;
				if(ask(i,j))answer(i,j);
			}
		}
		return;
	}
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30
• Subtask 5: 0 / 23