Package g0701_0800.s0745_prefix_and_suffix_search

Class WordFilter

java.lang.Object
g0701_0800.s0745_prefix_and_suffix_search.WordFilter
public class WordFilter extends Object
745 - Prefix and Suffix Search.

Hard

Design a special dictionary with some words that searchs the words in it by a prefix and a suffix.

Implement the WordFilter class:

  • WordFilter(string[] words) Initializes the object with the words in the dictionary.
  • f(string prefix, string suffix) Returns the index of the word in the dictionary, which has the prefix prefix and the suffix suffix. If there is more than one valid index, return the largest of them. If there is no such word in the dictionary, return -1.

Example 1:

Input

[“WordFilter”, “f”]

[[[“apple”]], [“a”, “e”]]

Output: [null, 0]

Explanation:

 WordFilter wordFilter = new WordFilter(["apple"]); 
 wordFilter.f("a", "e"); // return 0, because the word at index 0 has prefix = "a" and suffix = 'e".

Constraints:

  • 1 <= words.length <= 15000
  • 1 <= words[i].length <= 10
  • 1 <= prefix.length, suffix.length <= 10
  • words[i], prefix and suffix consist of lower-case English letters only.
  • At most 15000 calls will be made to the function f.

  • Constructor Details

    • WordFilter

      public WordFilter(String[] words)

  • Method Details

    • insert

      public void insert(String wd, int weight)

    • f

      public int f(String prefix, String suffix)

    • startsWith

      public int startsWith(String pref)