Question

(In C++) Write a function that returns the intersection of two vectors using the following header:

Answer 1

The common strings are Dallas Boston:

#include <iostream>
#include <vector>

using namespace std;

template<typename T>
vector<T> intersect(const vector<T>& v1, const vector<T>& v2) {
   vector<T> vec;
   for(int i = 0; i < v1.size(); ++i) {
       for(int j = 0; j < v2.size(); ++j) {
           if(v1[i] == v2[j]) {
               vec.push_back(v2[j]);
               break;
           }
       }
   }
   return vec;
}

int main() {
   vector<string> v1;
   v1.push_back("Atlanta");
   v1.push_back("Dallas");
   v1.push_back("Chicago");
   v1.push_back("Boston");
   v1.push_back("Denver");    

   vector<string> v2;
   v2.push_back("Dallas");
   v2.push_back("Tampa");
   v2.push_back("Miami");
   v2.push_back("Boston");
   v2.push_back("Richmond");    

   vector<string> v3 = intersect(v1, v2);
   cout << "The common strings are ";
   for(int i = 0; i < v3.size(); ++i) {
       cout << v3[i] << " ";
   }
   cout << endl;
   return 0;
}

What is string?
A string is typically a sequence of characters in computer programming, either as a literal constant as some sort of variable. The latter can either be fixed or its elements and length can be altered (after creation). A string is commonly implemented as just an array data structure comprising bytes (or words) that contains a sequence of elements, typically characters, using some character encoding. A string is generally thought of as a type of data. A string can also represent various sequence(or list) data types and structures, such as more complex arrays. A variable declared as a string may enable memory storage to be statically allocated for a set maximum length or utilise dynamic allocation that allow it to retain a variable number of elements, appropriate programming language and specific data type used.

To learn more about string
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