Submission #1225766

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225766		_rain_	Long Mansion (JOI17_long_mansion)	C++20	100 / 100	349 ms	88336 KiB

long_mansion

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

const int N=(int)5e5;
	int x[N+2],y[N+2],c[N+2],b[N+2];
	vector<int>arr[N+2];
	int n,q;
	
namespace subtask3{
	
	int lef[N+2],rig[N+2];
	set<int>pos[N+2];
	
	bool inside(int l,int r,int x){
		auto it=pos[x].lower_bound(l);
		if (it==pos[x].end()) return false;
		return *it<=r;
	}
	
	void main_code(){
		for(int i=1;i<=n;++i){
			for(auto&x:arr[i]) pos[x].insert(i);
		}
		
		for(int i=1;i<=n;++i){
			lef[i]=rig[i]=i;
			bool nxt=true;
			while (true){
				if (lef[i]>1 && inside(lef[i],rig[i],c[lef[i]-1])){
					rig[i]=max(rig[i],rig[lef[i]-1]);
					lef[i]=lef[lef[i]-1];
				}
				else if (rig[i]<n && inside(lef[i],rig[i],c[rig[i]])) rig[i]++;
				else break;
			}
		}
		for(int i=1;i<=q;++i){
			bool ok=(lef[x[i]] <= y[i] && y[i]<=rig[x[i]]);
			cout<<(ok?"YES":"NO")<<'\n';
		}
	}
	
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0) ; cout.tie(0);
	#define task "main"
	if (fopen(task".inp","r")){
		freopen(task".inp","r",stdin);
		freopen(task".out","w",stdout);
	}
	
	cin>>n;
	for(int i=1;i<n;++i) cin>>c[i];
	for(int i=1;i<=n;++i){
		cin>>b[i];
		arr[i].resize(b[i]);
		for(auto&x:arr[i]) cin>>x;
	}
	cin>>q;
	for(int i=1;i<=q;++i) cin>>x[i]>>y[i];
	return subtask3::main_code(),0;
	assert(false);
	return 0;
}

Compilation message (stderr)

long_mansion.cpp: In function 'int main()':
long_mansion.cpp:51:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |                 freopen(task".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
long_mansion.cpp:52:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |                 freopen(task".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 15 / 15
• Subtask 4: 75 / 75