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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5.  
  6. class Ideone
  7. {
  8. 	static int t1,t2;
  9. 	static boolean arrive = false;  //깊이가 5가 될 경우 true
  10. 	static ArrayList<Integer>[] graph;
  11. 	static boolean[] visited;
  12.  
  13.  
  14. 	private static void dfs(int n , int depth){
  15. 		if(depth == 5 || arrive){
  16. 			arrive = true;
  17. 			return;	
  18. 		} 
  19. 		visited[n] = true;
  20.  
  21. 		for(int i : graph[n]){
  22. 		 if(!visited[n]){
  23. 			dfs(i,depth+1);
  24. 			}
  25. 		}
  26. 		visited[n] = false;
  27. 	}
  28.  
  29.  
  30. 	public static void main (String[] args) throws java.lang.Exception
  31. 	{
  32. 		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  33. 	    StringTokenizer st = new StringTokenizer(br.readLine());
  34.  
  35. 	    t1 = Integer.parseInt(st.nextToken());
  36. 	    t2 = Integer.parseInt(st.nextToken());
  37.  
  38. 		graph = new ArrayList[t1];
  39. 		visited = new boolean[t1];
  40.  
  41. 		for(int i=0; i< t1;i++){
  42. 			graph[i] = new ArrayList<Integer>(); 
  43. 		}
  44.  
  45. 		for(int i=0;i<t2;i++){
  46. 			st = new StringTokenizer(br.readLine());
  47. 			int u = Integer.parseInt(st.nextToken());
  48. 	    	int v = Integer.parseInt(st.nextToken());
  49.  
  50. 	    	//쌍방향
  51. 	    	graph[u].add(v);
  52. 	    	graph[v].add(u);
  53. 		}
  54.  
  55. 		for(int i=0;i<t1;i++){
  56. 			dfs(i,1);
  57. 		}
  58.  
  59. 		if(arrive){
  60. 			System.out.println("1");
  61. 		}
  62. 		else System.out.println("0");
  63.  
  64. 		/*
  65. 		//출력
  66. 		for (int i = 0; i < t1; i++) {
  67.             System.out.print("graph[" + i + "] -> ");
  68.             for (int j : graph[i]) {
  69.                 System.out.print(j + " ");
  70.             }
  71.             System.out.println();
  72.         }
  73.         */
  74.  
  75.  
  76. 	}
  77. }
Success #stdin #stdout 0.08s 52976KB
comments (?)
stdin 
8 8
1 7
3 7
4 7
3 4
4 6
3 5
0 4
2 7
stdout 
0
https://ideone.com/LpI86a
language:
Java (HotSpot 12)
created:
10 days ago
visibility:
public

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