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  1. #include <string>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8. 	string sample = "aabaa";
  9. 	string text = "aabaabaaaabaabaaab";
  10. 	vector<size_t> prefix(sample.length());
  11.  
  12. 	size_t last_prefix = prefix[0] = 0;
  13. 	for (size_t i=1; i<sample.length(); i++) {
  14. 		while (last_prefix > 0 && sample[last_prefix] != sample[i])
  15. 			last_prefix = prefix[last_prefix-1];
  16.  
  17. 		if (sample[last_prefix] == sample[i])
  18. 			last_prefix++;
  19.  
  20. 		prefix[i] = last_prefix;
  21. 	}
  22.  
  23. 	last_prefix = 0;
  24. 	for (size_t i=0; i<text.length(); i++) {
  25. 		while (last_prefix > 0 && sample[last_prefix] != text[i])
  26. 			last_prefix = prefix[last_prefix-1];
  27.  
  28. 		if (sample[last_prefix] == text[i])
  29. 			last_prefix++;
  30.  
  31. 		if (last_prefix == sample.length()) {
  32. 			cout << i + 1 - sample.length() << endl;
  33. 		}
  34. 	}
  35. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/qmNQ39
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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