제출 #1254896

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1254896		thdh__	Long Mansion (JOI17_long_mansion)	C++20	100 / 100	500 ms	52948 KiB

long_mansion

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define eb emplace_back
#define pu push
#define ins insert
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define bruh ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define fu(x,a,b) for (auto x=a;x<=b;x++)
#define fd(x,a,b) for (auto x=a;x>=b;x--)
#define int ll

using namespace std;
//mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());

/*
Competitive Programming notes that I need to study & fix my dumbass self:

1. Coding:
- Always be sure to check the memory of arrays (maybe use vectors), for loops
- Always try to maximize the memory if possible, even if you are going for subtasks
- Do not exploit #define int long long, it will kill you

2. Stress: 
- Always try generating big testcases and try if they run

3. Time management:
- Don't overcommit or undercommit, always spend a certain amount of time to think a problem, don't just look at it and say I'm fucked
- Do not spend too much time coding brute-force solutions, they should be easily-codable solutions that don't take up too much time

Time management schedule:
Offline / LAH days (4 problems - 3h):
15' thinking of solution / idea
1. no idea: skip
2. yes idea: continue thinking for <= 15'

+ implementing: <= 20'
+ brute-force: <= 5'
+ test generator: <= 5'

I hate offline because I am dumb
*/

typedef pair<int, int> ii;
const int N = 5e5+5;
const int B = 750;
const int mod = 1e9+7;
const int inf = 1e18;
using cd = complex<double>;
const long double PI = acos(-1);
int power(int a,int b) {ll x = 1;if (a >= mod) a%=mod; while (b) {if (b & 1) x = x*a % mod;a = a*a % mod;b>>=1;}return x;} 

int n,q;
int c[N];
vector<int> a[N];
int prv[N], nxt[N], lst[N];
int l[N], r[N];

void solve()
{
	cin>>n;
	for (int i = 1; i < n; i++) cin>>c[i];
	for (int i = 1; i <= n; i++) 
	{
		int m; cin>>m;
		for (int j = 0; j < m; j++) 
		{
			int x; cin>>x;
			a[i].pb(x);
		}
	}
	for (int i = 1; i < n; i++) 
	{
		for (auto j : a[i]) lst[j] = i;
		prv[i] = lst[c[i]];
	}
	for (int i = 1; i <= n; i++) lst[i] = inf;
	for (int i = n; i >= 2; i--) 
	{
		for (auto j : a[i]) lst[j] = i;
		nxt[i] = lst[c[i-1]];
	}
	for (int i = 1; i <= n; i++) 
	{
		l[i] = r[i] = i;
		while (true) 
		{
			if (l[i] > 1 && nxt[l[i]] <= r[i]) 
			{
				l[i]--;
				if (r[l[i]] >= i) 
				{
					r[i] = r[l[i]], l[i] = l[l[i]];
					break;
				}
			} else if (r[i] < n && prv[r[i]] >= l[i]) 
			{
				r[i]++;
			} else break;
		}
	}
	// for (int i = 1; i <= n; i++) cout<<prv[i]<<" ";
	// cout<<endl;
	// for (int i = 1; i <= n; i++) cout<<nxt[i]<<" ";
	// cout<<endl;
	// for (int i = 1; i <= n; i++) cout<<l[i]<<" "<<r[i]<<endl;
	cin>>q;
	while (q--) 
	{
		int x, y;
		cin>>x>>y;
		if (r[x] >= y && y >= l[x]) 
		{
			cout<<"YES"<<endl;
		} else cout<<"NO"<<endl;
	}
}

/*
Go through the mistakes you usually make and revise your code, for god's sake...
*/

signed main()
{
	bruh
	//freopen("input.inp","r",stdin);
	//freopen("output.inp","w",stdout);
	int t = 1;
	// cin>>t;
	while (t--)
	{
		solve();
		cout<<"\n";
	}
}

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