Submission #1248996

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248996		chikien2009	Advertisement 2 (JOI23_ho_t2)	C++20	100 / 100	619 ms	21964 KiB

Main

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

struct SEGMENT_TREE
{
    int tree[2000000];
    inline SEGMENT_TREE()
    {
        fill_n(tree, 2000000, -2e9);
    }
    inline void Update(int ind, int l, int r, int x, int v)
    {
        if (r < x || x < l)
        {
            return;
        }
        if (l == r)
        {
            tree[ind] = max(tree[ind], v);
            return;
        }
        int m = (l + r) >> 1;
        Update(ind << 1, l, m, x, v);
        Update(ind << 1 | 1, m + 1, r, x, v);
        tree[ind] = max(tree[ind << 1], tree[ind << 1 | 1]);
    }
    inline int Get(int ind, int l, int r, int x, int y)
    {
        if (r < x || y < l)
        {
            return -2e9;
        }
        if (x <= l && r <= y)
        {
            return tree[ind];
        }
        int m = (l + r) >> 1;
        return max(Get(ind << 1, l, m, x, y), Get(ind << 1 | 1, m + 1, r, x, y));
    }
} st1, st2;

int n, a, b, c[500000], d, m, res;
pair<int, int> p[500000];

int main()
{
    setup();

    cin >> n;
    res = n;
    for (int i = 0; i < n; ++i)
    {
        cin >> p[i].second >> p[i].first;
        c[i] = p[i].second;
    }
    sort(c, c + n);
    m = unique(c, c + n) - c;
    sort(p, p + n, greater<pair<int, int>>());
    for (int i = 0; i < n; ++i)
    {
        d = lower_bound(c, c + m, p[i].second) - c + 1;
        a = st1.Get(1, 1, m, 1, d);
        b = st2.Get(1, 1, m, d, m);
        if (p[i].first + p[i].second <= a ||
            p[i].first - p[i].second <= b)
        {
            res--;
        }
        st1.Update(1, 1, m, d, p[i].first + p[i].second);
        st2.Update(1, 1, m, d, p[i].first - p[i].second);
    }
    cout << res;
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31