結果
問題 |
No.408 五輪ピック
|
ユーザー |
|
提出日時 | 2016-08-06 10:00:16 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 596 ms / 5,000 ms |
コード長 | 2,869 bytes |
コンパイル時間 | 4,738 ms |
コンパイル使用メモリ | 80,348 KB |
実行使用メモリ | 56,780 KB |
最終ジャッジ日時 | 2024-11-07 02:57:22 |
合計ジャッジ時間 | 17,594 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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ファイルパターン | 結果 |
---|---|
other | AC * 32 |
ソースコード
import java.io.*; import java.util.*; public class Main_yukicoder408_2 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); Printer pr = new Printer(System.out); int n = sc.nextInt(); int m = sc.nextInt(); List<List<Integer>> edges = new ArrayList<>(n); for (int i = 0; i < n; i++) { edges.add(null); } int[] a = new int[m]; int[] b = new int[m]; for (int i = 0; i < m; i++) { a[i] = sc.nextInt() - 1; b[i] = sc.nextInt() - 1; if (edges.get(a[i]) == null) { edges.set(a[i], new ArrayList<>()); } if (edges.get(b[i]) == null) { edges.set(b[i], new ArrayList<>()); } edges.get(a[i]).add(b[i]); edges.get(b[i]).add(a[i]); } List<List<Integer>> edges2 = new ArrayList<>(n); for (int i = 0; i < n; i++) { edges2.add(null); } for (int e : edges.get(0)) { for (int e2 : edges.get(e)) { if (e2 != 0) { if (edges2.get(e2) == null) { edges2.set(e2, new ArrayList<>(edges.get(e2).size())); } edges2.get(e2).add(e); } } } for (int i = 1; i < m; i++) { int ii = a[i]; int jj = b[i]; if (ii == 0 || jj == 0 || edges2.get(ii) == null || edges2.get(jj) == null) { continue; } for (int e : edges2.get(ii)) { if (e == 0) { continue; } for (int e2 : edges2.get(jj)) { if (e2 == 0) { continue; } if (e != e2 && e != jj && e2 != ii) { pr.println("YES"); pr.close(); sc.close(); return; } } } } pr.println("NO"); pr.close(); sc.close(); } @SuppressWarnings("unused") private static class Scanner { BufferedReader br; Iterator<String> it; Scanner (InputStream in) { br = new BufferedReader(new InputStreamReader(in), 128); } String next() throws RuntimeException { try { if (it == null || !it.hasNext()) { // it = Arrays.asList(br.readLine().split(" ")).iterator(); it = Arrays.asList(br.readLine().split("\\p{javaWhitespace}+")).iterator(); } return it.next(); } catch (IOException e) { throw new IllegalStateException(); } } int nextInt() throws RuntimeException { return Integer.parseInt(next()); } long nextLong() throws RuntimeException { return Long.parseLong(next()); } float nextFloat() throws RuntimeException { return Float.parseFloat(next()); } double nextDouble() throws RuntimeException { return Double.parseDouble(next()); } void close() { try { br.close(); } catch (IOException e) { // throw new IllegalStateException(); } } } private static class Printer extends PrintWriter { Printer(PrintStream out) { super(out); } } }