Submission #744004

#	Time	Username	Problem	Language	Result	Execution time	Memory
744004		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1691 ms	156524 KiB

Main

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

struct point
{
    int x,y;
};

int n;
vector<point> vec;
stack<point> st;
int cnt = 0;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    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 >= vec[i].x-st.top().x) st.pop();
        if(st.empty() || !(st.top().y-vec[i].y >= vec[i].x-st.top().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: 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