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  1. import java.util.ArrayList; 
  2.  
  3. public class GFG { 
  4.  
  5.     // String array to store keypad characters 
  6.     static final String codes[] 
  7.         = { " ", "abc", "def", 
  8.             "ghi", "jkl", "mno", 
  9.             "pqr", "stu", "vwx", 
  10.             "yz" }; 
  11.  
  12.     // Function that returns an Arraylist 
  13.     // which contains all the generated words 
  14.     public static ArrayList<String> printKeyWords(String str) 
  15.     { 
  16.  
  17.         // If str is empty 
  18.         if (str.length() == 0) { 
  19.             ArrayList<String> baseRes = new ArrayList<>(); 
  20.             baseRes.add(""); 
  21.  
  22.             // Return an Arraylist containing 
  23.             // empty string 
  24.             return baseRes; 
  25.         } 
  26.  
  27.         // First character of str 
  28.         char ch = str.charAt(0); 
  29.  
  30.         // Rest of the characters of str 
  31.         String restStr = str.substring(1); 
  32.  
  33.         ArrayList<String> prevRes = printKeyWords(restStr); 
  34.         ArrayList<String> Res = new ArrayList<>(); 
  35.  
  36.         String code = codes[ch - '0']; 
  37.  
  38.         for (String val : prevRes) { 
  39.  
  40.             for (int i = 0; i < code.length(); i++) { 
  41.                 Res.add(code.charAt(i) + val); 
  42.             } 
  43.         } 
  44.         return Res; 
  45.     } 
  46.  
  47.     // Driver code 
  48.     public static void main(String[] args) 
  49.     { 
  50.         String str = "23"; 
  51.  
  52.         // Print all the possible words 
  53.         System.out.println(printKeyWords(str)); 
  54.     } 
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:1:1: error: ‘import’ does not name a type; did you mean ‘short’?
 import java.util.ArrayList;
 ^~~~~~
 short
prog.cpp:3:1: error: expected unqualified-id before ‘public’
 public class GFG {
 ^~~~~~
stdout
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Standard output is empty
https://ideone.com/u7jsGC
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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