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  1. #include <iostream>
  2.  
  3. char foo(const std::string& s, std::size_t index)
  4. {
  5.     auto size = s.size();
  6.  
  7.     while (size <= index) {
  8.         size *= 2;
  9.     }
  10.     while (size != s.size()) {
  11.         size /= 2;
  12.         if (index >= size) {
  13.             index = (index - 1) % size;
  14.         }
  15.     }
  16.     return s[index];
  17. }
  18.  
  19. int main()
  20. {
  21.     for (int i = 0; i != 12; ++i) {
  22.         std::cout << foo("COW", i);
  23.     }
  24. }
  25.  
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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COWWCOOCOWWC
https://ideone.com/LBvloF
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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