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답안 #432324

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
432324 2021-06-18T08:04:56 Z four_specks Mobile (BOI12_mobile) C++17
9 / 100
 1000 ms 61312 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);
                while (!cov.empty() && cov.back().first > x - h)
                    cov.pop_back();
                cov.emplace_back(x - h, x + h);
            }
        }

        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-3;)
    {
        if (double mid = (lo + ans) / 2.0; valid(mid))
            ans = mid;
        else
            lo = mid + 1e-3;
    }

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

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

    solve();

    return 0;
}

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 1 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

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

Subtask #4
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 460 KB Output is correct
2 Correct 5 ms 604 KB Output is correct
3 Incorrect 4 ms 600 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 4 ms 460 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 652 KB Output is correct
2 Correct 5 ms 672 KB Output is correct
3 Correct 4 ms 636 KB Output is correct
4 Incorrect 3 ms 588 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 80 ms 5316 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 3640 KB Output is correct
2 Correct 56 ms 3232 KB Output is correct
3 Correct 56 ms 3748 KB Output is correct
4 Correct 46 ms 2452 KB Output is correct
5 Correct 44 ms 2184 KB Output is correct

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 108 ms 5980 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 99 ms 3960 KB Output is correct
2 Incorrect 77 ms 5360 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 117 ms 6012 KB Output is correct
2 Incorrect 69 ms 5376 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 629 ms 24716 KB Output is correct
2 Correct 320 ms 17496 KB Output is correct
3 Correct 307 ms 17080 KB Output is correct
4 Incorrect 236 ms 18392 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 323 ms 10124 KB Output is correct
2 Correct 527 ms 30880 KB Output is correct
3 Incorrect 393 ms 30056 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 918 ms 36132 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 370 ms 11744 KB Output is correct
2 Incorrect 672 ms 43480 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1004 ms 39128 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 450 ms 13280 KB Output is correct
2 Correct 756 ms 47964 KB Output is correct
3 Correct 570 ms 47216 KB Output is correct
4 Incorrect 334 ms 25540 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1064 ms 42428 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 482 ms 14864 KB Output is correct
2 Correct 845 ms 52404 KB Output is correct
3 Correct 624 ms 51444 KB Output is correct
4 Correct 384 ms 29296 KB Output is correct
5 Incorrect 486 ms 30720 KB Output isn't correct

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1091 ms 48664 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 605 ms 17648 KB Output is correct
2 Execution timed out 1010 ms 61312 KB Time limit exceeded
3 Halted 0 ms 0 KB -