fork(1) download 
  1. #include <iostream>
  2. #include <vector>
  3.  
  4. template <typename InIt1, typename InIt2>
  5. bool is_subsequence(InIt1 first1, InIt1 last1, InIt2 first2, InIt2 last2)
  6. {
  7.     if (first2 == last2) {
  8.         return false; // sub empty (should this return true?)
  9.     }
  10.     for (; first1 != last1; ++first1) {
  11.         if (*first1 == *first2) {
  12.             if (++first2 == last2) {
  13.                 return true; // sub exhausted
  14.             }
  15.         }
  16.     }
  17.     return false; // seq exhausted
  18. }
  19.  
  20. int main()
  21. {
  22.     std::vector<int> a = { 1, 2, 3, 4 }, b = { 2, 4 }, c = { 4, 2 };
  23.     std::vector<int> d = { 3, 6, 3, 1, 2, 3 }, e = { 3, 1, 3 };
  24.  
  25.     std::cout << is_subsequence(a.begin(), a.end(), b.begin(), b.end()) << '\n';
  26.     std::cout << is_subsequence(a.begin(), a.end(), c.begin(), c.end()) << '\n';
  27.     std::cout << is_subsequence(d.begin(), d.end(), e.begin(), e.end()) << '\n';
  28. }
  29.  
  30.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
1
0
1
https://ideone.com/RIYr5f
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!