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ABCDE.java
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ABCDE.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
public class ABCDE {
private static Node[] resultArr;
private static final int TARGET_CONNECTION_COUNT = 5;
private static int CONNECTION_COUNT;
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine(), " ");
int N = Integer.parseInt(st.nextToken());
int M = Integer.parseInt(st.nextToken());
initResultArr(N);
for(int i = 0; i < M; i++) {
st = new StringTokenizer(br.readLine(), " ");
int from = Integer.parseInt(st.nextToken()) + 1;
int to = Integer.parseInt(st.nextToken()) + 1;
resultArr[from].getLinks().add(to);
resultArr[to].getLinks().add(from);
}
printResult(N);
}
private static void initResultArr(int length) {
resultArr = new Node[length + 1];
for(int i = 1; i < resultArr.length; i++) {
resultArr[i] = new Node(i);
}
}
private static boolean checkValidation(int totalPerson) {
for(int personNumber = 1; personNumber <= totalPerson; personNumber++) {
boolean[] visitArr = new boolean[resultArr.length];
CONNECTION_COUNT = 0;
getConnectionCount(visitArr, personNumber, 0);
if(CONNECTION_COUNT >= TARGET_CONNECTION_COUNT) return true;
}
return false;
}
private static void getConnectionCount(boolean[] visitArr, int currentNumber, int count) {
if(CONNECTION_COUNT >= TARGET_CONNECTION_COUNT) return;
if(count >= TARGET_CONNECTION_COUNT) {
CONNECTION_COUNT = TARGET_CONNECTION_COUNT;
return;
}
for(int nextIndex : resultArr[currentNumber].getLinks()) {
if(!visitArr[nextIndex]) {
visitArr[nextIndex] = true;
getConnectionCount(visitArr, nextIndex, count + 1);
visitArr[nextIndex] = false;
}
}
}
private static void printResult(int totalPerson) {
if(checkValidation(totalPerson)) {
System.out.println(1);
return;
}
System.out.println(0);
}
private static class Node {
private int number;
private List<Integer> links;
public Node(int number) {
this.number = number;
this.links = new ArrayList<>();
}
public int getNumber() {
return this.number;
}
public List<Integer> getLinks() {
return this.links;
}
}
}