結果
問題 | No.826 連絡網 |
ユーザー |
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提出日時 | 2023-11-16 08:41:26 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 145 ms / 2,000 ms |
コード長 | 2,757 bytes |
コンパイル時間 | 2,963 ms |
コンパイル使用メモリ | 91,772 KB |
実行使用メモリ | 49,580 KB |
最終ジャッジ日時 | 2024-09-26 05:02:19 |
合計ジャッジ時間 | 6,961 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 30 |
ソースコード
import java.io.*;import java.util.*;import java.util.stream.*;public class Main {public static void main(String[] args) throws Exception {Scanner sc = new Scanner();int n = sc.nextInt();int p = sc.nextInt();UnionFindTree uft = new UnionFindTree(n + 1);boolean[] isNotPrimes = new boolean[n + 1];for (int i = 2; i <= n; i++) {if (!isNotPrimes[i]) {for (int j = 2; j * i <= n; j++) {isNotPrimes[j * i] = true;uft.unite(i, j * i);}}}System.out.println(uft.getCount(p));}static class UnionFindTree {int[] parents;int[] counts;public UnionFindTree(int size) {parents = new int[size];counts = new int[size];for (int i = 0; i < size; i++) {parents[i] = i;counts[i] = 1;}}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) {parents[yy] = xx;counts[xx] += counts[yy];}}public int getCount(int x) {return counts[find(x)];}}}class Utilities {static String arrayToLineString(Object[] arr) {return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));}static String arrayToLineString(int[] arr) {return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));}}class Scanner {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));StringTokenizer st = new StringTokenizer("");StringBuilder sb = new StringBuilder();public Scanner() throws Exception {}public int nextInt() throws Exception {return Integer.parseInt(next());}public long nextLong() throws Exception {return Long.parseLong(next());}public double nextDouble() throws Exception {return Double.parseDouble(next());}public int[] nextIntArray() throws Exception {return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();}public String next() throws Exception {while (!st.hasMoreTokens()) {st = new StringTokenizer(br.readLine());}return st.nextToken();}}