結果
問題 | No.94 圏外です。(EASY) |
ユーザー |
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提出日時 | 2019-12-06 08:37:38 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 257 ms / 5,000 ms |
コード長 | 2,999 bytes |
コンパイル時間 | 2,882 ms |
コンパイル使用メモリ | 82,180 KB |
実行使用メモリ | 44,108 KB |
最終ジャッジ日時 | 2024-12-23 04:58:04 |
合計ジャッジ時間 | 7,972 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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ファイルパターン | 結果 |
---|---|
other | AC * 22 |
ソースコード
import java.util.*;public class Main {public static void main (String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();if (n == 0) {System.out.println(1);return;}Point[] points = new Point[n];for (int i = 0; i < n; i++) {points[i] = new Point(sc.nextInt(), sc.nextInt());}Arrays.sort(points);UnionFindTree uft = new UnionFindTree(n);for (int i = 0; i < n - 1; i++) {for (int j = i + 1; j < n; j++) {if (points[j].x - points[i].x > 10) {break;}if (points[i].distance2(points[j]) <= 100) {uft.unite(i, j);}}}int max = 0;HashMap<Integer, ArrayList<Integer>> map = uft.getMap();for (ArrayList<Integer> list : map.values()) {for (int i = 0; i < list.size() - 1; i++) {for (int j = i + 1; j < list.size(); j++) {max = Math.max(max, points[list.get(i)].distance2(points[list.get(j)]));}}}System.out.println(Math.sqrt(max) + 2);}static class UnionFindTree {int[] parents;public UnionFindTree(int size) {parents = new int[size];for (int i = 0; i < size; i++) {parents[i] = i;}}public int find(int x) {if (x == parents[x]) {return x;} else {return parents[x] = find(parents[x]);}}public void unite(int x, int y) {int xx = find(x);int yy = find(y);if (xx == yy) {return;}parents[xx] = yy;}public HashMap<Integer, ArrayList<Integer>> getMap() {HashMap<Integer, ArrayList<Integer>> ret = new HashMap<>();for (int i = 0; i < parents.length; i++) {int x = find(i);if (ret.containsKey(x)) {ret.get(x).add(i);} else {ArrayList<Integer> list = new ArrayList<>();list.add(i);ret.put(x, list);}}return ret;}public String toString() {StringBuilder sb = new StringBuilder();for (int x : parents) {sb.append(x).append(" ");}return sb.toString();}}static class Point implements Comparable<Point> {int x;int y;public Point(int x, int y) {this.x = x;this.y = y;}public int compareTo(Point another) {if (x == another.x) {return y - another.y;} else {return x - another.x;}}public int distance2(Point another) {return (x - another.x) * (x - another.x) + (y - another.y) * (y - another.y);}}}