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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4. #include <vector>
  5.  
  6. bool increase(const std::vector<std::string>& v, std::vector<std::size_t>& it)
  7. {
  8.     for (std::size_t i = 0, size = it.size(); i != size; ++i) {
  9.         const std::size_t index = size - 1 - i;
  10.         ++it[index];
  11.         if (it[index] == v[index].size()) {
  12.             it[index] = 0;
  13.         } else {
  14.             return true;
  15.         }
  16.     }
  17.     return false;
  18. }
  19.  
  20. void do_job(const std::vector<std::string>& v, std::vector<std::size_t>& it)
  21. {
  22.     for (std::size_t i = 0, size = v.size(); i != size; ++i) {
  23.         std::cout << v[i][it[i]];
  24.     }
  25.     std::cout << std::endl;
  26. }
  27.  
  28. void iterate(const std::vector<std::string>& v)
  29. {
  30.     std::vector<std::size_t> it(v.size(), 0);
  31.  
  32.     do {
  33.         do_job(v, it);
  34.     } while (increase(v, it));
  35. }
  36.  
  37. int main()
  38. {
  39.     const std::map<int, std::string> m = {
  40.         {0, "*"}, {1, "#"  }, {2, "ABC"},
  41.         {3, "DEF"}, {4, "GHI"}, {5, "JKL"},
  42.         {6, "MNO"}, {7, "PQR"}, {8, "STU"},
  43.         {9, "VWXYZ"}
  44.     };
  45.     const std::vector<int> numbers = {0, 2, 3};
  46.     std::vector<std::string> v;
  47.     for (auto n : numbers) {
  48.         v.push_back(m.at(n));
  49.     }
  50.     iterate(v);
  51.     return 0;
  52. }
  53.  
Success #stdin #stdout 0s 3480KB
comments (?)
stdin
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Standard input is empty
stdout
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*AD
*AE
*AF
*BD
*BE
*BF
*CD
*CE
*CF
https://ideone.com/vU4jL5
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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