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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int hashing(int p, string st, int start, int end) {
  5. 	long long hash = 0;
  6. 	for (int i = start; i <= end; i++)
  7. 		hash = (hash * 32 + (st[i] - 'a' + 1)) % p;
  8. 	return hash;
  9. }
  10.  
  11. //151527006
  12. //tpj
  13. //jnm
  14.  
  15. //354924896
  16. //cwugbhvaqobsbohekgyvrqjcjipcuwu
  17. //sbo
  18.  
  19. int main() {
  20. 	ios::sync_with_stdio(false);
  21. 		cin.tie(nullptr);
  22. 	cout.tie(nullptr);
  23. 	int p;
  24. 	string s, t;
  25. 	cin >> p;
  26. 	cin >> s;
  27. 	cin >> t;
  28.  
  29. 	int h2 = hashing(p, t, 0, t.size() - 1);
  30. 	bool flag = false;
  31. 	for (int i = 0; i <= s.size() - t.size(); i++) {
  32. 		if (s[i] == t[0] && s[i + t.size() - 1] == t[t.size() - 1]) {
  33. 			int h1 = hashing(p, s, i, i + t.size() - 1);
  34. 			if (h1 == h2) {
  35. 				cout << i;
  36. 				flag = true;
  37. 				break;
  38. 			}
  39. 		}
  40. 	}
  41. 	if (!flag)
  42. 		cout << -1;
  43. }
Success #stdin #stdout 0.01s 5328KB
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https://ideone.com/tzSelP
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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