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답안 #1056889

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1056889 2024-08-13T12:08:42 Z TimAni Mobile (BOI12_mobile) C++17
13 / 100
 1000 ms 23892 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const double eps = 1e-6;

struct point {
    int x{}, y{};
};

void solve() {
    int n, L;
    cin >> n >> L;
    vector<point> p(n);
    for(int i = 0; i < n; i++) {
        cin >> p[i].x >> p[i].y;
    }
    auto intersection = [&](const point& A, double R) -> array<double, 2> {
        if(abs(A.y) > R) {
            return {L, -1};
        }
        double D = 1.0 * R * R - 1.0 * A.y * A.y; // divided by 4
        double x1 = A.x - sqrt(D);
        double x2 = A.x + sqrt(D);
        if(x2 < x1) swap(x1, x2);
        return {x1, x2};
    };

    auto good = [&](double R) {
        vector<array<double, 2>> segs(n);
        for(int i = 0; i < n; i++) {
            segs[i] = intersection(p[i], R);
        }
        sort(segs.begin(), segs.end());
        double l = segs[0][0], r = segs[0][1];
        int i = 0;
        while(i + 1 < n && segs[i + 1][0] <= r) {
            r = max(segs[i + 1][1], r);
            i++;
        }
        return r >= L && l <= 0;
    };

    double l = 0, r = 4e9;
    while(r - l > eps) {
        double R = (r + l) / 2;
        if(good(R)) {
            r = R;
        }
        else {
            l = R;
        }
        
    }
    cout << fixed << setprecision(-log10(eps)) << r << endl;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    double T = 1;
    //cin >> T;
    while(T--) solve();
    return 0;
}

Compilation message

mobile.cpp: In lambda function:
mobile.cpp:22:21: warning: narrowing conversion of 'L' from 'int' to 'double' [-Wnarrowing]
   22 |             return {L, -1};
      |                     ^

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 3 ms 348 KB Output is correct
3 Incorrect 3 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 348 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 9 ms 348 KB Output is correct
4 Correct 8 ms 576 KB Output is correct

Subtask #5
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 9 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 348 KB Output is correct
2 Correct 9 ms 348 KB Output is correct
3 Correct 8 ms 348 KB Output is correct
4 Correct 9 ms 348 KB Output is correct
5 Correct 10 ms 576 KB Output is correct

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 188 ms 2136 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 208 ms 2196 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 111 ms 2544 KB Output is correct
2 Correct 204 ms 2628 KB Output is correct
3 Correct 206 ms 2436 KB Output is correct
4 Incorrect 209 ms 2652 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 191 ms 2796 KB Output is correct
2 Correct 269 ms 2652 KB Output is correct
3 Correct 236 ms 2652 KB Output is correct
4 Correct 224 ms 2652 KB Output is correct
5 Incorrect 256 ms 2792 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 143 ms 2648 KB Output is correct
2 Correct 270 ms 2796 KB Output is correct
3 Correct 248 ms 2648 KB Output is correct
4 Correct 211 ms 2784 KB Output is correct
5 Incorrect 218 ms 2652 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 699 ms 12180 KB Output is correct
2 Execution timed out 1043 ms 12176 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 1022 ms 12120 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 857 ms 14512 KB Output is correct
2 Execution timed out 1070 ms 14472 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 1029 ms 14512 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1055 ms 16792 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1014 ms 16788 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 1070 ms 19068 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 1078 ms 19068 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 1062 ms 23892 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 1055 ms 23888 KB Time limit exceeded
2 Halted 0 ms 0 KB -