Submission #733892

#	Time	Username	Problem	Language	Result	Execution time	Memory
733892		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1828 ms	175888 KiB

Main

#include<bits/stdc++.h>
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define int long long
#define F first
#define S second
#define pb push_back

using namespace std;

stack<pair<int, int > > st;

int check(pair<int, int > a, pair<int, int > b) {
	int c = b.F - a.F;
	if (a.S - b.S >= c) return 1;
	if (b.S - a.S >= c) return 2;
	return 0;
}
void solve() {
	int n; cin >> n;
	int a, b; cin >> a >> b; st.push({a, b});
	for (int i = 1; i < n; i++) {
		cin >> a >> b;

		while (!st.empty()) {
			int x = check(st.top(), {a, b});

			if (x == 0) {st.push({a, b}); break ;}
			if (x == 1) break ;
			st.pop();
			if (st.empty()) st.push({a, b});
		}
	}
	cout << st.size();
}
signed main(){IOS solve(); 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