oj.uz

Submission #732970

# Submission time Handle Problem Language Result Execution time Memory
732970 2023-04-29T22:44:14 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) > 0.00001);

        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 74 ms 8612 KB Output is correct
2 Correct 66 ms 8564 KB Output is correct
3 Correct 67 ms 8672 KB Output is correct
4 Correct 70 ms 8560 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 11260 KB Output is correct
2 Correct 108 ms 11184 KB Output is correct
3 Correct 125 ms 11496 KB Output is correct
4 Correct 147 ms 11704 KB Output is correct

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 391 ms 14748 KB Output is correct
2 Incorrect 558 ms 15296 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 526 ms 15076 KB Output is correct
2 Correct 438 ms 15080 KB Output is correct
3 Correct 705 ms 15620 KB Output is correct
4 Incorrect 552 ms 15792 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 574 ms 15072 KB Output is correct
2 Correct 424 ms 15248 KB Output is correct
3 Correct 646 ms 15508 KB Output is correct
4 Incorrect 598 ms 15588 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 603 ms 15208 KB Output is correct
2 Correct 438 ms 15172 KB Output is correct
3 Correct 748 ms 15576 KB Output is correct
4 Incorrect 641 ms 15596 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 1060 ms 32560 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 1075 ms 32340 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 1066 ms 27864 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 1074 ms 29056 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 1070 ms 38484 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 1072 ms 86396 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 1068 ms 78060 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 1057 ms 99140 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 1066 ms 84224 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 102360 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 1080 ms 101668 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 926 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 1066 ms 91940 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 1004 ms 131072 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 1074 ms 119456 KB Time limit exceeded
2 Halted 0 ms 0 KB -