Submission #1011586

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011586		victor_gao	Gift Exchange (JOI24_ho_t4)	C++17	20 / 100	96 ms	17236 KiB

Main

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include <bits/stdc++.h>
#define int long long
#define pii pair<int, int>
#define x first
#define y second
#define N 500015
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n, q, nxt[N];
pii arr[N];
struct segtree1{
    int seg[4 * N];
    void init(int l, int r, int i, int c){
        seg[i] = c;
        if (l == r) return;
        int mid = (l + r) >> 1;
        init(l, mid, 2 * i, c);
        init(mid + 1, r, 2 * i + 1, c);
    }
    void modify(int l, int r, int i, int p, int c){
        if (l == r){
            seg[i] = c;
            return;
        }
        int mid = (l + r) >> 1;
        if (p <= mid) modify(l, mid, 2 * i, p, c);
        else modify(mid + 1, r, 2 * i + 1, p, c);
        seg[i] = min(seg[2 * i], seg[2 * i + 1]);
    }
    int queryp(int l, int r, int i, int ll, int rr, int c){
        int mid = (l + r) >> 1;
        if (l == r)
            return (seg[i] > c) ? 1e9 : l;
        else if (ll <= l && rr >= r){
            if (seg[i] > c)
                return 1e9;
            else if (seg[2 * i] <= c)
                return queryp(l, mid, 2 * i, ll, rr, c);
            else return queryp(mid + 1, r, 2 * i + 1, ll, rr, c);
        }
        int res = 1e9;
        if (ll <= mid)
            res = queryp(l, mid, 2 * i, ll, rr, c);
        if (rr > mid && res > 1e8)
            res = queryp(mid + 1, r, 2 * i + 1, ll, rr, c);
        return res;
    }
}seg1;
struct segtree2{
    int seg[4 * N];
    void modify(int l, int r, int i, int p, int c){
        if (l == r){
            seg[i] = c;
            return;
        }
        int mid = (l + r) >> 1;
        if (p <= mid) modify(l, mid, 2 * i, p, c);
        else modify(mid + 1, r, 2 * i + 1, p, c);
        seg[i] = max(seg[2 * i], seg[2 * i + 1]);
    }
    int query(int l, int r, int i, int ll, int rr){
        if (ll <= l && rr >= r)
            return seg[i];
        int mid = (l + r) >> 1;
        if (rr <= mid) return query(l, mid, 2 * i, ll, rr);
        else if (ll > mid) return query(mid + 1, r, 2 * i + 1, ll, rr);
        else return max(query(l, mid, 2 * i, ll, rr),
                        query(mid + 1, r, 2 * i + 1, ll, rr));
    }
}seg2;
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    vector<pair<pii, int> > all;
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> arr[i].x;
    for (int i = 1; i <= n; i++)
        cin >> arr[i].y;
    seg1.init(1, n, 1, (int)1e9);
    for (int i = n; i >= 1; i--){
        nxt[i] = seg1.queryp(1, n, 1, i, n, arr[i].x);
        seg1.modify(1, n, 1, i, arr[i].y);
    }
    // for (int i = 1; i <= n; i++)
    //     cerr << nxt[i] << " \n"[i == n];
    for (int i = 1; i < n; i++)
        seg2.modify(1, n, 1, i, min(nxt[i], nxt[i + 1]));

    cin >> q;
    while (q--){
        int l, r; cin >> l >> r;
        int ans = seg2.query(1, n, 1, l, r - 1);
        cout << ((ans > r || nxt[l] > r) ? "No\n" : "Yes\n");
    }
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 5
• Subtask 3: 0 / 10
• Subtask 4: 0 / 31
• Subtask 5: 8 / 8
• Subtask 6: 12 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12