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Main13023.java
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Main13023.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.StringTokenizer;
public class Main13023 {
static int N,M,result=0;
static ArrayList<Integer>[] map;
static boolean[] visit;
public static void main(String[] args) throws NumberFormatException, IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
N = Integer.parseInt(st.nextToken());
M = Integer.parseInt(st.nextToken());
map = new ArrayList[N];
for(int i=0;i<N;i++) {
map[i] = new ArrayList<>();
}
visit = new boolean[N];
for(int i=0;i<M;i++) {
st = new StringTokenizer(br.readLine());
int a= Integer.parseInt(st.nextToken());
int b= Integer.parseInt(st.nextToken());
map[a].add(b);
map[b].add(a);
}
for(int i=0;i<N;i++) {
dfs(i,0);
if(result == 1) {
break;
}
}
System.out.println(result);
}
static void dfs(int idx,int cnt) {
if(result == 1) {
return;
}
if(cnt == 5) {
result = 1;
return;
}
for(int i=0;i<map[idx].size();i++) {
if(!visit[map[idx].get(i)]) {
visit[map[idx].get(i)]=true;
dfs(map[idx].get(i),cnt+1);
visit[map[idx].get(i)]=false;
}
}
}
}