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  1. #include<iostream>
  2. #include<string>
  3. #include<map>
  4. #include<vector>
  5. #include<queue>
  6. #include<stack>
  7. #include<set>
  8. #include<algorithm>
  9. #include<sstream>
  10. #include<limits.h>
  11. #include<iomanip>
  12. #include<cstring>
  13. #include<bitset>
  14. #include<fstream>
  15. #include<cmath>
  16. #include<cassert>
  17. #include <stdio.h>
  18. #include<ctype.h>
  19. using namespace std;
  20. vector <int> ZFunction(string &str) {
  21.     vector <int> Z(str.size(), 0);
  22.     int L = 0, R = 0;
  23. 	for(int i = 1; i < str.size(); ++ i) {
  24.         if (i > R || Z[i - L] >= R - i + 1) {
  25.             L = i; R = max(i, R);
  26.             while (R < str.size() && str[R - L] == str[R]) R ++;
  27.             Z[i] = (R --) - L;
  28.         } else
  29. 			Z[i] = Z[i - L];
  30.     }
  31. 	Z[0] = str.size();
  32. 	return Z;
  33. }
  34. int thirdPattern(vector<int> &Z) {
  35. 	int res = 0;
  36. 	for(int i = 1; i < Z.size(); ++ i)
  37. 		if(Z[i] >= i && i * 2 < Z.size())
  38. 			res ++;
  39. 	return res;
  40. }
  41. int secondPattern(vector<int> &Z) {
  42. 	int res = 0;
  43. 	for(int i = 1; i < Z.size(); ++ i)
  44. 		if(Z[i] + i == Z.size() && Z[i] * 2 < Z.size())
  45. 			res ++;
  46. 	return res;
  47. }
  48.  
  49. int main() {
  50. //	freopen("input.txt","r",stdin);
  51. 	string str, rev;
  52. 	while(cin >> str) {
  53.  
  54. 		rev = str;
  55. 		reverse(rev.begin(), rev.end());
  56.  
  57. 		vector<int> Z = ZFunction(str);
  58. 		vector<int> Z_rev = ZFunction(rev);
  59.  
  60. 		int res = thirdPattern(Z_rev);
  61. 		res += secondPattern(Z);
  62. 		res += thirdPattern(Z);
  63.  
  64. 		cout << res << endl;
  65. 	}
  66. }
Success #stdin #stdout 0s 3144KB
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https://ideone.com/56TILb
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
secret

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