oj.uz

답안 #732159

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
732159 2023-04-28T14:26:56 Z williampsun Mobile (BOI12_mobile) Java 11
21 / 100
 1000 ms 131072 KB 
import java.io.*;
import java.util.*;

public class mobile {

    static int N;
    static int L;
    static ArrayList<Coordinate> 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 ArrayList<>();
        for(int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            coordinates.add(new Coordinate(Integer.parseInt(st.nextToken()), Integer.parseInt(st.nextToken())));
        }

        double left = 0;
        double right = Integer.MAX_VALUE;
        double answer = 0;
        do {
//            System.out.println(left + " " + right);
            double mid = (left + right) / 2;
            boolean working = works(mid);
            if (working) {
                answer = mid;
                left = mid;
            } else {
                right = mid;
            }
        } while (Math.abs(left - right) > 0.001);

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

    static boolean works(double radius) {
        ArrayList<Intercept> intercepts = new ArrayList<>();
        int id = 0;
        for(Coordinate c : coordinates) {
            double[] theseInter = getIntercepts(c.x, c.y, radius);
            if(theseInter.length == 2) {
                intercepts.add(new Intercept(Math.min(theseInter[0], theseInter[1]), 1, id));
                intercepts.add(new Intercept(Math.max(theseInter[0], theseInter[1]), 2, id));
                id++;
            } else if (theseInter.length == 1) {
                intercepts.add(new Intercept(theseInter[0], 0, id));
                id++;
            }
        }

        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 intercepts.size() == 0;
    }

    static double[] getIntercepts(double h, double k, double radius) {
        if(radius * radius - k * k > 0) {
            double sqrt = Math.sqrt(radius * radius - k * k);
            return new double[] {sqrt + h, -sqrt + h};
        } else if (radius * radius - k * k == 0) {
            return new double[] {h};
        } else {
            return new double[] {};
        }
    }

    static class Coordinate {
        int x;
        int y;

        public Coordinate(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    static class Intercept {
        double x;
        int type;
        int id;

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

    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
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 90 ms 8600 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 159 ms 12012 KB Output is correct
2 Correct 142 ms 12160 KB Output is correct
3 Correct 153 ms 12244 KB Output is correct
4 Correct 148 ms 12396 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 531 ms 15164 KB Output is correct
2 Correct 662 ms 15172 KB Output is correct
3 Correct 462 ms 15328 KB Output is correct
4 Correct 604 ms 15296 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 611 ms 15600 KB Output is correct
2 Correct 502 ms 15256 KB Output is correct
3 Correct 771 ms 15500 KB Output is correct
4 Correct 648 ms 15796 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 680 ms 15504 KB Output is correct
2 Correct 478 ms 15452 KB Output is correct
3 Correct 754 ms 15640 KB Output is correct
4 Correct 552 ms 15580 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 741 ms 15988 KB Output is correct
2 Correct 454 ms 15492 KB Output is correct
3 Correct 772 ms 15748 KB Output is correct
4 Correct 522 ms 15532 KB Output is correct
5 Correct 628 ms 15924 KB Output is correct

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1061 ms 36436 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1063 ms 37708 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1057 ms 40524 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1058 ms 42400 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1057 ms 30448 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1030 ms 89860 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1043 ms 69624 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 964 ms 131072 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1022 ms 79424 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 1048 ms 121168 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 1083 ms 103800 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 1057 ms 112572 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 1065 ms 108164 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 1055 ms 131072 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 1086 ms 131072 KB Time limit exceeded
2 Halted 0 ms 0 KB -