Submission #538833

#	Time	Username	Problem	Language	Result	Execution time	Memory
538833		four_specks	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1834 ms	262144 KiB

Main

#include <bits/stdc++.h>

using namespace std;

inline namespace
{
} // namespace

struct Point
{
    long x, y;

    bool covers(const Point &p) const { return abs(x - p.x) <= y - p.y; }
};

void solve()
{
    int n;
    cin >> n;

    stack<Point> st;
    for (int i = 0; i < n; i++)
    {
        Point pt;
        cin >> pt.x >> pt.y;

        while (!st.empty() && pt.covers(st.top()))
            st.pop();
        if (st.empty() || !st.top().covers(pt))
            st.push(pt);
    }

    cout << (int)st.size() << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(NULL);

    solve();

    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20