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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n , ans=0 , freq[27]; 
  6. 	cin>>n ; 
  7. 	string s; 
  8. 	cin>>s ;
  9. 	if ( n >26 )
  10. 		cout<<"-1"<<endl; 
  11. 	else { 
  12. 		for (int i=0 ;i<n ;i++ )
  13. 			freq[s[i]-'a' ]++;
  14.  
  15. 		for ( int j=0 ;j<26 ;j++){
  16. 			if (freq[j] >1 ){
  17. 				ans+=freq[s[j]]-1 ; 
  18. 			}
  19. 		}
  20. 	}
  21. 	cout<<ans <<endl; 
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/Qz4ttj
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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