oj.uz

Submission #409968

# Submission time Handle Problem Language Result Execution time Memory
409968 2021-05-21T19:56:55 Z BERNARB01 Mobile (BOI12_mobile) C++17
0 / 100
 749 ms 12060 KB 
#include <bits/stdc++.h>

using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, L;
	cin >> n >> L;
	vector<pair<int, int>> p(n);
	for (int i = 0; i < n; i++) {
		cin >> p[i].first >> p[i].second;
	}
	long double l = -1, r = 7;
	for (int itr = 0; itr < 14; itr++) {
		long double mid = (l + r) / 2.0;
		vector<pair<long double, long double>> v;
		int ok = 1;
		for (int i = 0; i < n; i++) {
			long double b = -2.0 * p[i].first;
			long double c = (p[i].first * p[i].first) + (p[i].second * p[i].second) - (mid * mid);
			long double delta = (b * b) - 4.0 * c;
			if (delta < 0) {
				continue;
			}
			long double lb = (-b - sqrtl(delta)) / 2.0, rb = (-b + sqrtl(delta)) / 2.0;
			if (lb > (long double) L) {
				continue;
			}
			while (!v.empty() && lb < v.back().first) {
				v.pop_back();
			}
			if (!v.empty() && v.back().second < lb) {
				ok = 0;
				break;
			}
			v.push_back({lb, rb});
		}
		if (v.empty() || !ok || (!v.empty() && ((min((long double) L, end(v)[-1].second) - max(v[0].first, (long double) 0.0)) < (long double) L))) {
			l = mid;
		} else {
			r = mid;
		}
	}
	cout << setprecision(4) << fixed << (r + l) / 2.0 << '\n';
	return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 48 ms 3164 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 1228 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 54 ms 4552 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 83 ms 1484 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 95 ms 4940 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 329 ms 8128 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 404 ms 4676 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 368 ms 9004 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 474 ms 5380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 438 ms 9868 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 549 ms 6168 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 494 ms 10536 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 618 ms 6956 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 598 ms 12060 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 749 ms 8120 KB Output isn't correct
2 Halted 0 ms 0 KB -