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답안 #990607

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
990607 2024-05-30T17:11:35 Z Ska Mobile (BOI12_mobile) C++14
50 / 100
 1000 ms 63508 KB 
#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e6 + 5;
 
int n;
double m;
double x[N], y[N];
 
pair<double, double> calc(double r, int i) {
    if (r < abs(y[i])) {
        return {-1, -1};
    }
    return {x[i] - sqrt(r * r - y[i] * y[i]), x[i] + sqrtl(r * r - y[i] * y[i])};
}
 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    double l = 2e9, r = 1.5e9;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i] >> y[i];
        l = min(l, abs(y[i]));
    }
    while (r - l >= 1e-3) {
        vector<pair<double, double>> segments;
        double mid = (l + r) / 2;
        for (int i = 1; i <= n; ++i) {
            auto x = calc(mid, i);
            if (x.first != -1 || x.second != -1) {
                segments.emplace_back(x.first, x.second);
            }
        }
        sort(segments.begin(), segments.end());
        double bound = 0;
        for (auto x : segments) {
            if (x.first > bound) {
                break;
            }
            bound = max(bound, x.second);
            if (bound >= m) {
                break;
            }
        }
        if (bound >= m) {
            r = mid;
        } else {
            l = mid;
        }
    }
    cout << fixed << setprecision(6) << l << '\n';
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2648 KB Output is correct
2 Correct 3 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 3 ms 2648 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 2780 KB Output is correct
2 Correct 7 ms 2780 KB Output is correct
3 Correct 9 ms 2776 KB Output is correct
4 Correct 5 ms 2764 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 2764 KB Output is correct
2 Correct 6 ms 2776 KB Output is correct
3 Correct 12 ms 2924 KB Output is correct
4 Correct 5 ms 2748 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 2764 KB Output is correct
2 Correct 8 ms 2776 KB Output is correct
3 Correct 10 ms 2764 KB Output is correct
4 Correct 5 ms 2764 KB Output is correct
5 Correct 7 ms 2760 KB Output is correct

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 107 ms 10116 KB Output is correct
2 Correct 192 ms 10064 KB Output is correct
3 Correct 120 ms 6872 KB Output is correct
4 Correct 87 ms 10008 KB Output is correct
5 Correct 78 ms 6572 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 114 ms 10092 KB Output is correct
2 Correct 104 ms 8112 KB Output is correct
3 Correct 108 ms 10116 KB Output is correct
4 Correct 93 ms 10060 KB Output is correct
5 Correct 88 ms 10168 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 137 ms 10316 KB Output is correct
2 Correct 217 ms 10148 KB Output is correct
3 Correct 249 ms 10176 KB Output is correct
4 Correct 79 ms 10252 KB Output is correct
5 Correct 132 ms 10216 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 210 ms 10452 KB Output is correct
2 Correct 279 ms 10428 KB Output is correct
3 Correct 304 ms 10420 KB Output is correct
4 Correct 74 ms 10160 KB Output is correct
5 Correct 135 ms 10404 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 152 ms 10468 KB Output is correct
2 Correct 274 ms 10924 KB Output is correct
3 Correct 304 ms 10488 KB Output is correct
4 Correct 76 ms 10656 KB Output is correct
5 Correct 131 ms 10436 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 677 ms 30220 KB Output is correct
2 Execution timed out 1025 ms 34616 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1074 ms 33336 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 869 ms 45144 KB Output is correct
2 Execution timed out 1038 ms 51532 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1059 ms 50384 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 986 ms 47500 KB Output is correct
2 Execution timed out 1040 ms 54128 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1049 ms 52632 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1065 ms 50196 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1056 ms 55840 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1044 ms 56600 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1056 ms 63508 KB Time limit exceeded
2 Halted 0 ms 0 KB -