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  1. #include <iostream>
  2. #include <vector>
  3. //#include <string>
  4. #include <cmath>
  5.  
  6. int main(int argc, char* argv)
  7. {
  8. 	std::vector<std::string> signs;
  9. 	signs.push_back("a");
  10. 	signs.push_back("b");
  11.  
  12. 	size_t digits = 3;
  13. 	size_t num_variations = pow(signs.size(), digits);
  14.  
  15. 	std::vector<std::string> variations;
  16. 	variations.resize(num_variations * digits);
  17.  
  18. 	size_t sign_index = 0;
  19.  
  20. 	for (size_t column = 0; column < digits; ++column)
  21. 	{
  22. 		size_t row = 0;
  23.  
  24. 		for (size_t subindex1 = 0; subindex1 < pow(signs.size(), column + 1); ++subindex1)
  25. 		{
  26. 			for (size_t subindex2 = 0; subindex2 < pow(signs.size(), digits - (column + 1)); ++subindex2)
  27. 			{
  28. 				variations[digits * row + column] = signs[sign_index % signs.size()];
  29.  
  30. 				++row;
  31. 			}
  32.  
  33. 			++sign_index;	
  34. 		}
  35. 	}
  36.  
  37. 	size_t index = 0;
  38. 	for (size_t index_a = 0; index_a < num_variations; ++index_a)
  39. 	{
  40. 		for (size_t index_b = 0; index_b < digits; ++index_b)
  41. 		{
  42. 			std::cout << variations[index] << " ";
  43. 			++index;
  44. 		}
  45. 		std::cout << '\n';
  46. 	}
  47. }
Success #stdin #stdout 0s 4400KB
comments (?)
stdin 
Standard input is empty
stdout 
a a a 
a a b 
a b a 
a b b 
b a a 
b a b 
b b a 
b b b
https://ideone.com/QtcKFH
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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