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path: root/prefix_suffix_search.cpp
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#include "leetcode.h"

class WordFilter {
public:
  WordFilter(vector<string> &words) {
    int n = words.size();
    for (int i = 0; i < n; i++) {
      string word = words[i];
      int wordSize = word.size();
      for (int j = 1; j <= wordSize; j++) {
        string p = word.substr(0, j);
        for (int k = 0; k < wordSize; k++) {
          string s = word.substr(k, wordSize);
          hashMap[p + '|' + s] = i + 1;
        }
      }
    }
  }
  int f(string prefix, string suffix) {
    string s = prefix + '|' + suffix;
    return hashMap[s] - 1;
  }

private:
  unordered_map<string, int> hashMap;
};