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 01:40:30 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 917 ms / 5,000 ms |
| コード長 | 2,534 bytes |
| コンパイル時間 | 4,591 ms |
| コンパイル使用メモリ | 79,884 KB |
| 実行使用メモリ | 59,520 KB |
| 最終ジャッジ日時 | 2024-11-07 01:54:21 |
| 合計ジャッジ時間 | 19,011 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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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();
List<List<Integer>> edges = new ArrayList<>(n);
for (int i = 0; i < n; i++) {
edges.add(new ArrayList<>());
}
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;
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(new ArrayList<>());
}
for (int e : edges.get(0)) {
for (int e2 : edges.get(e)) {
if (e2 != 0) {
edges2.get(e2).add(e);
}
}
}
for (int i = 0; i < m; i++) {
if (a[i] == 0 || b[i] == 0) {
continue;
}
for (int e : edges2.get(a[i])) {
if (e == 0) {
continue;
}
for (int e2 : edges2.get(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));
}
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);
}
}
}