Submission #1211353

#	Time	Username	Problem	Language	Result	Execution time	Memory
1211353		Zbyszek99	Long Mansion (JOI17_long_mansion)	C++20	100 / 100	163 ms	66780 KiB

long_mansion

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

int rep_[500'002];

int fint(int v)
{
    if(rep_[v] == v) return v;
    rep_[v] = fint(rep_[v]);
    return rep_[v];
}

void onion(int a, int b)
{
    a = fint(a);
    b = fint(b);
    rep_[a] = b;
}

int key[500'002];
vi keys[500'002];
pii ans[500'002];
int prev_[500'002];
int Lp[500'002];
int Rp[500'002];
int odw[500'002];
int n;

pii dfs(int v)
{
    v = fint(v);
    if(odw[v]) return ans[v];
    odw[v] = 2;
    int l = v;
    int r = v;
    while(true)
    {
        ans[fint(v)] = {l,r};
       //cout << v << " " << l << " " << r << " seg\n";
        bool was = 0;
        if(l != 1 && Rp[l-1] <= r)
        {
            pii new_seg = dfs(l-1);
            if(new_seg.ss >= v)
            {
                onion(v,l-1);
                ans[v] = new_seg;
                return ans[v];
            }
            l = min(l,new_seg.ff);
            r = max(r,new_seg.ss);
            was = 1;
        }
        ans[fint(v)] = {l,r};
        //cout << v << " " << l << " " << r << " seg\n";
        if(r != n && Lp[r] >= l)
        {
            pii new_seg = dfs(r+1);
            if(new_seg.ff <= v)
            {
                onion(v,r+1);
                ans[v] = new_seg;
                return ans[v];
            }
            l = min(l,new_seg.ff);
            r = max(r,new_seg.ss);
            was = 1;
        }
        ans[fint(v)] = {l,r};
        //cout << v << " " << l << " " << r << " seg\n";
        if(!was) break;
    }
    ans[fint(v)] = {l,r};
    odw[v] = 1;
    return {l,r};
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    cin >> n;
    rep2(i,1,n) rep_[i] = i;
    rep_[n+1] = n+1;
    rep2(i,1,n-1) cin >> key[i];
    key[n] = 0;
    rep2(i,1,n)
    {
        int x;
        cin >> x;
        rep(j,x)
        {
            int z;
            cin >> z;
            keys[i].pb(z);
        }
    }
    rep2(i,1,n-1)
    {
        forall(it,keys[i]) prev_[it] = i;
        Lp[i] = prev_[key[i]];
    }
    rep2(i,1,n) prev_[i] = n+1;
    for(int i = n; i >= 1; i--)
    {
        Rp[i] = prev_[key[i]];
        forall(it,keys[i]) prev_[it] = i;
    }
    rep2(i,1,n)
    {
        if(odw[i] == 0)
        {
            dfs(i);
        }
    }
    int q;
    cin >> q;
    rep(qq,q)
    {
        int a,b;
        cin >> a >> b;
        if(ans[a].ff <= b && ans[a].ss >= b) cout << "YES\n";
        else cout << "NO\n";
    }
}

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