Submission #494524

#	Time	Username	Problem	Language	Result	Execution time	Memory
494524		blue	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1889 ms	157220 KiB

Main

#include <iostream>
#include <vector>
#include <cmath>
#include <cstdlib>
#include <algorithm>
using namespace std;

using pii = pair<int, int>;
#define sz(x) int(x.size())

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

    int N;
    cin >> N;

    vector<int> P;

    int x[1+N], y[1+N];

    cin >> x[1] >> y[1];

    P.push_back(1);

    for(int i = 2; i <= N; i++)
    {
        cin >> x[i] >> y[i];
        if(abs(x[i] - x[P.back()]) <= y[P.back()] - y[i]) continue;
        while(!P.empty() && abs(x[P.back()] - x[i]) <= y[i] - y[P.back()])
            P.pop_back();
        P.push_back(i);
    }

    cout << sz(P) << '\n';
}

• 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