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  1.  
  2. class Node {
  3. public:
  4.     Node * next = nullptr;
  5. };
  6.  
  7. template<class TIter>
  8. TIter find(TIter begin) {
  9.     auto fast = begin;
  10.     auto slow = begin;
  11.  
  12.     for (;;) {
  13.         fast = fast->next;
  14.         if (!fast) break;
  15.         fast = fast->next;
  16.         if (!fast) break;
  17.         slow = slow->next;
  18.     }
  19.  
  20.     return slow;
  21. }
  22.  
  23. int main() {
  24.     Node single;
  25.     auto result = find(&single);
  26.     return 0;
  27. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/YfqQIg
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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