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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. void spaces(char space) {
  5. 	if (space <= 0) {
  6. 		return;
  7. 	}
  8. 	std::cout << " ";
  9. 	spaces(space-1);
  10. }
  11.  
  12. void line(char start, char end, char space) {
  13. 	if (start != end) {
  14. 		std::cout << start;
  15. 		line(start+1, end, space-1);
  16. 		std::cout << start;
  17. 	} else {
  18. 		std::cout << end;
  19. 	}
  20. }
  21.  
  22. void countdown(char start, char end, char space) {
  23. 	++space;
  24. 	if (start != end) {
  25. 		countdown(start, end-1, space);
  26. 	}
  27. 	spaces(space);
  28. 	line(start, end, space);
  29.     spaces(space);
  30. 	std::cout << std::endl;
  31. }
  32.  
  33. void range(char start, char end) {
  34. 	countdown(start, end, 0);
  35. }
  36.  
  37. int main() {
  38. 	range('a', 'g');
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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       a       
      aba      
     abcba     
    abcdcba    
   abcdedcba   
  abcdefedcba  
 abcdefgfedcba
https://ideone.com/bwj85Z
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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