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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	string s ;
  7. 	cin>>s;
  8. 	int k ; cin>>k;
  9. 	int n = s.size();
  10. 	int ans = 0 ; 
  11. 	for(int i = 0 ; i<n;i++){
  12. 		int count = 0 ; 
  13. 		for(int j = i;j<n;j++){
  14. 			if(s[j]=='5')count++;
  15. 			if(count==k) ans++;
  16. 		}
  17. 	}
  18.  
  19. 	cout<<ans;
  20. 	// your code goes here
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5328KB
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https://ideone.com/7jY0NL
language:
C++ (gcc 8.3)
created:
1 hour ago
visibility:
public

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