oj.uz

Submission #732969

# Submission time Handle Problem Language Result Execution time Memory
732969 2023-04-29T22:31:14 Z williampsun Mobile (BOI12_mobile) Java 11
8 / 100
 1000 ms 131072 KB 
import java.io.*;
import java.util.*;

public class mobile {

    static int N;
    static int L;
    static int[][] coordinates;

    public static void main(String[] args) throws IOException {
        BufferedReader br;
        PrintWriter out;
        StringTokenizer st;
        try {
            br = new BufferedReader(new FileReader("highcard.in"));
            out = new PrintWriter(new BufferedWriter(new FileWriter("highcard.out")));
            st = new StringTokenizer(br.readLine());
        } catch (Exception e) {
            br = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
            st = new StringTokenizer(br.readLine());
        }

        N = Integer.parseInt(st.nextToken());
        L = Integer.parseInt(st.nextToken());

        coordinates = new int[N][2];
        for(int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            coordinates[i][0] = Integer.parseInt(st.nextToken());
            coordinates[i][1] = Integer.parseInt(st.nextToken());
        }

        double left = 0;
        double right = 1500000000;
        double answer = 0;
        do {
            double mid = (left + right) / 2;
            boolean working = works(mid);
            if (working) {
                answer = mid;
                left = mid;
            } else {
                right = mid;
            }
        } while (Math.abs(left - right) > 0.0001);

        out.print(answer);
        out.close();
    }

    static boolean works(double radius) {
        ArrayList<Intercept> intercepts = new ArrayList<>();
        for(int[] c : coordinates) {
            int h = c[0];
            int k = c[1];
            double discriminant = radius * radius - k * k;
            if(discriminant > 0) {
                double sqrt = Math.sqrt(discriminant);
                intercepts.add(new Intercept(sqrt + h, 1));
                intercepts.add(new Intercept(-sqrt + h, 2));
            } else if (discriminant == 0) {
                intercepts.add(new Intercept(h, 0));
            }
        }

        if(intercepts.size() == 0) {
            return true;
        }

        intercepts.sort(new Compare());
        int numCircles = 0;
        for (Intercept intercept : intercepts) {
            if (intercept.x >= 0 && intercept.x <= L) {
                if(numCircles == 0 || (numCircles == 1 && intercept.type == 2)) {
                    return true;
                }
            }

            if (intercept.type == 1) {
                numCircles++;
            } else if (intercept.type == 2) {
                numCircles--;
            }
        }

        return false;
    }

    static class Intercept {
        double x;
        int type;

        public Intercept(double x, int t) {
            this.x = x;
            type = t;
        }
    }

    static class Compare implements Comparator<Intercept> {
        @Override
        public int compare(Intercept o1, Intercept o2) {
            if(o1.x < o2.x) {
                return -1;
            } else if (o1.x == o2.x) {
                return 0;
            }
            return 1;
        }
    }
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 8828 KB Output is correct
2 Correct 69 ms 8608 KB Output is correct
3 Correct 66 ms 8440 KB Output is correct
4 Correct 65 ms 8516 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 118 ms 11252 KB Output is correct
2 Correct 112 ms 11076 KB Output is correct
3 Correct 123 ms 11108 KB Output is correct
4 Correct 140 ms 11644 KB Output is correct

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 444 ms 14748 KB Output is correct
2 Incorrect 525 ms 15224 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 513 ms 15168 KB Output is correct
2 Correct 427 ms 15092 KB Output is correct
3 Correct 722 ms 15764 KB Output is correct
4 Incorrect 580 ms 15848 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 594 ms 15212 KB Output is correct
2 Correct 434 ms 15268 KB Output is correct
3 Correct 677 ms 15680 KB Output is correct
4 Incorrect 603 ms 15488 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 602 ms 15188 KB Output is correct
2 Correct 429 ms 15072 KB Output is correct
3 Correct 760 ms 15636 KB Output is correct
4 Incorrect 647 ms 15464 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1075 ms 33228 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1067 ms 33004 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1077 ms 28188 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1060 ms 30568 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1073 ms 39876 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1041 ms 89244 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 1057 ms 82440 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 1020 ms 102624 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 1037 ms 88748 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 1037 ms 106688 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 1072 ms 106048 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 992 ms 131072 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1048 ms 97152 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 1037 ms 127120 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 1053 ms 125304 KB Time limit exceeded
2 Halted 0 ms 0 KB -