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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. bool increment(std::vector<std::size_t>& v, std::size_t maxSize)
  5. {
  6.     for (auto it = v.rbegin(); it != v.rend(); ++it) {
  7.         ++*it;
  8.         if (*it != maxSize) {
  9.             return true;
  10.         }
  11.         *it = 0;
  12.     }
  13.     return false;
  14. }
  15.  
  16. void print(const std::vector<int>&v, const std::vector<std::size_t>& indexes)
  17. {
  18.     const char* sep = "";
  19.     for (auto index : indexes) {
  20.         std::cout << sep << v[index];
  21.         sep = ".";
  22.     }
  23.     std::cout << std::endl;
  24. }
  25.  
  26. void print_cartesian_product(const std::vector<int>&v, int n)
  27. {
  28.     std::vector<std::size_t> indexes(n);
  29.  
  30.     do {
  31.         print(v, indexes);
  32.     } while (increment(indexes, v.size()));
  33.  
  34. }
  35.  
  36. int main()
  37. {
  38.     print_cartesian_product({4, 8, 42}, 3);
  39. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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4.4.4
4.4.8
4.4.42
4.8.4
4.8.8
4.8.42
4.42.4
4.42.8
4.42.42
8.4.4
8.4.8
8.4.42
8.8.4
8.8.8
8.8.42
8.42.4
8.42.8
8.42.42
42.4.4
42.4.8
42.4.42
42.8.4
42.8.8
42.8.42
42.42.4
42.42.8
42.42.42
https://ideone.com/nmbslC
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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