Submission #1266778

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266778		nguyn	Long Mansion (JOI17_long_mansion)	C++20	0 / 100	156 ms	20728 KiB

long_mansion

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

#define ll long long
#define F first
#define S second
#define pb push_back
#define pii pair<int, int>

const int N = 5e5 + 5;

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

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    for (int i = 1; i < n; i++) cin >> c[i];
    for (int i = 1; i <= n; i++) {
        int sz;
        cin >> sz;
        for (int j = 1; j <= sz; j++) {
            int x; cin >> x;
            vec[i].pb(x);
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j : vec[i]) lst[j] = i;
        if (i < n) prv[i] = lst[c[i]];
    }
    for (int i = 1; i < n; i++) {
        cout << prv[i] << ' ' << nxt[i] << endl;
    }
    for (int i = 1; i <= n; i++) lst[i] = 0;
    for (int i = n; i >= 1; i--) {
        if (i < n) nxt[i] = lst[c[i]];
        for (int j : vec[i]) lst[j] = i;
    }
    for (int i = 1; i <= n; i++) {
        l[i] = r[i] = i;
        while(1) {
            if (l[i] > 1 && nxt[l[i] - 1] <= r[i] && nxt[l[i] - 1]) {
                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] && prv[r[i]]) {
                r[i]++;
            }
            else {
                break;
            }
        }
    }
    cin >> q;
    for (int i = 1; i <= q; i++) {
        int x, y;
        cin >> x >> y;
        if (l[x] <= y && y <= r[x]) {
            cout << "YES\n";
        }
        else cout << "NO\n";
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 15
• Subtask 4: 0 / 75