- #include <cstdio> 
- #include <string> 
-   
- using namespace std; 
-   
- int main() { 
- 	const string str("atgctgttg"); 
- 	const int n = 5; // Assumed positive number smaller than str.size() 
- 	const int n1 = n - 1; 
-   
- 	for (auto i = str.cbegin(); i != str.cend() - n1; ++i) { 
- 		printf("%.*s\n", n, &*i); 
- 	} 
- } 
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