답안 #1056880

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1056880	2024-08-13T12:05:39 Z	TimAni	Mobile (BOI12_mobile)	C++17	100 / 100	561 ms	8272 KB

mobile

#include <bits/stdc++.h>
#define long long long
 
using namespace std;
 
const double eps = 1E-6;
const int N = (int) 1E6;
 
int n, k;
int x[N], y[N];
 
bool valid(double a) {
	double t = 0;
	for (int i = 0; i < n; i++) {
		if (a < y[i]) {
			continue;
		} 
		double l = x[i] - sqrt(1.0 * a * a - 1.0 * y[i] * y[i]);
		double r = x[i] + sqrt(1.0 * a * a - 1.0 * y[i] * y[i]);
		if (l <= t && r >= t) {
			t = r;
		}
	}
	return t >= k;
}
 
void solve() {
	cin >> n >> k;
	for (int i = 0; i < n; i++) {
		cin >> x[i] >> y[i];
	}
	
    double l = 0, r = 4E9;
    while(r - l > eps) {
        double R = (r + l) / 2;
        if(valid(R)) {
            r = R;
        }
        else {
            l = R;
        }
        
    }
    cout << fixed << setprecision(-log10(eps)) << r << endl;
}
 
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int t;
	t = 1;
	for (int i = 0; i < t; i++) {
		solve();
	}
	return 0;
}

// time-limit: 3000

Subtask #1
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	2396 KB	Output is correct
2	Correct	0 ms	2396 KB	Output is correct
3	Correct	0 ms	2396 KB	Output is correct
4	Correct	0 ms	2396 KB	Output is correct

Subtask #2
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	2392 KB	Output is correct
2	Correct	0 ms	2392 KB	Output is correct
3	Correct	0 ms	2396 KB	Output is correct
4	Correct	0 ms	2396 KB	Output is correct

Subtask #3
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	2396 KB	Output is correct
2	Correct	1 ms	2396 KB	Output is correct
3	Correct	1 ms	2396 KB	Output is correct
4	Correct	1 ms	2396 KB	Output is correct

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	2396 KB	Output is correct
2	Correct	1 ms	2396 KB	Output is correct
3	Correct	1 ms	2396 KB	Output is correct
4	Correct	2 ms	2392 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	2396 KB	Output is correct
2	Correct	1 ms	2396 KB	Output is correct
3	Correct	1 ms	2396 KB	Output is correct
4	Correct	2 ms	2396 KB	Output is correct

Subtask #6
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	2396 KB	Output is correct
2	Correct	2 ms	2396 KB	Output is correct
3	Correct	1 ms	2392 KB	Output is correct
4	Correct	2 ms	2396 KB	Output is correct
5	Correct	1 ms	2396 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	23 ms	4700 KB	Output is correct
2	Correct	17 ms	4748 KB	Output is correct
3	Correct	11 ms	4700 KB	Output is correct
4	Correct	37 ms	4748 KB	Output is correct
5	Correct	11 ms	4700 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	21 ms	4696 KB	Output is correct
2	Correct	31 ms	4696 KB	Output is correct
3	Correct	37 ms	4672 KB	Output is correct
4	Correct	39 ms	4700 KB	Output is correct
5	Correct	44 ms	4700 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	19 ms	4688 KB	Output is correct
2	Correct	18 ms	4676 KB	Output is correct
3	Correct	17 ms	4700 KB	Output is correct
4	Correct	53 ms	6804 KB	Output is correct
5	Correct	34 ms	4948 KB	Output is correct

Subtask #10
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	23 ms	6744 KB	Output is correct
2	Correct	22 ms	6748 KB	Output is correct
3	Correct	19 ms	6796 KB	Output is correct
4	Correct	54 ms	6796 KB	Output is correct
5	Correct	52 ms	6748 KB	Output is correct

Subtask #11
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	23 ms	6748 KB	Output is correct
2	Correct	22 ms	6744 KB	Output is correct
3	Correct	19 ms	6748 KB	Output is correct
4	Correct	56 ms	6796 KB	Output is correct
5	Correct	46 ms	6744 KB	Output is correct

Subtask #12
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	101 ms	6776 KB	Output is correct
2	Correct	113 ms	6748 KB	Output is correct
3	Correct	111 ms	6748 KB	Output is correct
4	Correct	275 ms	6744 KB	Output is correct
5	Correct	227 ms	6748 KB	Output is correct

Subtask #13
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	122 ms	6780 KB	Output is correct
2	Correct	158 ms	6748 KB	Output is correct
3	Correct	98 ms	6744 KB	Output is correct
4	Correct	265 ms	6996 KB	Output is correct
5	Correct	233 ms	6772 KB	Output is correct

Subtask #14
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	123 ms	6748 KB	Output is correct
2	Correct	136 ms	6792 KB	Output is correct
3	Correct	132 ms	6776 KB	Output is correct
4	Correct	354 ms	6780 KB	Output is correct
5	Correct	271 ms	6744 KB	Output is correct

Subtask #15
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	135 ms	6744 KB	Output is correct
2	Correct	178 ms	6776 KB	Output is correct
3	Correct	115 ms	6748 KB	Output is correct
4	Correct	321 ms	6744 KB	Output is correct
5	Correct	279 ms	6748 KB	Output is correct

Subtask #16
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	145 ms	6992 KB	Output is correct
2	Correct	153 ms	7000 KB	Output is correct
3	Correct	169 ms	7032 KB	Output is correct
4	Correct	375 ms	7000 KB	Output is correct
5	Correct	303 ms	7040 KB	Output is correct

Subtask #17
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	159 ms	6996 KB	Output is correct
2	Correct	195 ms	6996 KB	Output is correct
3	Correct	138 ms	6992 KB	Output is correct
4	Correct	397 ms	6996 KB	Output is correct
5	Correct	328 ms	6992 KB	Output is correct

Subtask #18
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	174 ms	7304 KB	Output is correct
2	Correct	182 ms	7248 KB	Output is correct
3	Correct	177 ms	7300 KB	Output is correct
4	Correct	440 ms	7484 KB	Output is correct
5	Correct	374 ms	7252 KB	Output is correct

Subtask #19
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	183 ms	7252 KB	Output is correct
2	Correct	219 ms	7304 KB	Output is correct
3	Correct	152 ms	7292 KB	Output is correct
4	Correct	426 ms	7252 KB	Output is correct
5	Correct	406 ms	7252 KB	Output is correct

Subtask #20
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	198 ms	8016 KB	Output is correct
2	Correct	218 ms	8056 KB	Output is correct
3	Correct	243 ms	8016 KB	Output is correct
4	Correct	531 ms	8064 KB	Output is correct
5	Correct	456 ms	8016 KB	Output is correct

Subtask #21
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	221 ms	8016 KB	Output is correct
2	Correct	267 ms	8272 KB	Output is correct
3	Correct	222 ms	8052 KB	Output is correct
4	Correct	561 ms	8056 KB	Output is correct
5	Correct	490 ms	8076 KB	Output is correct

답안 #1056880

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