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  1. /*
  2.  
  3. Find the longest word which is made of words.
  4.  
  5. list = test, tester, testertest, testing, testingtester, mytestingtesterprogram, testertestingtesting
  6. output = testertestingtesting
  7.  
  8. */
  9.  
  10. #include "bits/stdc++.h"
  11.  
  12. using namespace std;
  13.  
  14. bool isWordMadeOfOtherWords(unordered_set<string>& st, string& word, int index) {
  15. 	if (index >= word.size()) {
  16. 		return false;
  17. 	}
  18. 	if (index != 0 && (st.find(word.substr(index)) != st.end())) {
  19. 		return true;
  20. 	}
  21.  
  22. 	bool flag = false;
  23. 	for (int i=index+1;i<word.size();i++) {
  24. 		if (st.find(word.substr(index, i-index)) != st.end()) {
  25. 			if (isWordMadeOfOtherWords(st, word, i)) {
  26. 				flag = true;
  27. 				break;
  28. 			}
  29. 		}
  30. 	}
  31. 	return flag;
  32. }
  33.  
  34. string longestWordMadeOfOtherWords(vector<string>& wordlist) {
  35. 	unordered_set<string> st;
  36. 	for (auto word : wordlist) {
  37. 		st.insert(word);
  38. 	}
  39.  
  40. 	int maxlen = 0;
  41. 	string longest_word = "";
  42. 	for (auto word : wordlist) {
  43. 		if (maxlen < word.size() && isWordMadeOfOtherWords(st, word, 0)) {
  44. 			maxlen = word.size();
  45. 			longest_word = word;
  46. 		}
  47. 	}
  48. 	return longest_word;
  49. }
  50.  
  51. int main() {
  52. 	vector<string> wordlist = {"testingtest", "test", "testing", "testtesttest"};
  53. 	cout << longestWordMadeOfOtherWords(wordlist) << endl;
  54.  
  55. 	wordlist = {"test", "tester", "testertest", "testing", "testingtester", "mytestingtesterprogram", "testertestingtesting"};
  56.  
  57. 	cout << longestWordMadeOfOtherWords(wordlist) << endl;
  58. }
Success #stdin #stdout 0.01s 5440KB
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Standard input is empty
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testtesttest
testertestingtesting
https://ideone.com/mD7jnl
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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