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  1. #include <bits/stdc++.h> 
  2.  
  3. using namespace std;  
  4.  
  5. typedef long long ll;  
  6. typedef pair<int, int> ii;  
  7.  
  8. const int INF = 1e9;  
  9. const ll LINF = 1e18;  
  10.  
  11. const int p = 31;  
  12. const int MOD = 1e9 + 9277;  
  13. const int N = 1e6 + 5; 
  14.  
  15. int n; 
  16. string s; 
  17.  
  18. int p_pow[N], h[N]; 
  19.  
  20. void precompute() {
  21. 	p_pow[0] = 1; 
  22. 	for (int i = 1; i <= n; i++) {
  23. 		p_pow[i] = 1ll * p_pow[i - 1] * p % MOD; 
  24. 	}
  25.  
  26. 	for (int i = 1; i <= n; i++) {
  27. 		h[i] = (1ll * h[i - 1] * p + (s[i] - 'a' + 1)) % MOD;  
  28. 	}
  29. }
  30.  
  31. int getHash(int l, int r) {
  32. 	return (h[r] - 1ll * h[l - 1] * p_pow[r - l + 1] % MOD + MOD) % MOD; 
  33. }
  34.  
  35. int main() {
  36. 	ios::sync_with_stdio(false); 
  37. 	cin.tie(nullptr); 	
  38. 	cin >> s; 
  39. 	n = s.size(); 
  40. 	s = ' ' + s; 
  41.  
  42. 	precompute();  
  43.  
  44. 	for (int len = 1; len <= n; len++) {
  45. 		if (getHash(1, n - len) == getHash(1 + len, n)) {
  46. 			cout << len << ' ';  
  47. 		}
  48. 	}
  49. }
Success #stdin #stdout 0s 5572KB
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stdin
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abcabca
stdout
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3 6 7
https://ideone.com/QJpTK8
language:
C++14 (gcc 8.3)
created:
338 days ago
visibility:
secret

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