結果
| 問題 |
No.408 五輪ピック
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2016-08-06 02:34:49 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 958 ms / 5,000 ms |
| コード長 | 3,438 bytes |
| コンパイル時間 | 3,874 ms |
| コンパイル使用メモリ | 80,000 KB |
| 実行使用メモリ | 67,576 KB |
| 最終ジャッジ日時 | 2024-11-07 02:30:44 |
| 合計ジャッジ時間 | 19,013 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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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_1 {
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();
@SuppressWarnings("unchecked")
Set<Integer> edges[] = new Set[n];
// for (int i = 0; i < n; i++) {
// edges[i] = new HashSet<>();
// }
// 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;
int a = sc.nextInt() - 1;
int b = sc.nextInt() - 1;
// edges[a[i]].add(b[i]);
// edges[b[i]].add(a[i]);
if (edges[a] == null) {
edges[a] = new HashSet<>();
}
if (edges[b] == null) {
edges[b] = new HashSet<>();
}
edges[a].add(b);
edges[b].add(a);
}
Set<Integer>[] edges2 = new Set[n];
// for (int i = 1; i < n; i++) {
// edges2[i] = new HashSet<>();
// }
for (int e : edges[0]) {
for (int e2 : edges[e]) {
if (e2 != 0) {
if (edges2[e2] == null) {
edges2[e2] = new HashSet<>();
}
edges2[e2].add(e);
}
}
}
// for (int i = 0; i < m; i++) {
for (int i = 1; i < n; i++) {
for (int j : edges[i]) {
if (j == 0 || edges2[i] == null) {
continue;
}
for (int e : edges2[i]) {
if (e == 0 || edges2[j] == null) {
continue;
}
for (int e2 : edges2[j]) {
if (e2 == 0) {
continue;
}
if (e != e2 && e != j && e2 != i) {
pr.println("YES");
pr.close();
sc.close();
return;
}
}
}
/*
if (a[i] == 0 || b[i] == 0) {
continue;
}
for (int e : edges2[a[i]]) {
if (e == 0) {
continue;
}
for (int e2 : edges2[b[i]]) {
if (e2 == 0) {
continue;
}
if (e != e2 && e != b[i] && e2 != a[i]) {
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);
}
}
}