Submission #924124

#	Time	Username	Problem	Language	Result	Execution time	Memory
924124		pcc	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1364 ms	229296 KiB

Main

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

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,popcnt,sse4")

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


const int mxn = 1e7+10;
pii arr[mxn];
int N;
vector<int> st;

inline bool cover(pii &a,pii &b){
	if(a.fs < b.fs){
		return a.sc-a.fs<=b.sc-b.fs;
	}
	else return a.sc+a.fs<=b.sc+b.fs;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N;
	for(int i = 0;i<N;i++){
		cin>>arr[i].fs>>arr[i].sc;
	}
	for(int i = 0;i<N;i++){
		while(!st.empty()&&cover(arr[st.back()],arr[i]))st.pop_back();
		if(st.empty()||!cover(arr[i],arr[st.back()]))st.push_back(i);
	}
	cout<<st.size();
}

• 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