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답안 #432306

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
432306 2021-06-18T07:50:46 Z four_specks Mobile (BOI12_mobile) C++17
50 / 100
 1000 ms 48304 KB 
#include <bits/stdc++.h>

using namespace std;

void solve()
{
    struct point
    {
        long x, y;
    };

    int n;
    long l;
    cin >> n >> l;

    vector<point> coords(n);
    for (int i = 0; i < n; i++)
        cin >> coords[i].x >> coords[i].y;

    auto valid = [&](const double &d) -> bool
    {
        vector<pair<double, double>> cov;
        for (auto [x, y] : coords)
        {
            if (y * y < d * d)
            {
                double h = sqrt(d * d - y * y);
                cov.emplace_back(x - h, x + h);
            }
        }
        sort(cov.begin(), cov.end());

        bool ended = 0;
        double e = 0.0;
        for (auto [x1, x2] : cov)
        {
            if (x1 <= e)
            {
                e = max(e, x2);
                if (e >= l)
                {
                    ended = 1;
                    break;
                }
            }
            else
                break;
        }

        return ended;
    };

    double ans = 3e9;
    for (double lo = 0.5; ans - lo > 1e-5;)
    {
        if (double mid = (lo + ans) / 2.0; valid(mid))
            ans = mid;
        else
            lo = mid + 1e-4;
    }

    cout << fixed << setprecision(5) << ans << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(NULL);

    solve();

    return 0;
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 256 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 460 KB Output is correct
2 Correct 4 ms 460 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 4 ms 332 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 616 KB Output is correct
2 Correct 11 ms 764 KB Output is correct
3 Correct 13 ms 604 KB Output is correct
4 Correct 6 ms 596 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 612 KB Output is correct
2 Correct 12 ms 604 KB Output is correct
3 Correct 15 ms 604 KB Output is correct
4 Correct 6 ms 604 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 608 KB Output is correct
2 Correct 10 ms 612 KB Output is correct
3 Correct 15 ms 604 KB Output is correct
4 Correct 6 ms 604 KB Output is correct
5 Correct 8 ms 608 KB Output is correct

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 156 ms 4784 KB Output is correct
2 Correct 284 ms 5168 KB Output is correct
3 Correct 162 ms 3040 KB Output is correct
4 Correct 107 ms 4740 KB Output is correct
5 Correct 93 ms 2936 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 149 ms 4852 KB Output is correct
2 Correct 129 ms 4596 KB Output is correct
3 Correct 129 ms 4852 KB Output is correct
4 Correct 112 ms 4856 KB Output is correct
5 Correct 106 ms 5072 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 234 ms 5380 KB Output is correct
2 Correct 318 ms 4980 KB Output is correct
3 Correct 362 ms 5112 KB Output is correct
4 Correct 85 ms 5432 KB Output is correct
5 Correct 179 ms 5176 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 309 ms 5528 KB Output is correct
2 Correct 385 ms 5536 KB Output is correct
3 Correct 433 ms 5524 KB Output is correct
4 Correct 87 ms 5508 KB Output is correct
5 Correct 173 ms 5508 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 260 ms 5660 KB Output is correct
2 Correct 386 ms 5528 KB Output is correct
3 Correct 446 ms 5516 KB Output is correct
4 Correct 90 ms 5520 KB Output is correct
5 Correct 155 ms 5508 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1077 ms 24308 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1044 ms 24268 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1050 ms 35680 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1077 ms 35632 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1085 ms 38704 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1079 ms 38728 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1078 ms 41900 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1080 ms 41944 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1084 ms 48304 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1078 ms 48116 KB Time limit exceeded
2 Halted 0 ms 0 KB -