Submission #743995

#	Time	Username	Problem	Language	Result	Execution time	Memory
743995		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	0 / 100	1594 ms	133768 KiB

Main

#include<bits/stdc++.h>
using namespace std;

struct point
{
    int x,y;
};

int n;
vector<point> vec;

int cnt = 0;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    stack<point> st;
    for(int i=0;i<n;++i)
    {
        int a,b;
        cin >> a >> b;
        vec.push_back({a,b});
    }
    for(int i=0;i<n;++i)
    {
        while(!st.empty() && vec[i].y-st.top().y >= st.top().x-vec[i].x) st.pop();
        if(st.empty() || !(vec[i].y-st.top().y >= st.top().x-vec[i].x))
        {
//            cout << "add " << vec[i].x << " " << vec[i].y << '\n';
            st.push({vec[i].x,vec[i].y});
        }
    }
    cout << st.size();
    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20