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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  13. 		String s = br.readLine();
  14. 		String[] s1 = s.split(" ");
  15. 		int N = Integer.parseInt(s1[0]); // N -> target number 
  16. 		int n = Integer.parseInt(s1[1]); // n -> size of the array
  17. 		String s2 = br.readLine();
  18. 		int[] arr = new int[n];
  19. 		String[] s3 = s2.split(" ");
  20. 		for (int i = 0; i < n; i++) {
  21. 			arr[i] = Integer.parseInt(s3[i]);
  22. 		} 
  23. 		ArrayList<Integer> ans = reachN(N, arr);
  24.  
  25. 		int ans_len = ans.size();
  26. 		for(int i = ans_len - 1; i>=0; i--){
  27. 			System.out.print(ans.get(i) + " ");
  28. 		}
  29. 	}
  30. 	public static ArrayList<Integer> reachN(int N, int[] arr){
  31. 		ArrayList<Integer> ans = new ArrayList<>();		
  32.  
  33. 		if(N == 1){ // no multiplications are required
  34. 			return ans;
  35. 		}		
  36.  
  37. 		Arrays.sort(arr); // for lexicographical order
  38.  
  39. 		int n = arr.length;
  40.  
  41. 		for(int i=n-1; i>=0; i--){
  42. 			if(N == 1){
  43. 				break;
  44. 			}
  45.  			while(N!=1 && N % arr[i] == 0){ // adding N to the answer 
  46. 				ans.add(arr[i]);
  47. 				N = N / arr[i];
  48. 			}
  49. 		}
  50.  
  51. 		if(N != 1){ // target has not been reached
  52. 			ans = new ArrayList<>();
  53. 			ans.add(-1);
  54. 		}else{			
  55. 			ans.add(1); // adding 1 to the answer if product goes from 1 to N
  56. 		} 
  57. 		return ans;
  58. 	}
  59.  
  60. }
Success #stdin #stdout 0.09s 36212KB
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https://ideone.com/NFc3Uk
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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