Submission #405433

#	Time	Username	Problem	Language	Result	Execution time	Memory
405433		saleh	Circle selection (APIO18_circle_selection)	C++17	12 / 100	1809 ms	56116 KiB

circle_selection

#include <bits/stdc++.h>

#define ft first
#define sd second

using namespace std;

typedef pair<int, int> pii;

const int MAXN = 300 * 1000 + 23;















int n, x[MAXN], y[MAXN], r[MAXN], par[MAXN];
set<pii> ed, st;
struct cmp { bool operator ()(int a, int b) const { return r[a] > r[b]? true: (r[a] == r[b]? a < b: false); } };
set<int, cmp> s;



int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> x[i] >> y[i] >> r[i];
		if (y[i] != 0) return 0;
		y[i] = x[i] + r[i];
		x[i] -= r[i];
		st.insert({x[i], i});
		ed.insert({y[i], i});
		s.insert(i);
	}
	while (s.size()) {
		int a = *s.begin();
		auto b = st.lower_bound({x[a], -1});
		while (b != st.end() && b -> ft <= y[a]) {
			par[b -> sd] = a;
			s.erase(b -> sd);
			ed.erase({y[b -> sd], b -> sd});
			b = st.erase(b);
		}
		b = ed.lower_bound({x[a], -1});
		while (b != ed.end() && b -> ft <= y[a]) {
			par[b -> sd] = a;
			s.erase(b -> sd);
			st.erase({x[b -> sd], b -> sd});
			b = ed.erase(b);
		}
	}
	for (int i = 0; i < n; i++) cout << par[i] + 1 << ' ';
	return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 12 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13