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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) {
  11. 		final Ideone l = new Ideone();
  12. 		System.out.println(l.calculateLevenshteinDistance("cat", "hat"));
  13. 	}
  14.  
  15. 	public int calculateLevenshteinDistance(String first, String second) {
  16.  
  17. 		char[] s = first.toCharArray();
  18. 		char[] t = second.toCharArray();
  19. 		int substitutionCost = 0;
  20.  
  21. 		int m = first.length();
  22. 		int n = second.length();
  23.  
  24. 		int[][] array = new int[m + 1][n + 1];
  25.  
  26. 		for (int i = 1; i <= m; i++) {
  27. 			array[i][0] = i;
  28. 		}
  29.  
  30. 		for (int j = 1; j <= n; j++) {
  31.  
  32. 			array[0][j] = j;
  33. 		}
  34.  
  35. 		for (int j = 1; j <= n; j++) {
  36. 			for (int i = 1; i <= m; i++) {
  37. 				if (s[i - 1] == t[j - 1]) {
  38. 					substitutionCost = 0;
  39. 				} else {
  40. 					substitutionCost = 1;
  41. 				}
  42.  
  43. 				int deletion = array[i - 1][j] + 1;
  44. 				int insertion = array[i][j - 1] + 1;
  45. 				int substitution = array[i - 1][j - 1] + substitutionCost;
  46. 				int cost = Math.min(
  47. 						deletion,
  48. 						Math.min(
  49. 								insertion,
  50. 								substitution));
  51. 				array[i][j] = cost;
  52. 			}
  53. 		}
  54.  
  55. 		return array[m][n];
  56. 	}
  57.  
  58. }
Success #stdin #stdout 0.09s 27740KB
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https://ideone.com/IDGS4f
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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