답안 #990606

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
990606	2024-05-30T17:10:50 Z	Ska	Mobile (BOI12_mobile)	C++14	50 / 100	299 ms	6144 KB

mobile

#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e5 + 5;
 
int n;
double m;
double x[N], y[N];
 
pair<double, double> calc(double r, int i) {
    if (r < abs(y[i])) {
        return {-1, -1};
    }
    return {x[i] - sqrt(r * r - y[i] * y[i]), x[i] + sqrtl(r * r - y[i] * y[i])};
}
 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    double l = 2e9, r = 1.5e9;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i] >> y[i];
        l = min(l, abs(y[i]));
    }
    while (r - l >= 1e-3) {
        vector<pair<double, double>> segments;
        double mid = (l + r) / 2;
        for (int i = 1; i <= n; ++i) {
            auto x = calc(mid, i);
            if (x.first != -1 || x.second != -1) {
                segments.emplace_back(x.first, x.second);
            }
        }
        sort(segments.begin(), segments.end());
        double bound = 0;
        for (auto x : segments) {
            if (x.first > bound) {
                break;
            }
            bound = max(bound, x.second);
            if (bound >= m) {
                break;
            }
        }
        if (bound >= m) {
            r = mid;
        } else {
            l = mid;
        }
    }
    cout << fixed << setprecision(6) << l << '\n';
}

Subtask #1
4.0 / 4.0

#	결과	메모리	Grader output
1	Correct	348 KB	Output is correct
2	Correct	348 KB	Output is correct
3	Correct	348 KB	Output is correct
4	Correct	348 KB	Output is correct

Subtask #2
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct

Subtask #3
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	600 KB	Output is correct
2	Correct	3 ms	604 KB	Output is correct
3	Correct	2 ms	348 KB	Output is correct
4	Correct	3 ms	604 KB	Output is correct

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	764 KB	Output is correct
2	Correct	6 ms	764 KB	Output is correct
3	Correct	9 ms	764 KB	Output is correct
4	Correct	6 ms	744 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	772 KB	Output is correct
2	Correct	7 ms	764 KB	Output is correct
3	Correct	9 ms	764 KB	Output is correct
4	Correct	5 ms	768 KB	Output is correct

Subtask #6
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	756 KB	Output is correct
2	Correct	7 ms	764 KB	Output is correct
3	Correct	11 ms	764 KB	Output is correct
4	Correct	5 ms	732 KB	Output is correct
5	Correct	6 ms	768 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	106 ms	4988 KB	Output is correct
2	Correct	192 ms	4928 KB	Output is correct
3	Correct	113 ms	3172 KB	Output is correct
4	Correct	87 ms	4884 KB	Output is correct
5	Correct	75 ms	3064 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	116 ms	5020 KB	Output is correct
2	Correct	102 ms	4792 KB	Output is correct
3	Correct	106 ms	5032 KB	Output is correct
4	Correct	93 ms	5012 KB	Output is correct
5	Correct	88 ms	5184 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	122 ms	5944 KB	Output is correct
2	Correct	213 ms	5152 KB	Output is correct
3	Correct	247 ms	5196 KB	Output is correct
4	Correct	77 ms	5564 KB	Output is correct
5	Correct	131 ms	5320 KB	Output is correct

Subtask #10
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	207 ms	5656 KB	Output is correct
2	Correct	275 ms	5644 KB	Output is correct
3	Correct	299 ms	5664 KB	Output is correct
4	Correct	74 ms	5640 KB	Output is correct
5	Correct	133 ms	5656 KB	Output is correct

Subtask #11
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	153 ms	5928 KB	Output is correct
2	Correct	276 ms	5652 KB	Output is correct
3	Correct	289 ms	6144 KB	Output is correct
4	Correct	76 ms	5548 KB	Output is correct
5	Correct	131 ms	5660 KB	Output is correct

Subtask #12
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	20 ms	1884 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #13
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	25 ms	1872 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #14
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	20 ms	1884 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #15
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	25 ms	1852 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #16
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	20 ms	1984 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #17
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	26 ms	3664 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #18
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	20 ms	1884 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #19
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	26 ms	3672 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #20
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	26 ms	1884 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #21
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Runtime error	26 ms	3668 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

답안 #990606

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