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Submission #464126

# Submission time Handle Problem Language Result Execution time Memory
464126 2021-08-12T12:17:49 Z dqk Mobile (BOI12_mobile) C++17
0 / 100
 232 ms 2364 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;
    for (int i = 0; i < n; ++i) {
        int x, y;
        std::cin >> x >> y;
        y = abs(y);
        if (i == 0)
            p.push_back({x, y});
        else {
            if (x == p[p.size() - 1][0])
                p[p.size() - 1][1] = std::min(p[p.size() - 1][1], y);
        }
    }
    n = (int) p.size();
    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-4) {
        double mi = (lo + hi) / 2;
        std::vector<std::vector<double>> u;
        for (int i = 0; i < n; ++i) {
            double h = p[i][1];
            if (h > mi)
                continue;
            double lf = p[i][0] - sqrt(mi * mi - h * h);
            double rt = p[i][0] + sqrt(mi * mi - 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});
        }
        sort(u.begin(), u.end());
        double lf, rt;
        lf = rt = -1;
        bool ok = true;
        for (int i = 0; i < u.size() && ok; ++i) {
            if (i == 0) {
                lf = u[i][0];
                rt = u[i][1];
            }
            else {
                if (u[i][0] > rt)
                    ok = false;
                rt = std::max(rt, u[i][1]);
            }
        }
        if (lf != 0 && rt != L)
            ok = false;
        if (ok) {
            hi = mi;
        }
        else {
            lo = mi;
        }
    }
    std::cout << lo << "\n";
    return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:44:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for (int i = 0; i < u.size() && ok; ++i) {
      |                         ~~^~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 312 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
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 #5
0 / 4.0

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

Subtask #6
0 / 5.0

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

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 18 ms 1104 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 1056 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 964 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 1832 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 1836 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 93 ms 2284 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 116 ms 2336 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 104 ms 2364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 143 ms 2336 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 122 ms 2248 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 164 ms 2316 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 137 ms 2340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 187 ms 2232 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 169 ms 2332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 232 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -