Submission #674888

#	Time	Username	Problem	Language	Result	Execution time	Memory
674888		QwertyPi	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1649 ms	174052 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int N = 1e7 + 11;
int p[N][2], pi = 0;
int main(){
	cin.tie(0); cout.tie(0)->sync_with_stdio(false);
	int n; cin >> n;
	for(int i = 0; i < n; i++){
		int x, y; cin >> x >> y;
		while(pi > 0 && abs(p[pi - 1][0] - x) <= y - p[pi - 1][1]) pi--;
		if(pi > 0 && abs(p[pi - 1][0] - x) <= p[pi - 1][1] - y) continue;
		p[pi][0] = x, p[pi][1] = y; pi++;
	}
	cout << pi << endl;
}

• 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