Submission #781872

#	Time	Username	Problem	Language	Result	Execution time	Memory
781872		borisAngelov	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	671 ms	56940 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int maxn = 500005;

int n;

struct resident
{
    int e;
    int x;
};

resident a[maxn];

bool cmp(resident p, resident q)
{
    return p.e > q.e;
}

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

int main()
{
    fastIO();

    cin >> n;

    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i].x >> a[i].e;
    }

    sort(a + 1, a + n + 1, cmp);

    set<pair<int, int>> smaller;
    set<pair<int, int>> bigger;

    int ans = 0;

    for (int i = 1; i <= n; ++i)
    {
        bool covered = false;

        auto it = smaller.lower_bound(make_pair(a[i].e - a[i].x, 0));

        if (it != smaller.end() && it->second >= a[i].x)
        {
            covered = true;
        }

        auto it2 = bigger.lower_bound(make_pair(a[i].e + a[i].x, 0));

        if (it2 != bigger.end() && it2->second <= a[i].x)
        {
            covered = true;
        }

        if (covered == false)
        {
            ++ans;
            smaller.insert(make_pair(a[i].e - a[i].x, a[i].x));
            bigger.insert(make_pair(a[i].e + a[i].x, a[i].x));
        }
    }

    cout << ans << endl;

    return 0;
}

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