이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
// In the name of Allah
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef complex<ld> cld;
#define all(x) (x).begin(),(x).end()
#define len(x) ((ll) (x).size())
#define F first
#define S second
#define X real()
#define Y imag()
#define pb push_back
#define sep ' '
#define endl '\n'
#define Mp make_pair
#define kill(x) cout << x << '\n', exit(0)
#define set_dec(x) cout << fixed << setprecision(x);
#define file_io(x,y) freopen(x, "r", stdin); freopen(y, "w", stdout);
int n, q;
const int maxn = 5e5 + 7;
const int maxlg = 20;
int rmnq[maxn][maxlg], rmxq[maxn][maxlg];
int A[maxn]; vector<int> ls[maxn];
int A1[maxn], A2[maxn], ind[maxn];
vector<int> lsx[maxn]; set<int> st;
int val1[maxn], val2[maxn];
int get_min(int l, int r) {
int j = __lg(r - l);
return min(rmnq[l][j], rmnq[r - (1 << j)][j]);
}
int get_max(int l, int r) {
int j = __lg(r - l);
return max(rmxq[l][j], rmxq[r - (1 << j)][j]);
}
int main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 1; i <= n - 1; i++) {
cin >> A[i]; A[i]--;
}
for (int i = 1; i <= n; i++) {
int T;
cin >> T;
while (T--) {
int x;
cin >> x; x--;
ls[i].pb(x);
}
}
fill(ind, ind + n, 0);
for (int i = 1; i <= n; i++) {
for (int j : ls[i]) ind[j] = i;
if (i <= n - 1) A1[i] = ind[A[i]];
}
fill(ind, ind + n, n + 1);
for (int i = n; i >= 1; i--) {
for (int j : ls[i]) ind[j] = i;
if (i - 1 >= 1) A2[i - 1] = ind[A[i - 1]];
}
st.clear();
for (int i = 0; i <= n + 1; i++) lsx[i].clear();
for (int i = 1; i <= n - 1; i++) lsx[A2[i]].pb(i);
for (int i = n + 1; i >= 0; i--) {
for (int j : lsx[i]) st.insert(j);
if (i - 1 >= 1 && i - 1 <= n - 1) {
if (A1[i - 1] == 0) val1[i - 1] = 0;
else {
auto it = st.lower_bound(A1[i - 1]);
if (it == st.end()) val1[i - 1] = n + 1;
else val1[i - 1] = (*it) + 1;
}
}
}
st.clear();
for (int i = 0; i <= n + 1; i++) lsx[i].clear();
for (int i = 1; i <= n - 1; i++) lsx[A1[i]].pb(i);
for (int i = 0; i <= n + 1; i++) {
for (int j : lsx[i]) st.insert(j);
if (i >= 1 && i <= n - 1) {
if (A2[i] == n + 1) val2[i + 1] = n + 1;
else {
auto it = st.lower_bound(A2[i]);
if (it == st.begin()) val2[i + 1] = 0;
else {
it--; val2[i + 1] = *it;
}
}
}
}
for (int i = n; i >= 1; i--) {
rmnq[i][0] = val1[i]; rmxq[i][0] = val2[i];
for (int j = 1; j < maxlg; j++) {
rmnq[i][j] = rmnq[i][j - 1]; rmxq[i][j] = rmxq[i][j - 1];
if (i + (1 << (j - 1)) <= n) {
rmnq[i][j] = min(rmnq[i][j], rmnq[i + (1 << (j - 1))][j - 1]);
rmxq[i][j] = max(rmxq[i][j], rmxq[i + (1 << (j - 1))][j - 1]);
}
}
}
cin >> q;
while (q--) {
int u, v;
cin >> u >> v;
if (u < v) {
if (get_min(u, v) <= u) cout << "NO" << endl;
else cout << "YES" << endl;
}
else {
if (get_max(v + 1, u + 1) >= u) cout << "NO" << endl;
else cout << "YES" << endl;
}
}
return 0;
}
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