oj.uz

Submission #1079724

# Submission time Handle Problem Language Result Execution time Memory
1079724 2024-08-28T23:12:06 Z EmmaXII Mobile (BOI12_mobile) C++17
0 / 100
 292 ms 32596 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;

#define all(x) x.begin(), x.end()


int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(NULL);

	int N;
	ll L;
	cin >> N >> L;

	vector<ll> X(N);
	vector<ll> Y(N);
	for (int i=0;i<N;i++) cin >> X[i] >> Y[i];

	auto get_hw = [&](double y, double r) {
		if (abs(y) > r) return -1.0;
		return sqrt((r-y) * (r+y));
	};

	auto can_do = [&](double R) {
		double progress = 0.;
		for (int i=0;i<N;i++) {
			double hw = get_hw((double)Y[i], R);
			if (hw < 0) continue;

			double l = (double)X[i] - hw;
			double r = (double)X[i] + hw;
			if (l <= progress + 1e-6) progress = r;
			if (progress >= (double)L) return true;
		}

		return false;
	};

	double lo = 0;
	ll lhi = L + abs(X[0]) + abs(Y[0]);
	lhi = lhi*lhi;
	for (int i=0;i<N;i++) {
		ll nhi = max(
			X[i]*X[i] + Y[i]*Y[i],
			(X[i]-L)*(X[i]-L) + Y[i]*Y[i]
		);
		lhi = min(nhi, lhi);
	}
	double hi = sqrt(lhi);

	while (hi - lo > 1e-4) {
		double mid = (lo + hi) / 2;
		if (can_do(mid)) hi = mid;
		else lo = mid;
	}
	cout << setprecision(10);
	cout << lo << endl;

	return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Incorrect 0 ms 464 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 464 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Incorrect 2 ms 556 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 21 ms 2392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 12 ms 2392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 2404 KB Output is correct
2 Correct 21 ms 2908 KB Output is correct
3 Correct 17 ms 2652 KB Output is correct
4 Incorrect 21 ms 3932 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 29 ms 3432 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 3416 KB Output is correct
2 Correct 23 ms 3420 KB Output is correct
3 Correct 17 ms 2908 KB Output is correct
4 Incorrect 22 ms 3812 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 117 ms 12372 KB Output is correct
2 Incorrect 122 ms 15968 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 125 ms 16468 KB Output is correct
2 Incorrect 156 ms 14676 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 14928 KB Output is correct
2 Incorrect 144 ms 18912 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 156 ms 19696 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 167 ms 17236 KB Output is correct
2 Incorrect 175 ms 22096 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 177 ms 22784 KB Output is correct
2 Incorrect 231 ms 20612 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 173 ms 19792 KB Output is correct
2 Incorrect 185 ms 25260 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 200 ms 26028 KB Output is correct
2 Incorrect 248 ms 23336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 225 ms 24660 KB Output is correct
2 Incorrect 256 ms 31452 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 252 ms 32596 KB Output is correct
2 Incorrect 292 ms 29420 KB Output isn't correct
3 Halted 0 ms 0 KB -