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답안 #1093840

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1093840 2024-09-27T16:03:09 Z damamila Mobile (BOI12_mobile) C++17
0 / 100
 337 ms 21484 KB 
#include <bits/stdc++.h>

using namespace std;

//~ #define int long long

int n;
double l;
vector<pair<int, int>> points;

pair<double, double> circle_intersection(int i, double r) {
	auto [x, y] = points[i];
	if (y > r) return {-1, -1}; //too far away
	double r2 = r*r;
	double y2 = y*y;
	double tmp = sqrt(r2-y2);
	double x1 = x-tmp;
	double x2 = x+tmp;
	return {x1, x2};
}

void solve() {
	double ub = 1.5e9, lb = 1;
	double m;
	while (lb+0.001 < ub) {
		m = (lb+ub)/2;
		double reach = 0;
		bool ja = 1;
		for (int i = 0; i < n; i++) {
			auto [x1, x2] = circle_intersection(i, m);
			if (reach < x1) ja = 0;
			reach = max(reach, x2);
		}
		if (reach < l) ja = 0;
		if (ja) ub = m;
		else lb = m;
	}
	cout << lb << endl;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);  
	cin >> n >> l;
	cout << fixed << setprecision(4);
	points = vector<pair<int, int>> (n);
	for (int i = 0; i < n; i++) {
		cin >> points[i].first >> points[i].second;
		//~ points[i].second = abs(points[i].second);
	}
	//~ sort(points.begin(), points.end());
	solve();
}

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 456 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Incorrect 1 ms 348 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 536 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Incorrect 2 ms 468 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 1628 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 1580 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 1780 KB Output is correct
2 Incorrect 25 ms 2252 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 26 ms 2652 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 2644 KB Output is correct
2 Incorrect 37 ms 2492 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 130 ms 7872 KB Output is correct
2 Correct 135 ms 10428 KB Output is correct
3 Correct 135 ms 10040 KB Output is correct
4 Incorrect 337 ms 11856 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 128 ms 10956 KB Output is correct
2 Incorrect 179 ms 9556 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 129 ms 9084 KB Output is correct
2 Incorrect 150 ms 12428 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 159 ms 12792 KB Output is correct
2 Incorrect 218 ms 11344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 144 ms 10832 KB Output is correct
2 Incorrect 171 ms 14324 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 174 ms 15040 KB Output is correct
2 Incorrect 245 ms 13136 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 173 ms 12116 KB Output is correct
2 Incorrect 203 ms 16516 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 192 ms 16976 KB Output is correct
2 Incorrect 273 ms 15184 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 210 ms 15148 KB Output is correct
2 Incorrect 245 ms 20560 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 272 ms 21484 KB Output is correct
2 Incorrect 320 ms 20260 KB Output isn't correct
3 Halted 0 ms 0 KB -