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Submission #732382

# Submission time Handle Problem Language Result Execution time Memory
732382 2023-04-29T03:15:22 Z uy842003 Mobile (BOI12_mobile) C++17
50 / 100
 1000 ms 48080 KB 
#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

const double eps = 1e-7;

bool cmp_less(double a, double b) {
    return a + eps < b;
}

bool cmp_less_equal(double a, double b) {
    return a < b + eps;
}

bool cmp_range(const pair<double, double> &p1, const pair<double, double> &p2) {
    return cmp_less(p1.first, p2.first);
}

bool inside(double l, double r, double m) {
    return cmp_less_equal(l, m) && cmp_less_equal(m, r);
}

int main() {

    int n;
    double len;
    cin >> n >> len;
    vector<pair<double, double>> cor(n);
    for (int i = 0; i < n; i++)
        cin >> cor[i].first >> cor[i].second;
    double l = 0, r = 2e9 + 7, m;
    while (cmp_less(l, r)) {
        m = (l + r) / 2;
        // cout << "@m " << m << endl;
        vector<pair<double, double>> range, real_range;
        for (int i = 0; i < n; i++) {
            if (cmp_less_equal(m, abs(cor[i].second))) continue;
            double dx = sqrt(m * m - cor[i].second * cor[i].second);
            range.push_back({cor[i].first - dx, cor[i].first + dx});
        }
        // cout << "dx ok" << endl;
        sort(range.begin(), range.end(), cmp_range);
        pair<double, double> cur_range = {-1, -1};
        if (range.size() > 0) cur_range = *range.begin();
        for (int i = 0; i < range.size(); i++) {
            if (inside(cur_range.first, cur_range.second, range[i].first) && cmp_less(cur_range.second, range[i].second))
                cur_range.second = range[i].second;
            if (!inside(cur_range.first, cur_range.second, range[i].first) || i + 1 == range.size()) {
                real_range.push_back(cur_range);
                cur_range = range[i];
            }
        }
        // cout << "real range ok" << endl;
        bool iok = false;
        for (int i = 0; i < real_range.size(); i++) {
            if (inside(real_range[i].first, real_range[i].second, 0) && inside(real_range[i].first, real_range[i].second, len)) {
                iok = true;
                break;
            }
        }
        if (iok)
            r = m;
        else
            l = m + eps;
        // cout << "check inside ok" << endl;
    }
    cout << setprecision(6) << fixed;
    cout << r << endl;

    return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for (int i = 0; i < range.size(); i++) {
      |                         ~~^~~~~~~~~~~~~~
mobile.cpp:50:85: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |             if (!inside(cur_range.first, cur_range.second, range[i].first) || i + 1 == range.size()) {
      |                                                                               ~~~~~~^~~~~~~~~~~~~~~
mobile.cpp:57:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         for (int i = 0; i < real_range.size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 444 KB Output is correct
2 Correct 8 ms 340 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 8 ms 468 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 580 KB Output is correct
2 Correct 20 ms 640 KB Output is correct
3 Correct 27 ms 636 KB Output is correct
4 Correct 13 ms 652 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 596 KB Output is correct
2 Correct 19 ms 592 KB Output is correct
3 Correct 25 ms 580 KB Output is correct
4 Correct 11 ms 580 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 580 KB Output is correct
2 Correct 19 ms 576 KB Output is correct
3 Correct 26 ms 580 KB Output is correct
4 Correct 12 ms 596 KB Output is correct
5 Correct 12 ms 628 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 273 ms 4844 KB Output is correct
2 Correct 435 ms 4960 KB Output is correct
3 Correct 295 ms 3684 KB Output is correct
4 Correct 178 ms 5912 KB Output is correct
5 Correct 134 ms 3300 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 211 ms 4816 KB Output is correct
2 Correct 201 ms 5404 KB Output is correct
3 Correct 200 ms 5936 KB Output is correct
4 Correct 184 ms 6036 KB Output is correct
5 Correct 181 ms 6540 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 406 ms 5188 KB Output is correct
2 Correct 486 ms 5020 KB Output is correct
3 Correct 671 ms 5988 KB Output is correct
4 Correct 187 ms 7424 KB Output is correct
5 Correct 237 ms 6076 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 557 ms 5616 KB Output is correct
2 Correct 616 ms 5572 KB Output is correct
3 Correct 817 ms 6564 KB Output is correct
4 Correct 181 ms 7436 KB Output is correct
5 Correct 251 ms 6752 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 476 ms 5608 KB Output is correct
2 Correct 602 ms 6900 KB Output is correct
3 Correct 849 ms 6676 KB Output is correct
4 Correct 179 ms 7424 KB Output is correct
5 Correct 256 ms 6768 KB Output is correct

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1078 ms 24196 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1077 ms 24180 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1067 ms 35860 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1070 ms 35520 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1079 ms 38684 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1081 ms 38648 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1054 ms 41936 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1073 ms 29300 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1069 ms 48080 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1071 ms 15956 KB Time limit exceeded
2 Halted 0 ms 0 KB -