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Submission #633259

# Submission time Handle Problem Language Result Execution time Memory
633259 2022-08-22T02:35:15 Z afatpotato Mobile (BOI12_mobile) C++14
0 / 100
 1000 ms 56804 KB 
#include <bits/stdc++.h>

using namespace std;

bool solve(double x);

vector<pair<double, double> > tower;
long long n, l;

int main() {
    cin >> n >> l;
    tower.resize(n);
    for (int i = 0; i < n; i++) {
        cin >> tower[i].first >> tower[i].second;
    }
    double low = 0;
    double high = 4e9;
    double ans = 0;

    while (high - low > 1e-4) {
        double mid = (low + high) / 2;
        if (solve(mid)) {
            ans = mid;
            high = mid;
        } else {
            low = mid;
        }
    }
    cout << fixed;
    cout << setprecision(9);
    cout << ans << endl;
}

bool solve(double x) {
    vector<pair<double, double> > v;
    for (int i = 0; i < n; i++) {


        if (tower[i].second > x) {
            continue;
        }

        double d = sqrt(x * x - tower[i].second * tower[i].second);
        if (tower[i].first + d < 0) {
            continue;
        }

        v.push_back(make_pair(max(tower[i].first - d, (double) 0), max(tower[i].first + d, (double) 0)));
    }

    sort(v.begin(), v.end());
    if (v[0].first > 0) {
        return false;
    }
    double r = v[0].second;
    for (int i = 1; i < v.size(); i++) {
        if (r < v[i].first) {
            return false;
        } else {
            r = max(r, v[i].second);
        }
    }
    if (r < l) {
        return false;
    }
    return true;
}

Compilation message

mobile.cpp: In function 'bool solve(double)':
mobile.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for (int i = 1; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 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 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 13 ms 632 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 13 ms 624 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 9 ms 904 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 139 ms 7516 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 265 ms 5572 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 281 ms 5812 KB Output is correct
2 Correct 351 ms 6232 KB Output is correct
3 Correct 366 ms 5988 KB Output is correct
4 Incorrect 305 ms 7420 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 346 ms 7132 KB Output is correct
2 Correct 457 ms 7052 KB Output is correct
3 Correct 460 ms 6540 KB Output is correct
4 Incorrect 322 ms 7556 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 213 ms 6988 KB Output is correct
2 Correct 442 ms 6912 KB Output is correct
3 Correct 485 ms 6548 KB Output is correct
4 Incorrect 265 ms 7432 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1089 ms 28488 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 1069 ms 32560 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 1090 ms 40804 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 1065 ms 45424 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 1083 ms 44888 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 1092 ms 50344 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 1093 ms 48872 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 1079 ms 54928 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 1096 ms 56804 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 1089 ms 49076 KB Time limit exceeded
2 Halted 0 ms 0 KB -