Package g0701_0800.s0745_prefix_and_suffix_search

Class 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 Detail

      • WordFilter

        public WordFilter​(String[] words)

    • Method Detail

      • insert

        public void insert​(String wd,
                   int weight)

      • startsWith

        public int startsWith​(String pref)