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Submission #464166

# Submission time Handle Problem Language Result Execution time Memory
464166 2021-08-12T13:22:13 Z dqk Mobile (BOI12_mobile) C++17
0 / 100
 1000 ms 110088 KB 
#include <bits/stdc++.h>

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n;
    double L;
    std::cin >> n >> L;
    std::vector<std::vector<int>> p(n, std::vector<int>(2, 0));
    for (int i = 0; i < n; ++i) {
        std::cin >> p[i][0] >> p[i][1];
        p[i][1] = abs(p[i][1]);
    }
    sort(p.begin(), p.end());
    double d1 = sqrt(p[0][0] * p[0][0] + p[0][1] * p[0][1]);
    double d2 = sqrt((p[0][0] - L) * (p[0][0] - L) + p[0][1] * p[0][1]);
    double lo = 0, hi = std::max(d1, d2);
    while(hi - lo > 1e-3) {
        double mi = (lo + hi) / 2;
        std::vector<std::vector<double>> u;
        bool ltok = false;
        bool rtok = false;
        for (int i = 0; i < n; ++i) {
            double h = p[i][1];
            if (h > mi)
                continue;
            double lf = p[i][0] - sqrt(1ll * mi * mi - 1ll * h * h);
            double rt = p[i][0] + sqrt(1ll * mi * mi - 1ll * h * h);
            if (rt < 0.0 || lf > L)
                continue;
            lf = std::max(lf, 0.0);
            rt = std::min(rt, L);
            u.push_back({lf, rt});
            if (rt == L)
                rtok = true;
            if (lf == 0.0)
                ltok = true;
        }
        sort(u.begin(), u.end());
        bool ok = rtok & ltok;
        double rt = -1;
        for (int i = 0; i < (int)u.size() && ok; ++i) {
            if (i == 0) {
                rt = u[i][1];
            }
            else {
                if (u[i][0] > rt)
                    ok = false;
                rt = u[i][1];
            }
        }
        if (ok) {
            hi = mi;
        }
        else {
            lo = mi;
        }
    }
    std::cout << lo << "\n";
    return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Incorrect 1 ms 204 KB Output isn't correct

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 588 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 844 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 844 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 844 KB Output is correct
2 Incorrect 2 ms 460 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 4320 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 57 ms 9720 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 445 ms 11440 KB Output is correct
2 Incorrect 28 ms 4812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 34 ms 5708 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 269 ms 12256 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1101 ms 55100 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 361 ms 29344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1097 ms 78380 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 216 ms 33148 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1089 ms 89436 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 251 ms 38596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1096 ms 100256 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 290 ms 44040 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1092 ms 110088 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 508 ms 55868 KB Output isn't correct
2 Halted 0 ms 0 KB -